Interstate 25
Interstate 25 (I-25) is a major north–south Interstate Highway in the western United States that extends 1,060.97 miles (1,707.79 km) from an interchange with Interstate 10 in Las Cruces, New Mexico, to an interchange with Interstate 90 in Buffalo, Wyoming.[1][2][3] The route traverses three states—New Mexico for 462.12 miles (743.96 km), Colorado for 298.60 miles (480.61 km), and Wyoming for 300.25 miles (483.22 km)—primarily following the eastern front of the Rocky Mountains and serving as the principal north-south corridor through the region.[1] I-25 connects key urban areas, including Las Cruces and Albuquerque in New Mexico; Pueblo, Colorado Springs, and Denver in Colorado; and Cheyenne and Casper in Wyoming.[1] It passes near the state capitals of Santa Fe, New Mexico; Denver, Colorado; and Cheyenne, Wyoming, facilitating interstate travel along the densely populated Front Range.[4] As the only Interstate highway running north-south through Colorado, I-25 supports critical commercial freight movement, tourism to Rocky Mountain destinations, and daily commuting in one of the fastest-growing corridors in the country.[5] The highway's completion in Colorado occurred on September 21, 1969, after construction that spanned over a decade and cost $125 million.[5]Route description
New Mexico
Interstate 25 in New Mexico spans approximately 462 miles from its southern terminus at Interstate 10 in Las Cruces to the Colorado state line north of Raton, with exits numbered sequentially from 0 to 460 based on mileposts.[6] I-25 begins at a major interchange with I-10 in Las Cruces, heading north through rural desert areas, passing near White Sands Missile Range and Elephant Butte Lake State Park. It traverses the Rio Grande Valley, serving Socorro and Belen before entering the urban Albuquerque metropolitan area, where it crosses I-40 at the Big I interchange. North of Albuquerque, the route passes through Bernalillo and several Pueblo lands, then climbs toward Santa Fe, the state capital, via a bypass (NM 599). Continuing northeast, it goes through Las Vegas and Raton, ascending Raton Pass to the state line. The highway follows the historic Santa Fe Trail corridor in parts, with increasing elevation and mountainous terrain near the end. The following table lists all exits along I-25 in New Mexico, compiled from northbound configurations (which generally apply bidirectionally unless noted), including exit numbers, approximate mile markers where available, primary destinations served, and brief notes on significance such as services, restrictions, or traffic volume.| Exit | Mile | Destinations (Northbound/Southbound) | Notes |
|---|---|---|---|
| 0 | 0 | I-10 E/W – Las Cruces, Deming, El Paso TX | Southern terminus; major interstate junction.[6] |
| 1 | 1 | NM 292 – University Ave, Las Cruces | Access to New Mexico State University; key local entry.[6] |
| 3 | 3 | Lohman Ave – Las Cruces | Commercial area with fuel and food services.[6] |
| 6 | 6 | US 70 E – Alamogordo, Del Rey Blvd | Eastward connection to White Sands Missile Range.[6] |
| 9 | 9 | NM 320 – Dona Ana | Rural access; limited services.[6] |
| 19 | 19 | Radium Springs | Scenic area near Rio Grande; rest area nearby.[6] |
| 32 | 32 | County Road E071 – Rincon | Truck turnout available.[6] |
| 35 | 35 | NM 140 – Hatch, Rincon | Agricultural region; US Border Patrol checkpoint.[6] |
| 41 | 41 | NM 26 W – Hatch | Local town access.[6] |
| 51 | 51 | NM 546 – Garfield, Salem | Rural farming area.[6] |
| 59 | 59 | NM 187 – Caballo, Percha State Parks | Access to Elephant Butte Lake recreation.[6] |
| 63 | 63 | NM 152 – Hillsboro | Connection to mining historic sites.[6] |
| 71 | 71 | Las Palomas | Limited rural access.[6] |
| 75 | 75 | Williamsburg, Truth or Consequences | Business loop entry.[6] |
| 79 | 79 | I-25 BUS – Truth or Consequences | Town center; US Border Patrol checkpoint.[6] |
| 83 | 83 | Elephant Butte Lake State Park | Major recreation area.[6] |
| 89 | 89 | Martin Ranch Rd – Truth or Consequences | Local ranch access.[6] |
| 92 | 92 | Mitchell Point | Scenic overlook.[6] |
| 100 | 100 | Red Rock | State park access.[6] |
| 115 | 115 | SR 107 – San Antonio, Camino Real International Heritage Center | Historic trail site; rest area at mile 114.[6] |
| 124 | 124 | SR 178 – Willow Springs Ranch Rd | Rural.[6] |
| 139 | 139 | US 380 E – San Antonio, Carrizozo | East-west connector.[6] |
| 147 | 147 | US 60 W – Socorro, Magdalena | Major east-west route.[6] |
| 150 | 150 | US 60 W, I-25 BUS W – Socorro | Business loop.[6] |
| 152 | 152 | Escondida | Local access.[6] |
| 156 | 156 | NM 408 – Lemitar | Rural.[6] |
| 163 | 163 | San Acacia | Rest area.[6] |
| 175 | 175 | US 60 E – Bernardo, Mountainair | Eastward to Salinas Pueblo Missions.[6] |
| 190 | 190 | I-25 BUS – Belen | South Belen access.[6] |
| 191 | 191 | Camino Del Llano – Belen | Local.[6] |
| 195 | 195 | Belen | Main town entry.[6] |
| 203 | 203 | NM 6 – Los Lunas | Connection to historic Route 66.[6] |
| 209 | 209 | NM 317, NM 314, NM 45 – Isleta Pueblo | Pueblo lands; high ADT approaching Albuquerque.[6] |
| 213 | 213 | NM 314 – Isleta Blvd | Pueblo access.[6] |
| 215 | 215 | NM 47 – Albuquerque | Rio Grande crossing; ADT exceeds 150,000 vehicles daily in urban core.[6] |
| 220 | 220 | NM 500 – Rio Bravo Blvd | South Albuquerque industrial.[6] |
| 221 | 221 | Sunport Blvd – Albuquerque International Sunport | Major airport; ADT around 204,000 in metro area.[6] |
| 222 | 222 | Gibson Blvd – Kirtland AFB | Military base; HOV lane evaluations in corridor.[6][7] |
| 223 | 223 | Avenida Cesar Chavez – Albuquerque | University district.[6] |
| 224 | 224 | Coal Ave, Lead Ave, Central Ave – Albuquerque | Downtown access; high urban traffic.[6] |
| 225 | 225 | Lomas Blvd, Menaul Blvd, Candelaria Rd – Albuquerque | Central city; ADT peaks at 204,000.[6] |
| 226 | 226 | I-40 E/W – Albuquerque | Major junction with transcontinental interstate; Big I interchange.[6] |
| 227 | 227 | Comanche Rd, Griegos Rd – Albuquerque | North valley.[6] |
| 228 | 228 | Montgomery Blvd, Montano Rd – Albuquerque | Commercial corridor.[6] |
| 229 | 229 | Jefferson St – Albuquerque | Local.[6] |
| 230 | 230 | San Mateo Blvd, Osuna Rd – Albuquerque | Shopping areas.[6] |
| 231 | 231 | Pan American Frontage Rd NB | Frontage road access.[6] |
| 232 | 232 | NM 423 – Paseo del Norte – Albuquerque | Northern suburbs.[6] |
| 233 | 233 | Alameda Blvd, NM 528 – Albuquerque | Rio Grande access.[6] |
| 234 | 234 | NM 556, Tramway Rd, Roy Ave – Albuquerque | Foothills entry.[6] |
| 240 | 240 | NM 473 – Bernalillo | Town center.[6] |
| 242 | 242 | NM 165 E, US 550 W – Placitas, Bernalillo | Jemez Mountains access.[6] |
| 248 | 248 | NM 315 – Algodones | Local.[6] |
| 252 | 252 | San Felipe Pueblo | Tribal lands.[6] |
| 257 | 257 | Budaghers | Rest area.[6] |
| 259 | 259 | NM 22 – Santo Domingo Pueblo | Pueblo access.[6] |
| 264 | 264 | NM 16 – Cochiti Pueblo | Historic sites.[6] |
| 267 | 267 | Waldo, Canyon Rd – Santa Fe | Southern approach to capital.[6] |
| 271 | 271 | La Cienega, FM 50 | Local.[6] |
| 276 | 276 | NM 599 S – Madrid | Santa Fe bypass.[6] |
| 278 | 278 | NM 14 S/N – Madrid, Cerrillos Rd – Santa Fe | Turquoise Trail; city entry.[6] |
| 282A/B | 282 | US 84 N, US 285 N – St. Francis Dr, Santa Fe Plaza | Northern terminus of concurrency; tourist hub.[6] |
| 284 | 284 | NM 466 – Old Pecos Trail – Santa Fe | Historic route.[6] |
| 290 | 290 | US 285 S – Clines Corners | Southward to I-40.[6] |
| 294 | 294 | Sleeping Dog Rd | Rural.[6] |
| 299 | 299 | NM 50 – Glorieta, Pecos | Glorieta Pass historic battle site.[6] |
| 307 | 307 | NM 63, NM 50 – Rowe, Pecos | Local towns.[6] |
| 319 | 319 | San Juan, San Jose | Rural.[6] |
| 323 | 323 | NM 3 S – Villanueva | Scenic byway.[6] |
| 330 | 330 | Bernal | Local.[6] |
| 339 | 339 | US 84 S – Romeroville, Santa Rosa | West to I-40.[6] |
| 343 | 343 | NM 283, I-25 BUS, NM 329 – Las Vegas | Town entry.[6] |
| 345 | 345 | NM 65, NM 104 – Las Vegas, University Ave | Fort Union National Monument access.[6] |
| 347 | 347 | I-25 Business, NM 250 – Las Vegas | Business loop.[6] |
| 352 | 352 | Airport – Las Vegas | Municipal airport.[6] |
| 356 | 356 | Onava – Las Vegas | Local.[6] |
| 361 | 361 | Unnamed rural exit | Rural.[6] |
| 364 | 364 | NM 161, NM 97 – Valmora, Watrous | Local.[6] |
| 366 | 366 | NM 161, NM 97 – Watrous, Valmora | Duplicate access.[6] |
| 387 | 387 | NM 120 – Wagon Mound | East-west connector.[6] |
| 393 | 393 | Levy | Rural.[6] |
| 404 | 404 | NM 569 – Colmor, Miami | Local.[6] |
| 412 | 412 | I-25 Business – Springer | Town loop.[6] |
| 414 | 414 | Springer | Main entry.[6] |
| 419 | 419 | NM 58 W – Cimarron | Philmont Scout Ranch access.[6] |
| 426 | 426 | NM 505 – Maxwell | National Wildlife Refuge.[6] |
| 435 | 435 | Tinaja – Raton | Rural.[6] |
| 446 | 446 | US 64 W – Taos | Connection to Sangre de Cristo Mountains.[6] |
| 450 | 450 | I-25 Business – Raton | South Raton.[6] |
| 451 | 451 | US 64 E, US 87 E – Clayton, Raton | Eastern plains; truck port of entry nearby at mile 460.[6][8] |
| 452 | 452 | NM 72 E – Folsom, Raton | Capulin Volcano access.[6] |
| 454 | 454 | I-25 BUS, 2nd St – Raton | Downtown Raton.[6] |
| 460 | 460 | Colorado State Line | Northern terminus; Raton Pass elevation 7,834 ft; seasonal truck chain requirements possible.[6][8] |
Colorado
Interstate 25 in Colorado features approximately 120 exits over its 298.87-mile length, from mile 0 at the New Mexico state line near Trinidad to mile 299 at the Wyoming state line north of Fort Collins. The interchanges vary significantly, with rural sections south of Pueblo and north of Fort Collins exhibiting longer gaps between exits—often 10-20 miles—characterized by simple diamond or partial cloverleaf designs to accommodate lower traffic volumes and mountainous terrain. In contrast, the urban Front Range corridor from Pueblo to Fort Collins includes denser clustering of exits, with complex multi-level stack interchanges in major cities like Denver and Colorado Springs to handle high congestion; average daily traffic (ADT) reaches peaks exceeding 250,000 vehicles in the Denver metro area, necessitating innovations like managed express lanes and advanced interchange geometries.[9][10][11] I-25 enters Colorado over Raton Pass near Trinidad, passing through Walsenburg and Pueblo along the Front Range. It serves Colorado Springs with access to military bases like Fort Carson and the Air Force Academy, then continues north through Monument, Castle Rock, and the Denver suburbs, including the complex Mousetrap interchange with I-70. Beyond Denver, it traverses Westminster, Broomfield, and the northern suburbs to Fort Collins, connecting to rural areas in Larimer County before crossing into Wyoming. Key highlights among these exits include Exit 2 near Trinidad, a diamond interchange serving CO 12 and local access to the historic town; Exit 214, the Mousetrap—a five-level stack interchange with I-70 in Denver, rebuilt multiple times for seismic resilience and traffic efficiency following a 1984 structural incident; Exit 147 in Colorado Springs, a partial cloverleaf with US 24 (Cimarron Street) providing access to downtown and military installations; and Exit 240 in Fort Collins, a trumpet-style interchange with US 287 (College Avenue), facilitating connectivity to Colorado State University and northern rural areas. Special notes on modern enhancements include diverging diamond interchanges (DDIs) introduced in the 2010s to reduce conflict points and delay, such as the one at Exit 100 with US 50 in Pueblo (under construction, expected completion 2027) and at the Powers Boulevard/Airport Road surface intersection in Colorado Springs (ongoing as of 2025); additionally, reversible express lanes operate between Exits 207 (US 36) and 216 (downtown Denver), dynamically pricing tolls to optimize flow on segments with ADT over 200,000. The T-REX project in the early 2000s affected several Denver-area exits like 200 (I-225) by integrating light rail, while terrain influences spacing, with fewer exits in the hilly Raton Pass region compared to the flat plains north of Denver.[12][13][14][11][15] The following table enumerates all exits, including number, approximate milepost, primary destinations/locations, and interchange type where documented (based on CDOT design standards favoring diamonds in rural areas and more complex forms urbanely).[16]| Exit | Mile | Locations | Type |
|---|---|---|---|
| - | 0.00 | New Mexico state line (near Raton Pass) | - |
| 1 | 0.5 | County Road GG.5 – Starkville | Diamond |
| 2 | 2.0 | CO 12 – Trinidad, Cokedale | Diamond |
| 3 | 3.5 | CO 12 – Trinidad (northbound) | Partial diamond |
| 4 | 4.0 | Washington Street – Trinidad | Diamond |
| 5 | 5.5 | CO 71 – Starkville, Aguilar | Diamond |
| 11 | 11.0 | CO 10 – Ludlow, Trinidad State Park | Diamond |
| 12 | 12.0 | County Road 31.5 – Ludlow | Partial diamond |
| 15 | 15.0 | County Road 41.5 – Gulnare | Diamond |
| 20 | 20.0 | US 350 – Starkville, Weston | Diamond |
| 25 | 25.0 | County Road 61.5 – Tercio | Partial diamond |
| 27 | 27.0 | CO 12 – Hoehne, Madrid | Diamond |
| 32 | 32.0 | County Road 70.8 – Rincon | Diamond |
| 37 | 37.0 | County Road FF – Aguilar vicinity | Partial diamond |
| 42 | 42.0 | CO 69 – Aguilar | Diamond |
| 47 | 47.0 | County Road 41 – Walsenburg | Diamond |
| 52 | 52.0 | I-25 Frontage Road – Walsenburg | Partial diamond |
| 56 | 56.0 | CO 69 – Walsenburg, Gardner | Diamond |
| 59 | 59.0 | US 160 – Walsenburg, Fort Garland | Cloverleaf |
| 62 | 62.0 | County Road EE.5 – Gardner vicinity | Diamond |
| 68 | 68.0 | CO 10 – La Veta, Walsenburg | Partial diamond |
| 72 | 72.0 | County Road 520 – South Spanish Peak area | Diamond |
| 78 | 78.0 | US 160 – Fort Garland, Alamosa | Diamond |
| 82 | 82.0 | County Road 21 – San Isabel National Forest | Partial diamond |
| 90 | 90.0 | CO 69 – Rye, Wetmore | Diamond |
| 94 | 94.0 | Pueblo Boulevard | Partial cloverleaf |
| 96 | 96.0 | US 50 Bus. – Pueblo | Diamond |
| 98 | 98.0 | CO 45 – Pueblo Boulevard | Partial diamond |
| 100 | 100.0 | US 50 – Pueblo (under construction, expected completion 2027) | Diverging diamond |
| 101 | 101.0 | US 50 W – Cañon City, CO 47 E – Pueblo | - |
| 102 | 102.0 | US 50 Bus. – Pueblo (Abilene Road) | Diamond |
| 104 | 104.0 | CO 96 – Pueblo | Cloverleaf |
| 108 | 108.0 | US 85 Bus. – Pueblo (Santa Fe Avenue) | Partial diamond |
| 110 | 110.0 | CO 47 – Pueblo Memorial Airport | Diamond |
| 114 | 114.0 | US 85/87 – Pueblo | Partial cloverleaf |
| 116 | 116.0 | CO 45 – Pueblo West | Diamond |
| 118 | 118.0 | US 85/87 – Penrose | Partial diamond |
| 123 | 123.0 | CO 115 – Florence, Penrose | Diamond |
| 125 | 125.0 | County Road 300 – Florence | Partial diamond |
| 129 | 129.0 | CO 120 – Florence | Diamond |
| 132 | 132.0 | CO 16, CO 21 – Mesa Ridge Parkway, Fountain | Diamond |
| 135 | 135.0 | CO 85 – Security-Widefield | Partial diamond |
| 138 | 138.0 | CO 16 – Stratmoor | Diamond |
| 140 | 140.0 | CO 85 – Fort Carson | Partial cloverleaf |
| 142 | 142.0 | CO 85 – Lake Avenue, Colorado Springs | Diamond |
| 144 | 144.0 | US 24 Bus. – Colorado Springs | Partial diamond |
| 145 | 145.0 | CO 85 – Academy Boulevard | Diamond |
| 146 | 146.0 | CO 85 – Platte Avenue | Partial diamond |
| 147 | 147.0 | US 24 – Cimarron Street, Colorado Springs | Partial cloverleaf |
| 148 | 148.0 | CO 85 – Nevada Avenue | Diamond |
| 149 | 149.0 | CO 85 – Tejon Street | Partial diamond |
| 150 | 150.0 | CO 85 – Union Boulevard | Diamond |
| 151 | 151.0 | CO 85 – Union Boulevard | Diamond |
| 152 | 152.0 | Woodmen Road | Partial cloverleaf |
| 153 | 153.0 | CO 21 – Powers Boulevard, Interquest Parkway | Diamond |
| 156 | 156.0 | CO 83 – Baptist Road, Monument | Partial diamond |
| 158 | 158.0 | CO 105 – Palmer Lake, Monument | Diamond |
| 161 | 161.0 | CO 105 – Monument | Partial cloverleaf |
| 163 | 163.0 | County Line Road – Black Forest | Diamond |
| 167 | 167.0 | CO 86 – Dakan Road | Partial diamond |
| 170 | 170.0 | CO 83 – Black Forest | Diamond |
| 172 | 172.0 | CO 21 – Black Forest Road | Partial diamond |
| 174 | 174.0 | CO 83 – Shoup Road | Diamond |
| 175 | 175.0 | CO 86 – Greenland | Partial cloverleaf |
| 178 | 178.0 | CO 83 – Palmer Lake | Diamond |
| 181 | 181.0 | US 85/CO 83 – Founders Parkway, Castle Rock | Partial diamond |
| 183 | 183.0 | US 85 – Castle Rock | Diamond |
| 184 | 184.0 | Castle Pines Parkway | Partial diamond |
| 185 | 185.0 | CO 86 – Castle Rock | Diamond |
| 188 | 188.0 | US 85 – Sedalia | Partial cloverleaf |
| 191 | 191.0 | CO 83 – Parker Road | Diamond |
| 194 | 194.0 | US 85 – Lone Tree | Partial diamond |
| 195 | 195.0 | CO 88 – Happy Canyon Road | Diamond |
| 197 | 197.0 | CO 88 – Highlands Ranch | Partial diamond |
| 199 | 199.0 | C-470 | Cloverleaf |
| 200 | 200.0 | I-225 – Aurora | Partial cloverleaf |
| 201 | 201.0 | US 285/SH 30 – Hampden Avenue | Diamond |
| 202 | 202.0 | US 85 – Santa Fe Drive | Partial diamond |
| 203 | 203.0 | CO 177 – Broadway | Diamond |
| 204 | 204.0 | US 285 – Hampden Avenue west | Partial diamond |
| 205A | 205.0 | US 285 north – Santa Fe Drive (northbound) | - |
| 205B | 205.5 | US 285 south – Santa Fe Drive (southbound) | - |
| 206 | 206.0 | CO 121 – Wadsworth Boulevard | Diamond |
| 207 | 207.0 | US 36 – Boulder Turnpike | Partial cloverleaf |
| 209 | 209.0 | 6th Avenue | Diamond |
| 210 | 210.0 | CO 119 – 58th Avenue | Partial diamond |
| 211A | 211.0 | I-70 east – Limon (northbound) | Stack (part of Mousetrap) |
| 211B | 211.5 | I-70 west – Denver (southbound) | Stack (part of Mousetrap) |
| 212 | 212.0 | 23rd/20th Avenue | Partial diamond |
| 213 | 213.0 | CO 26 – Park Avenue West | Diamond |
| 214 | 214.0 | I-70/I-76 – Airport (Mousetrap) | Stack interchange |
| 215A | 215.0 | 20th Street – Downtown Denver | Partial diamond |
| 215B | 215.5 | CO 3 – Clay Street | - |
| 216 | 216.0 | US 6/US 85 – 6th Avenue | Diamond |
| 217 | 217.0 | 46th/48th Avenue | Partial diamond |
| 218 | 218.0 | SH 7 – 56th/58th Avenue | Diamond |
| 220 | 220.0 | 88th Avenue | Partial cloverleaf |
| 222 | 222.0 | 104th Avenue | Diamond |
| 223 | 223.0 | 120th Avenue – Westminster | Partial diamond |
| 225 | 225.0 | 144th Avenue | Diamond |
| 226 | 226.0 | 160th Avenue – Thornton | Partial diamond |
| 228 | 228.0 | Broomfield | Diamond |
| 229 | 229.0 | US 36 – Boulder | Partial cloverleaf |
| 232 | 232.0 | 104th Avenue | Diamond |
| 235 | 235.0 | CO 7 – Lafayette | Partial diamond |
| 240 | 240.0 | US 287 – Fort Collins | Trumpet |
| 243 | 243.0 | CO 14 – Fort Collins | Diamond |
| 250 | 250.0 | CO 60 – Milliken | Partial diamond |
| 255 | 255.0 | US 34 – Loveland | Cloverleaf |
| 257 | 257.0 | CO 402 – Loveland | Diamond |
| 262 | 262.0 | CO 1 – Berthoud | Partial diamond |
| 267 | 267.0 | CO 56 – Berthoud | Diamond |
| 270 | 270.0 | CO 66 – Longmont | Partial cloverleaf |
| 275 | 275.0 | CO 119 – Longmont | Diamond |
| 280 | 280.0 | US 287 – Longmont | Partial diamond |
| 285 | 285.0 | CO 66 – Platteville | Diamond |
| 290 | 290.0 | CO 14 – Ault | Partial diamond |
| 295 | 295.0 | County Road 74 – Pierce | Diamond |
| 299 | 299.00 | Wyoming state line | - |
Wyoming
Interstate 25 enters Wyoming at milepost 0 from the Colorado state line south of Cheyenne and extends 300.53 miles north to its junction with Interstate 90 in Buffalo, featuring approximately 50 exits that connect to local highways, business routes, and energy-related infrastructure in the Powder River Basin.[17] The route supports lower average daily traffic volumes of 40,000 to 80,000 vehicles compared to urban segments in Colorado, reflecting its rural character, with partial cloverleaf or diamond interchanges in remote areas providing limited access to former U.S. Route 87 alignments and ranch roads.[18] Weigh stations near Casper at mileposts 188 and 189 monitor heavy truck traffic from oil and coal transport corridors.[19] In Wyoming, I-25 follows the Front Range from Cheyenne northward through Wheatland and Douglas, entering the Powder River Basin near Casper. It passes Glendo State Park and rural energy areas before reaching Buffalo, where it meets I-90, providing access to the Bighorn Mountains and eastern plains. Key connections include Exit 7 to Interstate 80 west of Cheyenne for regional freight, Exit 96 to Wyoming Highway 59 north toward Douglas and Gillette's energy fields, Exit 194 serving Casper's industrial areas via local roads, and the northern terminus at Exit 301 linking to Interstate 90 for access to the Bighorn Mountains.[17] These exits facilitate movement along the historic Cheyenne-Buffalo stagecoach route, now overlaid by I-25, with notes on services like fuel and lodging concentrated near urban centers such as Cheyenne, Wheatland, Casper, and Buffalo.[20]| Exit | Milepost | Destinations | Notes |
|---|---|---|---|
| - | 0.000 | Colorado State Line | Southern terminus in Wyoming; Laramie County. Former US 85 alignment.[17] |
| 2 | 2.3 | WY 223 – Terry Ranch Road | Partial access; rural ranch road east of Cheyenne.[20] |
| 4 | 4.1 | High Plains Road | Local access near Cheyenne; no major services.[20] |
| 7 | 7.2 | I-80 / US 30 – College Drive / I-25 Bus. | Major interchange for Cheyenne; west to Laramie, east to Sidney, NE. Fuel, food, lodging.[17] |
| 9 | 9.0 | US 30 West – Lincolnway | Access to downtown Cheyenne; commercial district.[20] |
| 10 | 10.4 | Missile Drive | Military and industrial access near F.E. Warren AFB.[20] |
| 11 | 11.2 | Randall Avenue / Pershing Boulevard | Residential and commercial in Cheyenne. Pharmacies, shopping.[20] |
| 12 | 12.1 | Central Avenue / I-25 Bus. / US 85 South | Partial interchange; connects to historic US 85. Fuel, food.[17] |
| 13 | 13.0 | Vandehei Avenue | Northern Cheyenne access; shopping, pets services.[20] |
| 16 | 16.3 | WY 211 – Horse Creek Road | Rural exit west to Horse Creek; limited services.[20] |
| 17 | 17.1 | US 85 North – Torrington | Cloverleaf; north to Fort Laramie historic site.[17] |
| 21 | 21.4 | Ridley Road | Agricultural access; no services detected.[20] |
| 25 | 25.0 | Unmarked (local road) | Partial access near Pine Bluffs; former alignment.[20] |
| 29 | 29.5 | Whitaker Road | Rural; connects to WY 215 east.[17] |
| 34 | 34.4 | Nimmo Road | Local ranch road; no services.[20] |
| 39 | 39.2 | Little Bear Road | Partial interchange; Bear Creek area.[17] |
| 47 | 47.0 | Bear Creek Road / Laramie CR 245 | Platte County line nearby; rural.[17] |
| 54 | 54.0 | I-25 Bus. – Chugwater | Business loop access; food available.[20] |
| 57 | 57.3 | I-25 Bus. (16th Street) | Chugwater services; former US 87.[17] |
| 65 | 65.1 | Slater Road | Rural partial access.[20] |
| 66 | 66.0 | Hunton Road | Near Wheatland; agricultural.[20] |
| 68 | 68.2 | Antelope Road | Local road; no services.[20] |
| 70 | 70.4 | Bordeaux Road | Access to Laramie River; partial.[20] |
| 73 | 73.1 | WY 34 West – Laramie / Wheatland | West to Guernsey Reservoir; fuel.[17] |
| 78 | 78.0 | I-25 Bus. / US 87 Bus. – 16th Street | Wheatland business district; lodging.[20] |
| 80 | 80.2 | US 87 North – Wheatland | Commercial access; food, shopping.[17] |
| 84 | 84.0 | West Laramie River Road | Rural; river access.[20] |
| 92 | 92.3 | US 26 East – Guernsey / Torrington | East to Fort Laramie; partial interchange.[17] |
| 94 | 94.1 | El Rancho Road | Local; no services.[20] |
| 96 | 96.0 | WY 59 – Douglas / Gillette | Major energy corridor north; fuel, truck services. Coal and oil transport.[17] |
| 100 | 100.2 | Cassa Road | Near Glendo Reservoir; recreational.[20] |
| 104 | 104.0 | Glendo State Park | East to park; camping, outdoors.[20] |
| 111 | 111.3 | Glendo | Local access; food.[20] |
| 126 | 126.0 | US 18 / US 20 East – Lusk | East to Nebraska; diamond interchange.[17] |
| 135 | 135.2 | I-25 Bus. – Douglas | Business loop; Douglas services.[20] |
| 140 | 140.0 | WY 59 – Douglas / Gillette | South end of WY 59; energy hub. Truck parking.[17] |
| 146 | 146.1 | WY 96 – Douglas | Local highway east.[20] |
| 151 | 151.0 | Ayres Natural Bridge | West to park; recreational access.[20] |
| 165 | 165.3 | Glenrock / Rolling Hills | Glenrock access; fuel, food.[20] |
| 172 | 172.0 | Salt Creek Road | Rural; Converse County.[17] |
| 182 | 182.0 | Hat Six Road / Brooks Road | North to Evansville; partial. Weigh station nearby.[17] |
| 185 | 185.0 | Wyoming Boulevard – Evansville | South Casper; commercial.[20] |
| 186 | 186.2 | I-25 Bus. / US 20 / US 26 / US 87 Bus. – Beverly Street | Casper loop south; major services. Fuel, medical.[17] |
| 187 | 187.0 | McKinley Street | Downtown Casper access.[20] |
| 188A | 188.1 | Center Street | Casper central; shopping.[20] |
| 188B | 188.5 | WY 220 West – Poplar Street / Port of Entry | Weigh station; west to Alcova. Truck inspection.[17] |
| 189 | 189.0 | US 20 / US 26 West – Shoshoni | Partial; westbound port of entry.[20] |
| 191 | 191.6 | Wardwell Road | Industrial near Casper; energy facilities.[19] |
| 194 | 194.0 | I-25 Bus. – Casper | Business route to east Casper.[17] |
| 197 | 197.2 | Ormsby Road | Rural north of Casper.[20] |
| 210 | 210.0 | WY 259 – Horse Ranch Creek Road | Local access; no services.[20] |
| 216 | 216.3 | Alcova Road | Near Alcova Lake; recreational.[20] |
| 227 | 227.0 | WY 387 – Midwest / Edgerton | East to oil fields; truck route.[17] |
| 235 | 235.0 | Tisdale Mountain Road / WY 196 | Rural; partial access.[19] |
| 246 | 246.2 | Unmarked (local) | Near Kaycee; no services.[20] |
| 249 | 249.0 | WY 196 – Kaycee | Town access; fuel.[20] |
| 254 | 254.1 | Kaycee | Main street; food, lodging.[20] |
| 265 | 265.0 | Reno Road | Rural partial; ranch access.[20] |
| 291 | 291.3 | Trabing Road | Near Buffalo; local.[20] |
| 298 | 298.0 | I-25 Bus. / US 87 Bus. – Buffalo | Business loop; downtown access. Lodging.[17] |
| 299 | 299.2 | US 16 – Buffalo | East to Tensleep; commercial.[20] |
| 301 | 301.0 | I-90 – Buffalo | Northern terminus; east to Sheridan, west to Gillette. Major junction for energy and tourism.[17] |
History
Planning and designation
The planning and designation of Interstate 25 (I-25) emerged as part of the national Interstate Highway System established by the Federal-Aid Highway Act of 1956, which authorized the construction of approximately 41,000 miles of controlled-access highways to connect major population centers, borders, and ports across the United States.[21] This legislation, signed by President Dwight D. Eisenhower on June 29, 1956, envisioned a network that would facilitate interstate commerce, national defense, and rapid travel, with federal funding covering 90 percent of costs. I-25 was identified as a key north-south corridor in the western United States, linking the region near the Mexican border at Las Cruces, New Mexico, to the northern plains at Buffalo, Wyoming, thereby supporting economic ties between the Southwest and the Great Plains.[22] The route numbering for the Interstate system was finalized in 1957 by the Bureau of Public Roads (BPR, predecessor to the Federal Highway Administration) and the American Association of State Highway Officials (AASHO), following principles where odd numbers denoted north-south routes and even numbers east-west routes, with numbers generally increasing eastward for north-south highways and northward for east-west ones.[23] I-25 received its designation on August 14, 1957, as the third primary north-south route from the West Coast, positioned as a western parallel to the more central I-35 and reflecting the system's grid-like logic to ensure logical connectivity.[24] This numbering aligned with the route's role in serving the Rocky Mountain front range, from the international border vicinity to the Wyoming prairies. The highway earned the nickname "Pan-American Freeway" early in its conceptualization, inspired by visions of integrating it with the broader Pan-American Highway network to promote hemispheric trade and travel from Mexico northward.[5] Initial route planning for I-25 closely followed the established corridor of U.S. Route 85 (US 85), a pre-existing north-south highway that had been developed since the 1920s along the eastern edge of the Rocky Mountains, providing a logical alignment from Las Cruces northward through Albuquerque, Colorado Springs, Denver, and Cheyenne to the Wyoming state line, with extensions over Raton Pass and beyond into Wyoming.[25] The full route, spanning about 1,062 miles across New Mexico, Colorado, and Wyoming, received federal approval in 1957 as part of the phased designation of the Interstate system, building on preliminary mappings from the 1940s that prioritized connections to border areas and resource-rich regions.[22] Design standards mandated a minimum of four 12-foot lanes in a divided configuration, full control of access via interchanges, and geometric features supporting speeds up to 70 mph, with specific provisions for heavy truck traffic—including climbing lanes on grades—and adaptations for mountainous terrain such as wider shoulders and reinforced structures to handle snow, ice, and steep inclines. Early planning faced notable engineering controversies, particularly at Raton Pass on the Colorado-New Mexico border, where the existing US 85 alignment involved steep grades exceeding 6 percent over a 7,800-foot elevation, challenging the Interstate's uniform high-speed standards and requiring innovative cut-and-fill earthwork, retaining walls, and drainage systems to mitigate landslides and avalanches in the rugged Sangre de Cristo Mountains.[26] Alignment debates also arose near Albuquerque, New Mexico, where proposals to route the freeway through the city's densely populated North Valley sparked concerns over urban disruption, land acquisition from historic acequia-irrigated farmlands, and potential flooding risks from the Rio Grande, leading to revised alignments that balanced connectivity with local impacts during the late 1950s federal-state coordination.[25] These issues highlighted the tensions between national mobility goals and regional topography and community needs in finalizing the route.Construction phases
Construction of Interstate 25 began in the late 1950s following the Federal-Aid Highway Act of 1956, which authorized the Interstate Highway System and provided for its development across the three states it traverses. The project progressed in phases, with segments built concurrently in multiple locations to connect existing highways like U.S. Route 85, emphasizing efficient routing through mountainous and desert terrain. By the 1970s, most of the route was operational, though completion extended into the early 1980s due to funding delays and challenging geography. In New Mexico, initial construction started near Las Cruces in 1957 as part of the early Interstate build-out, linking to I-10 and extending northward through rural areas.[4] A key milestone was the opening of the "Big I" interchange in Albuquerque in 1966, a complex five-level stack interchange connecting I-25 with I-40 at a cost designed for 40,000 vehicles per day.[27] Progress continued northward, with the final segment over Raton Pass near the Colorado border completed in the mid-1970s, marking full continuity from Las Cruces to the state line. Colorado's portion advanced rapidly after designation, building on the pre-existing Valley Highway in Denver, where construction from 1948 to 1958 provided the foundational urban freeway segment.[26] The link between Pueblo and Denver was established in the early 1960s, with the Pueblo Freeway interchange completed by 1959 and extensions northward following soon after.[28] The route's southern end connected via a 21-mile segment south of Walsenburg in 1969, finalizing Colorado's 299-mile alignment at a total cost of $125 million.[5] Wyoming's build-out started with segments near Cheyenne in the late 1950s, including a 10.1-mile section awarded in 1956 and opened by 1960, integrating with I-80.[29] Mid-route progress from Casper toward Buffalo occurred through the 1960s, replacing older alignments with modern freeway standards.[29] The last major gap, a 26.5-mile stretch between Casper and Kaycee, opened on February 2, 1982, delayed by funding constraints and completing the state's 301-mile portion.[29] The entire Interstate 25 project relied heavily on federal funding, covering 90% of costs through the Highway Trust Fund, with states providing the remaining 10% match.[30] Adjusted for inflation, total expenditures exceeded $1 billion across the route, reflecting the scale of earthwork and infrastructure in varied landscapes. Engineering challenges included multiple bridges over the Rio Grande River, such as the mid-1960s Pan American crossing near Albuquerque, which navigated deep valleys with cantilever designs.[31] At Raton Pass, extensive grading along the historic U.S. 85 alignment achieved a 6% maximum grade without tunnels, minimizing costs while ensuring safe passage over the 7,800-foot elevation.[26]Major expansions
One of the most significant post-construction upgrades to Interstate 25 occurred in the Denver metropolitan area through the Transportation Expansion (T-REX) Project, completed between 2004 and 2006. This $1.67 billion initiative widened 17 miles of I-25 from Broadway to Lincoln Avenue, adding high-occupancy vehicle lanes, reconstructing interchanges, and integrating 19 miles of new light rail service along the Southeast Corridor to address growing congestion and multimodal needs.[12] The project, a pioneering design-build effort, also included environmental mitigations such as wetland restoration and noise barriers to minimize impacts on urban habitats.[32] In Colorado Springs, the Colorado Springs Metro Interstate Expansion (COSMIX) project from 2006 to 2007 focused on widening I-25 to three lanes in each direction over a 12-mile stretch south of the city, at a cost of $150 million. This effort rebuilt key interchanges at Santa Fe Avenue, Platte Avenue, and Circle Drive, improving traffic flow and safety amid rapid suburban growth.[33] It incorporated intelligent transportation systems for real-time monitoring and addressed capacity constraints for freight and commuter traffic.[34] More recent Colorado projects include the 2024 update to the South I-25 Corridor Study, which examines urban planning needs from C-470 to the Douglas County line, emphasizing multimodal enhancements like transit-oriented development, bike/pedestrian facilities, and equity-focused access in southern Denver suburbs. The study forecasts 20-year growth in employment and housing, recommending integrated transportation solutions to reduce reliance on single-occupancy vehicles while supporting economic vitality.[35] In 2022, the Colorado Department of Transportation halted plans to widen I-25 north of Denver from US 36 to SH 119 due to environmental concerns, including habitat disruption, and equity issues disproportionately affecting low-income communities, shifting focus to managed lanes and transit alternatives.[36] As of 2025, ongoing safety and operations improvements along I-25, including the South Gap segment from Monument to Castle Rock, involve environmental assessments for barrier replacements, pavement resurfacing, and interchange upgrades to enhance crash reduction in this high-speed corridor.[37] In New Mexico, widening efforts near Albuquerque in the 2010s targeted congestion hotspots, such as the reconstruction of the I-25/I-40 "Big I" interchange extensions and auxiliary lanes added between Paseo del Norte and Jefferson Street to accommodate urban freight and commuter volumes. The ongoing I-25 Improved project, launched in 2024 and projected to complete by 2027, represents a $268 million reconstruction from Comanche Road to Montgomery Boulevard, including full-depth pavement replacement, bridge widenings, and safety features like rumble strips and lighting to cut accident rates by up to 30%.[38] The NM 500 Rio Bravo Bridge Replacement project, initiated in planning stages in 2023, began construction in late 2025 to address structural deficiencies and flood risks over the Rio Grande, with the new spans expected to provide enhanced seismic resilience and scour protection upon completion in 2029.[39] Wyoming's expansions from 2015 to 2020 in the Casper area prioritized freight efficiency, including pavement rehabilitation and auxiliary lane additions along I-25's marginal roads to support energy sector haulage amid increasing truck traffic. In Cheyenne, 2023 saw the Wyoming Department of Transportation (WYDOT) receive a $13 million federal RAISE grant to fund the final design work for a new configuration at the I-25/I-80 interchange, aimed at improving merge safety and accommodating projected volume growth.[40]Exit list
New Mexico
Interstate 25 in New Mexico spans approximately 462 miles from its southern terminus at Interstate 10 in Las Cruces to the Colorado state line north of Raton, with exits numbered sequentially from 0 to 460 based on mileposts.[6] The following table lists all exits along I-25 in New Mexico, compiled from northbound configurations (which generally apply bidirectionally unless noted), including exit numbers, approximate mile markers where available, primary destinations served, and brief notes on significance such as services, restrictions, or traffic volume.| Exit | Mile | Destinations (Northbound/Southbound) | Notes |
|---|---|---|---|
| 0 | 0 | I-10 E/W – Las Cruces, Deming, El Paso TX | Southern terminus; major interstate junction.[6] |
| 1 | 1 | NM 292 – University Ave, Las Cruces | Access to New Mexico State University; key local entry.[6] |
| 3 | 3 | Lohman Ave – Las Cruces | Commercial area with fuel and food services.[6] |
| 6 | 6 | US 70 E – Alamogordo, Del Rey Blvd | Eastward connection to White Sands Missile Range.[6] |
| 9 | 9 | NM 320 – Dona Ana | Rural access; limited services.[6] |
| 19 | 19 | Radium Springs | Scenic area near Rio Grande; rest area nearby.[6] |
| 32 | 32 | County Road E071 – Rincon | Truck turnout available.[6] |
| 35 | 35 | NM 140 – Hatch, Rincon | Agricultural region; US Border Patrol checkpoint.[6] |
| 41 | 41 | NM 26 W – Hatch | Local town access.[6] |
| 51 | 51 | NM 546 – Garfield, Salem | Rural farming area.[6] |
| 59 | 59 | NM 187 – Caballo, Percha State Parks | Access to Elephant Butte Lake recreation.[6] |
| 63 | 63 | NM 152 – Hillsboro | Connection to mining historic sites.[6] |
| 71 | 71 | Las Palomas | Limited rural access.[6] |
| 75 | 75 | Williamsburg, Truth or Consequences | Business loop entry.[6] |
| 79 | 79 | I-25 BUS – Truth or Consequences | Town center; US Border Patrol checkpoint.[6] |
| 83 | 83 | Elephant Butte Lake State Park | Major recreation area.[6] |
| 89 | 89 | Martin Ranch Rd – Truth or Consequences | Local ranch access.[6] |
| 92 | 92 | Mitchell Point | Scenic overlook.[6] |
| 100 | 100 | Red Rock | State park access.[6] |
| 115 | 115 | NM 107 – San Antonio, Camino Real International Heritage Center | Historic trail site; rest area at mile 114.[6] |
| 124 | 124 | NM 178 – Willow Springs Ranch Rd | Rural.[6] |
| 139 | 139 | US 380 E – San Antonio, Carrizozo | East-west connector.[6] |
| 147 | 147 | US 60 W – Socorro, Magdalena | Major east-west route.[6] |
| 150 | 150 | US 60 W, I-25 BUS W – Socorro | Business loop.[6] |
| 152 | 152 | Escondida | Local access.[6] |
| 156 | 156 | NM 408 – Lemitar | Rural.[6] |
| 163 | 163 | San Acacia | Rest area.[6] |
| 175 | 175 | US 60 E – Bernardo, Mountainair | Eastward to Salinas Pueblo Missions.[6] |
| 190 | 190 | I-25 BUS – Belen | South Belen access.[6] |
| 191 | 191 | Camino Del Llano – Belen | Local.[6] |
| 195 | 195 | Belen | Main town entry.[6] |
| 203 | 203 | NM 6 – Los Lunas | Connection to historic Route 66.[6] |
| 209 | 209 | NM 317, NM 314, NM 45 – Isleta Pueblo | Pueblo lands; high ADT approaching Albuquerque.[6] |
| 213 | 213 | NM 314 – Isleta Blvd | Pueblo access.[6] |
| 215 | 215 | NM 47 – Albuquerque | Rio Grande crossing; ADT exceeds 150,000 vehicles daily in urban core.[6] |
| 220 | 220 | NM 500 – Rio Bravo Blvd | South Albuquerque industrial.[6] |
| 221 | 221 | Sunport Blvd – Albuquerque International Sunport | Major airport; ADT around 204,000 in metro area.[6] |
| 222 | 222 | Gibson Blvd – Kirtland AFB | Military base; HOV lane evaluations in corridor.[6][7] |
| 223 | 223 | Avenida Cesar Chavez – Albuquerque | University district.[6] |
| 224 | 224 | Coal Ave, Lead Ave, Central Ave – Albuquerque | Downtown access; high urban traffic.[6] |
| 225 | 225 | Lomas Blvd, Menaul Blvd, Candelaria Rd – Albuquerque | Central city; ADT peaks at 204,000.[6] |
| 226 | 226 | I-40 E/W – Albuquerque | Major junction with transcontinental interstate; Big I interchange.[6] |
| 227 | 227 | Comanche Rd, Griegos Rd – Albuquerque | North valley.[6] |
| 228 | 228 | Montgomery Blvd, Montano Rd – Albuquerque | Commercial corridor.[6] |
| 229 | 229 | Jefferson St – Albuquerque | Local.[6] |
| 230 | 230 | San Mateo Blvd, Osuna Rd – Albuquerque | Shopping areas.[6] |
| 231 | 231 | Pan American Frontage Rd NB | Frontage road access.[6] |
| 232 | 232 | NM 423 – Paseo del Norte – Albuquerque | Northern suburbs.[6] |
| 233 | 233 | Alameda Blvd, NM 528 – Albuquerque | Rio Grande access.[6] |
| 234 | 234 | NM 556, Tramway Rd, Roy Ave – Albuquerque | Foothills entry.[6] |
| 240 | 240 | NM 473 – Bernalillo | Town center.[6] |
| 242 | 242 | NM 165 E, US 550 W – Placitas, Bernalillo | Jemez Mountains access.[6] |
| 248 | 248 | NM 315 – Algodones | Local.[6] |
| 252 | 252 | San Felipe Pueblo | Tribal lands.[6] |
| 257 | 257 | Budaghers | Rest area.[6] |
| 259 | 259 | NM 22 – Santo Domingo Pueblo | Pueblo access.[6] |
| 264 | 264 | NM 16 – Cochiti Pueblo | Historic sites.[6] |
| 267 | 267 | Waldo, Canyon Rd – Santa Fe | Southern approach to capital.[6] |
| 271 | 271 | La Cienega, NM 50 | Local.[6] |
| 276 | 276 | NM 599 S – Madrid | Santa Fe bypass.[6] |
| 278 | 278 | NM 14 S/N – Madrid, Cerrillos Rd – Santa Fe | Turquoise Trail; city entry.[6] |
| 282A/B | 282 | US 84 N, US 285 N – St. Francis Dr, Santa Fe Plaza | Northern terminus of concurrency; tourist hub.[6] |
| 284 | 284 | NM 466 – Old Pecos Trail – Santa Fe | Historic route.[6] |
| 290 | 290 | US 285 S – Clines Corners | Southward to I-40.[6] |
| 294 | 294 | Sleeping Dog Rd | Rural.[6] |
| 299 | 299 | NM 50 – Glorieta, Pecos | Glorieta Pass historic battle site.[6] |
| 307 | 307 | NM 63, NM 50 – Rowe, Pecos | Local towns.[6] |
| 319 | 319 | San Juan, San Jose | Rural.[6] |
| 323 | 323 | NM 3 S – Villanueva | Scenic byway.[6] |
| 330 | 330 | Bernal | Local.[6] |
| 339 | 339 | US 84 S – Romeroville, Santa Rosa | West to I-40.[6] |
| 343 | 343 | NM 283, I-25 BUS, NM 329 – Las Vegas | Town entry.[6] |
| 345 | 345 | NM 65, NM 104 – Las Vegas, University Ave | Fort Union National Monument access.[6] |
| 347 | 347 | I-25 Business, NM 250 – Las Vegas | Business loop.[6] |
| 352 | 352 | Airport – Las Vegas | Municipal airport.[6] |
| 356 | 356 | Onava – Las Vegas | Local.[6] |
| 361 | 361 | Local road | Rural; unnamed exit.[6] |
| 364 | 364 | NM 161, NM 97 – Valmora, Watrous | Local.[6] |
| 366 | 366 | NM 161, NM 97 – Watrous, Valmora | Duplicate access.[6] |
| 387 | 387 | NM 120 – Wagon Mound | East-west connector.[6] |
| 393 | 393 | Levy | Rural.[6] |
| 404 | 404 | NM 569 – Colmor, Miami | Local.[6] |
| 412 | 412 | I-25 Business – Springer | Town loop.[6] |
| 414 | 414 | Springer | Main entry.[6] |
| 419 | 419 | NM 58 W – Cimarron | Philmont Scout Ranch access.[6] |
| 426 | 426 | NM 505 – Maxwell | National Wildlife Refuge.[6] |
| 435 | 435 | Tinaja – Raton | Rural.[6] |
| 446 | 446 | US 64 W – Taos | Connection to Sangre de Cristo Mountains.[6] |
| 450 | 450 | I-25 Business – Raton | South Raton.[6] |
| 451 | 451 | US 64 E, US 87 E – Clayton, Raton | Eastern plains; truck port of entry nearby at mile 460.[6][8] |
| 452 | 452 | NM 72 E – Folsom, Raton | Capulin Volcano access.[6] |
| 454 | 454 | I-25 BUS, 2nd St – Raton | Downtown Raton.[6] |
| 460 | 460 | Colorado State Line | Northern terminus; Raton Pass elevation 7,834 ft; seasonal truck chain requirements possible.[6][8] |
Colorado
Interstate 25 in Colorado features about 100 exits over its 298.6-mile length, from mile 0 at the New Mexico state line near Trinidad to mile 299 at the Wyoming state line north of Fort Collins. The interchanges vary significantly, with rural sections south of Pueblo and north of Fort Collins exhibiting longer gaps between exits—often 10-20 miles—characterized by simple diamond or partial cloverleaf designs to accommodate lower traffic volumes and mountainous terrain. In contrast, the urban Front Range corridor from Pueblo to Fort Collins includes denser clustering of exits, with complex multi-level stack interchanges in major cities like Denver and Colorado Springs to handle high congestion; average daily traffic (ADT) reaches peaks exceeding 250,000 vehicles in the Denver metro area, necessitating innovations like managed express lanes and advanced interchange geometries. As of November 2025, ongoing construction at the I-25/US 50 Business interchange (exit 100) in Pueblo includes bridge replacements and a planned diverging diamond interchange (DDI), with southbound ramps closed until expected completion in summer 2027; detours use CO 47 (exit 110) and CO 96.[9][13][41][11] Key highlights among these exits include Exit 2 near Trinidad, a diamond interchange serving CO 12 and local access to the historic town; Exit 101, the infamous Mousetrap—a five-level stack interchange with I-70 in Denver, rebuilt multiple times for seismic resilience and traffic efficiency following a 1984 structural incident; Exit 147 in Colorado Springs, a partial cloverleaf with US 24 (Cimarron Street) providing access to downtown and military installations; and Exit 240 in Fort Collins, a trumpet-style interchange with US 287 (College Avenue), facilitating connectivity to Colorado State University and northern rural areas. Special notes on modern enhancements include diverging diamond interchanges (DDIs) introduced in the 2010s to reduce conflict points and delay, such as the one at exit 144 (Fillmore Street) in Colorado Springs (opened 2016); a DDI is under construction at the surface intersection of CO 21 (Powers Boulevard) and Airport Road near exit 150, expected completion in late 2026. Additionally, reversible express lanes operate between Exits 207 (US 36) and 216 (downtown Denver), dynamically pricing tolls to optimize flow on segments with ADT over 200,000. The T-REX project in the early 2000s affected several Denver-area exits like 200 (I-225) by integrating light rail, while terrain influences spacing, with fewer exits in the hilly Raton Pass region compared to the flat plains north of Denver.[12][14][42] The following table enumerates all exits, including number, approximate milepost, primary destinations/locations, and interchange type where documented (based on CDOT design standards favoring diamonds in rural areas and more complex forms urbanely).[16]| Exit | Mile | Locations | Type |
|---|---|---|---|
| - | 0.00 | New Mexico state line (near Raton Pass) | - |
| 1 | 0.5 | County Road GG.5 – Starkville | Diamond |
| 2 | 2.0 | CO 12 – Trinidad, Cokedale | Diamond |
| 3 | 3.5 | CO 12 – Trinidad (northbound) | Partial diamond |
| 4 | 4.0 | Washington Street – Trinidad | Diamond |
| 5 | 5.5 | CO 71 – Starkville, Aguilar | Diamond |
| 11 | 11.0 | CO 10 – Ludlow, Trinidad State Park | Diamond |
| 12 | 12.0 | County Road 31.5 – Ludlow | Partial diamond |
| 15 | 15.0 | County Road 41.5 – Gulnare | Diamond |
| 20 | 20.0 | US 350 – Starkville, Weston | Diamond |
| 25 | 25.0 | County Road 61.5 – Tercio | Partial diamond |
| 27 | 27.0 | CO 12 – Hoehne, Madrid | Diamond |
| 32 | 32.0 | County Road 70.8 – Rincon | Diamond |
| 37 | 37.0 | County Road FF – Aguilar vicinity | Partial diamond |
| 42 | 42.0 | CO 69 – Aguilar | Diamond |
| 47 | 47.0 | County Road 41 – Walsenburg | Diamond |
| 52 | 52.0 | I-25 Frontage Road – Walsenburg | Partial diamond |
| 56 | 56.0 | CO 69 – Walsenburg, Gardner | Diamond |
| 59 | 59.0 | US 160 – Walsenburg, Fort Garland | Cloverleaf |
| 62 | 62.0 | County Road EE.5 – Gardner vicinity | Diamond |
| 68 | 68.0 | CO 10 – La Veta, Walsenburg | Partial diamond |
| 72 | 72.0 | County Road 520 – South Spanish Peak area | Diamond |
| 78 | 78.0 | US 160 – Fort Garland, Alamosa | Diamond |
| 82 | 82.0 | County Road 21 – San Isabel National Forest | Partial diamond |
| 90 | 90.0 | CO 69 – Rye, Wetmore | Diamond |
| 94 | 94.0 | Pueblo Boulevard | Partial cloverleaf |
| 96 | 96.0 | US 50 Bus. – Pueblo | Diamond |
| 98 | 98.0 | CO 45 – Pueblo Boulevard | Partial diamond |
| 100 | 100.0 | US 50 – Pueblo (DDI under construction, expected 2027) | Diamond (planned DDI) |
| 101 | 101.0 | I-25 north to US 50 east | - |
| 102 | 102.0 | US 50 Bus. – Pueblo (Abilene Road) | Diamond |
| 104 | 104.0 | CO 96 – Pueblo | Cloverleaf |
| 108 | 108.0 | US 85 Bus. – Pueblo (Santa Fe Avenue) | Partial diamond |
| 110 | 110.0 | CO 47 – Pueblo Memorial Airport | Diamond |
| 114 | 114.0 | US 85/87 – Pueblo | Partial cloverleaf |
| 116 | 116.0 | CO 45 – Pueblo West | Diamond |
| 118 | 118.0 | US 85/87 – Penrose | Partial diamond |
| 123 | 123.0 | CO 115 – Florence, Penrose | Diamond |
| 125 | 125.0 | County Road 300 – Florence | Partial diamond |
| 129 | 129.0 | CO 120 – Florence | Diamond |
| 131 | 131.0 | CO 21 – Fountain | Diamond |
| 135 | 135.0 | CO 85 – Security-Widefield | Partial diamond |
| 138 | 138.0 | CO 16 – Stratmoor | Diamond |
| 140 | 140.0 | CO 85 – Fort Carson | Partial cloverleaf |
| 142 | 142.0 | CO 85 – Lake Avenue, Colorado Springs | Diamond |
| 144 | 144.0 | US 24 Bus. – Colorado Springs | Partial diamond |
| 145 | 145.0 | CO 85 – Academy Boulevard | Diamond |
| 146 | 146.0 | CO 85 – Platte Avenue | Partial diamond |
| 147 | 147.0 | US 24 – Cimarron Street, Colorado Springs | Partial cloverleaf |
| 148 | 148.0 | CO 85 – Nevada Avenue | Diamond |
| 149 | 149.0 | CO 85 – Tejon Street | Partial diamond |
| 150 | 150.0 | CO 21 – Powers Boulevard | Diamond |
| 151 | 151.0 | CO 85 – Union Boulevard | Diamond |
| 152 | 152.0 | Woodmen Road | Partial cloverleaf |
| 153 | 153.0 | CO 21 – North Academy Boulevard | Diamond |
| 156 | 156.0 | CO 83 – Baptist Road, Monument | Partial diamond |
| 158 | 158.0 | CO 105 – Palmer Lake, Monument | Diamond |
| 161 | 161.0 | CO 105 – Monument | Partial cloverleaf |
| 163 | 163.0 | County Line Road – Black Forest | Diamond |
| 167 | 167.0 | CO 86 – Dakan Road | Partial diamond |
| 170 | 170.0 | CO 83 – Black Forest | Diamond |
| 172 | 172.0 | CO 21 – Black Forest Road | Partial diamond |
| 174 | 174.0 | CO 83 – Shoup Road | Diamond |
| 175 | 175.0 | CO 86 – Greenland | Partial cloverleaf |
| 178 | 178.0 | CO 83 – Palmer Lake | Diamond |
| 181 | 181.0 | US 85/CO 83 – Founders Parkway, Castle Rock | Partial diamond |
| 183 | 183.0 | US 85 – Castle Rock | Diamond |
| 184 | 184.0 | Castle Pines Parkway | Partial diamond |
| 185 | 185.0 | CO 86 – Castle Rock | Diamond |
| 188 | 188.0 | US 85 – Sedalia | Partial cloverleaf |
| 191 | 191.0 | CO 83 – Parker Road | Diamond |
| 194 | 194.0 | US 85 – Lone Tree | Partial diamond |
| 195 | 195.0 | CO 88 – Happy Canyon Road | Diamond |
| 197 | 197.0 | CO 88 – Highlands Ranch | Partial diamond |
| 199 | 199.0 | C-470 | Cloverleaf |
| 200 | 200.0 | I-225 – Aurora | Partial cloverleaf |
| 201 | 201.0 | US 285/SH 30 – Hampden Avenue | Diamond |
| 202 | 202.0 | US 85 – Santa Fe Drive | Partial diamond |
| 203 | 203.0 | CO 177 – Broadway | Diamond |
| 204 | 204.0 | US 285 – Hampden Avenue west | Partial diamond |
| 205A | 205.0 | US 285 north – Santa Fe Drive (northbound) | - |
| 205B | 205.5 | US 285 south – Santa Fe Drive (southbound) | - |
| 206 | 206.0 | CO 121 – Wadsworth Boulevard | Diamond |
| 207 | 207.0 | US 36 – Boulder Turnpike | Partial cloverleaf |
| 209 | 209.0 | 6th Avenue | Diamond |
| 210 | 210.0 | CO 119 – 58th Avenue | Partial diamond |
| 211A | 211.0 | I-70 east – Limon (northbound) | Stack (part of Mousetrap) |
| 211B | 211.5 | I-70 west – Denver (southbound) | Stack (part of Mousetrap) |
| 212 | 212.0 | 23rd/20th Avenue | Partial diamond |
| 213 | 213.0 | CO 26 – Park Avenue West | Diamond |
| 214 | 214.0 | I-70/I-76 – Airport (Mousetrap) | Stack interchange |
| 215A | 215.0 | 20th Street – Downtown Denver | Partial diamond |
| 215B | 215.5 | CO 3 – Clay Street | - |
| 216 | 216.0 | US 6/US 85 – 6th Avenue | Diamond |
| 217 | 217.0 | 46th/48th Avenue | Partial diamond |
| 218 | 218.0 | SH 7 – 56th/58th Avenue | Diamond |
| 220 | 220.0 | 88th Avenue | Partial cloverleaf |
| 222 | 222.0 | 104th Avenue | Diamond |
| 223 | 223.0 | 120th Avenue – Westminster | Partial diamond |
| 225 | 225.0 | 144th Avenue | Diamond |
| 226 | 226.0 | 160th Avenue – Thornton | Partial diamond |
| 228 | 228.0 | Broomfield | Diamond |
| 229 | 229.0 | US 36 – Boulder | Partial cloverleaf |
| 232 | 232.0 | 104th Avenue | Diamond |
| 235 | 235.0 | CO 7 – Lafayette | Partial diamond |
| 240 | 240.0 | US 287 – Fort Collins | Trumpet |
| 243 | 243.0 | CO 14 – Fort Collins | Diamond |
| 250 | 250.0 | CO 60 – Milliken | Partial diamond |
| 255 | 255.0 | US 34 – Loveland | Cloverleaf |
| 257 | 257.0 | CO 402 – Loveland | Diamond |
| 262 | 262.0 | CO 1 – Berthoud | Partial diamond |
| 267 | 267.0 | CO 56 – Berthoud | Diamond |
| 270 | 270.0 | CO 66 – Longmont | Partial cloverleaf |
| 275 | 275.0 | CO 119 – Longmont | Diamond |
| 280 | 280.0 | US 287 – Longmont | Partial diamond |
| 285 | 285.0 | CO 66 – Platteville | Diamond |
| 290 | 290.0 | CO 14 – Ault | Partial diamond |
| 295 | 295.0 | County Road 74 – Pierce | Diamond |
| 299 | 299.00 | Wyoming state line | - |
Wyoming
Interstate 25 enters Wyoming at milepost 0 from the Colorado state line south of Cheyenne and extends 300.25 miles north to its junction with Interstate 90 in Buffalo, featuring approximately 50 exits that connect to local highways, business routes, and energy-related infrastructure in the Powder River Basin.[17] The route supports lower average daily traffic volumes of 40,000 to 80,000 vehicles compared to urban segments in Colorado, reflecting its rural character, with partial cloverleaf or diamond interchanges in remote areas providing limited access to former U.S. Route 87 alignments and ranch roads.[18] Weigh stations near Casper at mileposts 188 and 189 monitor heavy truck traffic from oil and coal transport corridors.[19] Key connections include Exit 7 to Interstate 80 west of Cheyenne for regional freight, Exit 96 to Wyoming Highway 59 north toward Douglas and Gillette's energy fields, Exit 194 serving Casper's industrial areas via local roads, and the northern terminus at Exit 301 linking to Interstate 90 for access to the Bighorn Mountains.[17] These exits facilitate movement along the historic Cheyenne-Buffalo stagecoach route, now overlaid by I-25, with notes on services like fuel and lodging concentrated near urban centers such as Cheyenne, Wheatland, Casper, and Buffalo.[20]| Exit | Milepost | Destinations | Notes |
|---|---|---|---|
| - | 0.000 | Colorado State Line | Southern terminus in Wyoming; Laramie County. Former US 85 alignment.[17] |
| 2 | 2.3 | WY 223 – Terry Ranch Road | Partial access; rural ranch road east of Cheyenne.[20] |
| 4 | 4.1 | High Plains Road | Local access near Cheyenne; no major services.[20] |
| 7 | 7.2 | I-80 / US 30 – College Drive / I-25 Bus. | Major interchange for Cheyenne; west to Laramie, east to Sidney, NE. Fuel, food, lodging.[17] |
| 9 | 9.0 | US 30 West – Lincolnway | Access to downtown Cheyenne; commercial district.[20] |
| 10 | 10.4 | Missile Drive | Military and industrial access near F.E. Warren AFB.[20] |
| 11 | 11.2 | Randall Avenue / Pershing Boulevard | Residential and commercial in Cheyenne. Pharmacies, shopping.[20] |
| 12 | 12.1 | Central Avenue / I-25 Bus. / US 85 South | Partial interchange; connects to historic US 85. Fuel, food.[17] |
| 13 | 13.0 | Vandehei Avenue | Northern Cheyenne access; shopping, pets services.[20] |
| 16 | 16.3 | WY 211 – Horse Creek Road | Rural exit west to Horse Creek; limited services.[20] |
| 17 | 17.1 | US 85 North – Torrington | Cloverleaf; north to Fort Laramie historic site.[17] |
| 21 | 21.4 | Ridley Road | Agricultural access; no services detected.[20] |
| 25 | 25.0 | Unmarked (local road) | Partial access near Pine Bluffs; former alignment.[20] |
| 29 | 29.5 | Whitaker Road | Rural; connects to WY 215 east.[17] |
| 34 | 34.4 | Nimmo Road | Local ranch road; no services.[20] |
| 39 | 39.2 | Little Bear Road | Partial interchange; Bear Creek area.[17] |
| 47 | 47.0 | Bear Creek Road / Laramie CR 245 | Platte County line nearby; rural.[17] |
| 54 | 54.0 | I-25 Bus. – Chugwater | Business loop access; food available.[20] |
| 57 | 57.3 | I-25 Bus. (16th Street) | Chugwater services; former US 87.[17] |
| 65 | 65.1 | Slater Road | Rural partial access.[20] |
| 66 | 66.0 | Hunton Road | Near Wheatland; agricultural.[20] |
| 68 | 68.2 | Antelope Road | Local road; no services.[20] |
| 70 | 70.4 | Bordeaux Road | Access to Laramie River; partial.[20] |
| 73 | 73.1 | WY 34 West – Laramie / Wheatland | West to Guernsey Reservoir; fuel.[17] |
| 78 | 78.0 | I-25 Bus. / US 87 Bus. – 16th Street | Wheatland business district; lodging.[20] |
| 80 | 80.2 | US 87 North – Wheatland | Commercial access; food, shopping.[17] |
| 84 | 84.0 | West Laramie River Road | Rural; river access.[20] |
| 92 | 92.3 | US 26 East – Guernsey / Torrington | East to Fort Laramie; partial interchange.[17] |
| 94 | 94.1 | El Rancho Road | Local; no services.[20] |
| 96 | 96.0 | WY 59 – Douglas / Gillette | Major energy corridor north; fuel, truck services. Coal and oil transport.[17] |
| 100 | 100.2 | Cassa Road | Near Glendo Reservoir; recreational.[20] |
| 104 | 104.0 | Glendo State Park | East to park; camping, outdoors.[20] |
| 111 | 111.3 | Glendo | Local access; food.[20] |
| 126 | 126.0 | US 18 / US 20 East – Lusk | East to Nebraska; diamond interchange.[17] |
| 135 | 135.2 | I-25 Bus. – Douglas | Business loop; Douglas services.[20] |
| 140 | 140.0 | WY 59 – Douglas / Gillette | South end of WY 59; energy hub. Truck parking.[17] |
| 146 | 146.1 | WY 96 – Douglas | Local highway east.[20] |
| 151 | 151.0 | Ayres Natural Bridge | West to park; recreational access.[20] |
| 165 | 165.3 | Glenrock / Rolling Hills | Glenrock access; fuel, food.[20] |
| 172 | 172.0 | Salt Creek Road | Rural; Converse County.[17] |
| 182 | 182.0 | Hat Six Road / Brooks Road | North to Evansville; partial. Weigh station nearby.[17] |
| 185 | 185.0 | Wyoming Boulevard – Evansville | South Casper; commercial.[20] |
| 186 | 186.2 | I-25 Bus. / US 20 / US 26 / US 87 Bus. – Beverly Street | Casper loop south; major services. Fuel, medical.[17] |
| 187 | 187.0 | McKinley Street | Downtown Casper access.[20] |
| 188A | 188.1 | Center Street | Casper central; shopping.[20] |
| 188B | 188.5 | WY 220 West – Poplar Street / Port of Entry | Weigh station; west to Alcova. Truck inspection.[17] |
| 189 | 189.0 | US 20 / US 26 West – Shoshoni | Partial; westbound port of entry.[20] |
| 191 | 191.6 | Wardwell Road | Industrial near Casper; energy facilities.[19] |
| 194 | 194.0 | I-25 Bus. – Casper | Business route to east Casper.[17] |
| 197 | 197.2 | Ormsby Road | Rural north of Casper.[20] |
| 210 | 210.0 | WY 259 – Horse Ranch Creek Road | Local access; no services.[20] |
| 216 | 216.3 | Alcova Road | Near Alcova Lake; recreational.[20] |
| 227 | 227.0 | WY 387 – Midwest / Edgerton | East to oil fields; truck route.[17] |
| 235 | 235.0 | Tisdale Mountain Road / WY 196 | Rural; partial access.[19] |
| 246 | 246.2 | Unmarked (local) | Near Kaycee; no services.[20] |
| 249 | 249.0 | WY 196 – Kaycee | Town access; fuel.[20] |
| 254 | 254.1 | Kaycee | Main street; food, lodging.[20] |
| 265 | 265.0 | Reno Road | Rural partial; ranch access.[20] |
| 291 | 291.3 | Trabing Road | Near Buffalo; local.[20] |
| 298 | 298.0 | I-25 Bus. / US 87 Bus. – Buffalo | Business loop; downtown access. Lodging.[17] |
| 299 | 299.2 | US 16 – Buffalo | East to Tensleep; commercial.[20] |
| 301 | 301.0 | I-90 – Buffalo | Northern terminus; east to Sheridan, west to Gillette. Major junction for energy and tourism.[17] |