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Perrine Bridge

The I. B. Perrine Bridge is a four-lane steel truss-arch bridge spanning the Snake River Canyon on the northern edge of Twin Falls, Idaho, United States.^[1]^[2] It measures 1,500 feet in length, stands 486 feet above the river, and is 76 feet wide, featuring two 7-foot pedestrian walkways that offer views of the canyon, waterfalls, and surrounding landscape.^[1]^[3]^[4] Completed and opened to traffic on July 31, 1976, the bridge was constructed using the stayed cantilever method with temporary stay cables and COR-TEN steel, at a cost of $10.656 million.^[1]^[5]^[2] The bridge replaced the original Twin Falls-Jerome Intercounty Bridge, a cantilever structure that opened as a toll bridge on September 1, 1927, after construction costing $662,406; at the time, it was the third highest bridge in the world.^[1]^[3]^[6] Tolls, which included 60 cents per vehicle (equivalent to about $9 today) and 5 cents per passenger for northbound travel, were eliminated in 1940 when the state of Idaho purchased the bridge.^[3] The original 1,400-foot-long, 476-foot-high bridge, which carried two lanes of traffic, fell into disrepair over decades and was demolished during the replacement project that began in April 1973.^[1]^[5] The new structure, three times wider than its predecessor, received second place in the Federal Highway Administration's Outstanding Major Highway Structural Feature award in 1977.^[1] Officially named the I. B. Perrine Bridge in 2000 by Idaho Code 40-513A, it honors early 20th-century irrigation pioneer Ira Burton Perrine and now carries over 40,000 vehicles daily as U.S. Highway 93.^[1]^[3]^[7] Due to increasing traffic, the Idaho Transportation Department has studied options for an additional Snake River crossing as of 2025.^[8] The bridge's main span is 993 feet, supported by an arch with 19 spandrel spaces each approximately 52 feet long, and it is one of the tallest bridges in the United States.^[5]^[2] Beyond transportation, it serves as a major tourist attraction, with parking and a visitor center on the south side providing access to canyon rim trails; the nearby south rim also features remnants of Evel Knievel's 1974 rocket-powered jump ramp over the canyon.^[4] Most notably, the Perrine Bridge is the only fixed bridge in the United States where BASE jumping is legal year-round without permits, drawing hundreds of jumpers annually to leap from its walkways to the canyon floor 486 feet below.^[5]^[4]^[9]

Location and Geography

Setting in Snake River Canyon

The Perrine Bridge spans the Snake River Canyon immediately north of Twin Falls, Idaho, linking the city's south rim location to the expansive north rim and facilitating access across the dramatic chasm carved by the river. This positioning places the bridge at a key juncture in the Magic Valley region, where the canyon serves as a natural boundary between Twin Falls County and adjacent areas to the north. Named for I.B. Perrine, whose early 20th-century irrigation initiatives transformed the arid landscape into productive farmland, the bridge enhances connectivity within this historically water-scarce environment.^[10]^[4] At the bridge site, the Snake River Canyon reaches a depth of approximately 486 feet from the structure's deck to the river surface below, with a width of roughly 1,000 feet accommodating the bridge's main arch span of 993 feet. Upstream, the canyon narrows in places while hosting Shoshone Falls, a towering cascade exceeding 200 feet in height and recognized as one of North America's tallest waterfalls, located approximately 5 miles along the river from the bridge. These dimensions highlight the canyon's rugged scale, shaped by millennia of fluvial erosion through resistant volcanic rock layers.^[11]^[2]) Geologically, the canyon originated from intense volcanic activity in the Snake River Plain during the Miocene epoch, where successive basalt and rhyolite flows built up thick layers of lava up to 2 miles deep, later dissected by the river. The modern form was dramatically sculpted around 17,400 years ago by the cataclysmic Bonneville Flood—a massive outburst from prehistoric Lake Bonneville that unleashed waters with a peak flow of approximately 55 times that of the average Mississippi River, eroding narrow gorges and depositing enormous boulders throughout the section near Twin Falls. Ongoing erosion from wind, water, gravity, and freeze-thaw cycles continues to refine the steep basalt cliffs and talus slopes visible from the bridge.^[12] The Snake River sustains a rich local ecosystem within the canyon, irrigating approximately 1 million acres of farmland in the surrounding Magic Valley while providing critical habitat for wildlife adapted to its riparian zones and springs. The river supports populations of native fish like rainbow trout and unique invertebrates, including the endemic Snake River physa snail, alongside riparian vegetation that stabilizes banks and filters pollutants. Avian diversity thrives here, with the canyon hosting one of the densest concentrations of nesting birds of prey in North America—such as golden eagles, prairie falcons, and ferruginous hawks—drawn to the thermal updrafts and prey-rich environs, as well as serving as a key stopover for migratory waterfowl and shorebirds numbering in the hundreds of thousands annually.^[13]^[14]^[15]^[16] The bridge seamlessly integrates with the Canyon Rim Trail system, a network of over 10 miles of paved, accessible paths winding along the south rim from near the Perrine Bridge eastward to Shoshone Falls and beyond. Pedestrian walkways on the bridge itself offer direct overlooks of the river 486 feet below, connecting to trail segments that provide elevated vantage points for observing the canyon's layered geology, wildlife, and seasonal wildflower blooms without venturing into the rugged interior. This linkage promotes non-motorized exploration, with trailheads adjacent to the bridge enabling visitors to hike or bike while immersing in the canyon's natural contours.^[17]^[18]

Role in Regional Transportation

The Perrine Bridge serves as a critical link in southern Idaho's transportation network, carrying U.S. Highway 93 across the Snake River Canyon and connecting Twin Falls County with Jerome County to the north. This span facilitates essential regional travel between Twin Falls and Jerome, as well as access to Interstate 84 and further points northward, supporting daily commutes for residents and workers in the Magic Valley area. The bridge's role has grown with population and economic expansion, handling increasing volumes of local and through traffic as one of three primary Snake River crossings in the region.^[19]^[20]^[21] Daily traffic on the bridge exceeds 40,000 vehicles, with approximately 11% consisting of commercial trucks that transport goods across southern Idaho. This high volume underscores its importance in regional commuting and freight movement, where congestion has become a notable challenge amid ongoing growth in the Twin Falls-Jerome corridor. As of 2025, the Idaho Transportation Department is studying options for an additional crossing to address increasing congestion and support future growth. The structure, completed in 1976 to replace the original 1927 bridge and accommodate rising traffic demands, integrates into the broader U.S. Highway 93 system, which extends southward toward northern Nevada.^[22]^[1]^[23]^[24]^[25] Economically, the bridge bolsters commerce by enabling the efficient transport of agricultural products from the fertile Snake River Plain, a key hub for Idaho's agribusiness sector that contributes over half of the state's output in food processing and farming. Its position on U.S. 93 supports trade flows between southern Idaho's agricultural heartland and markets in northern Nevada, enhancing connectivity for industries that drive regional growth. Infrastructure enhancements, including pedestrian walkways on both sides, further integrate the bridge into local access networks, providing safe options for non-motorized travel alongside vehicle lanes and approach roads.^[19]^[26]^[5]^[27]

History

Founding of Twin Falls and Irrigation Efforts

Ira Burton Perrine, born in 1861 in Indiana, emerged as a pivotal irrigation pioneer in southern Idaho after arriving in the region in 1884 and settling at Blue Lakes Ranch in the Snake River Canyon. Recognizing the agricultural potential of the arid Snake River Plain, Perrine advocated for large-scale irrigation to transform the desert landscape, drawing on his success with small-scale canyon farming and collaborations with investors. In September 1900, he founded the Twin Falls Land and Water Company (later renamed the Twin Falls Canal Company) in Salt Lake City to develop an extensive canal system, securing water rights for over 244,000 acres on October 8, 1900, under the Carey Act of 1894.^[28]^[29] The establishment of Twin Falls as a settlement hub occurred between 1903 and 1905, fueled by Perrine's promotional efforts and land auctions organized by the company. Construction of the Milner Dam and initial canal infrastructure began in March 1903, with the dam opening on March 1, 1905, enabling water delivery to the Twin Falls Southside Tract. The first land drawing on July 1, 1903, attracted limited interest, but a second drawing on October 20, 1904, drew settlers from across the nation, leading to the rapid development of townsites including Twin Falls, Kimberly, Buhl, Filer, Hansen, and Murtaugh. By September 15, 1909, settlers had formalized acceptance of the tract, marking the area's shift from sagebrush desert to organized farmland.^[29]^[28] Complementing these private efforts, the federal Minidoka Reclamation Project, authorized in 1904 and operational by 1905, played a crucial role in irrigating the broader Snake River Plain, converting over 600,000 acres of arid land into productive agricultural fields through dams, canals, and reservoirs. This project, managed by the U.S. Bureau of Reclamation, supported crops like potatoes, grains, and sugar beets across southeastern Idaho, with Twin Falls serving as a key commercial center. The combined irrigation initiatives spurred rapid population growth—from 13,543 residents in Twin Falls County in 1910 to 28,398 by 1920—along with expanding canal networks and economic activity that increasingly required reliable crossings over the deep Snake River Canyon.^[30]^[28]^[29] By the 1920s, the burgeoning settlements on both sides of the canyon, driven by irrigation-dependent agriculture, heightened the demand for a permanent bridge to facilitate trade, travel, and connectivity, a need Perrine had foreseen as early as 1895 when scouting sites for the Oregon Short Line Railroad. The resulting structure, completed in 1927.^[29]^[28]

Original Bridge Construction and Service

The original Perrine Bridge, initially named the Twin Falls-Jerome Intercounty Bridge, was planned in the mid-1920s to facilitate transportation across the Snake River Canyon amid the rapid agricultural expansion in southern Idaho's Magic Valley, fueled by early 20th-century irrigation projects.^[3] Funded through private investment by the Seattle-based Twin Falls-Jerome Intercounty Bridge Company, the project cost $662,406 and aimed to link Twin Falls and Jerome counties, reducing travel times and boosting regional trade.^[1] Construction of the cantilever steel bridge was carried out by the Dravo Construction Company of Pittsburgh from 1926 to 1927, resulting in a two-lane structure that opened to traffic on September 1, 1927, as a toll facility charging $0.60 per automobile and $0.05 per additional passenger.^[1] The bridge spanned 1,400 feet in length and rose 476 feet above the river, making it one of the highest bridges in the world at the time and a vital link for the Sawtooth Park Highway, the precursor to U.S. Highway 93.^[1] The state of Idaho purchased the toll bridge in 1940, eliminating fees and integrating it into the public highway system.^[3] Over nearly five decades of service, the bridge handled increasing vehicular loads but encountered significant challenges, including structural deterioration from corrosion, cracking, and broken members exacerbated by the harsh canyon environment and heavy use.^[1] Its narrow lanes contributed to safety concerns, prompting weight restrictions that curtailed truck traffic, while rising regional traffic volumes highlighted its obsolescence by the mid-1970s, ultimately leading to plans for replacement.^[1]

Replacement with the Current Structure

By the late 1960s, the original 1927 Twin Falls-Jerome Intercounty Bridge had deteriorated significantly due to decades of service, including corrosion, cracking, and structural weaknesses that limited its load capacity. In 1966, it failed a routine inspection for a 25-ton payload and was downgraded to just 22 tons, necessitating a replacement to ensure safe regional connectivity. The nearby Hansen Bridge, completed in 1966, served as a temporary alternative during the planning phase.^[19] Planning for the new structure advanced under the Idaho Department of Transportation, with design responsibilities assigned to HNTB Engineering of Seattle, emphasizing a modern truss-arch configuration to span the Snake River Canyon more effectively. The project received funding of $10.56 million and was contracted to the Allied Structural Steel Company of Hammond, Indiana, for fabrication and erection. Construction commenced in April 1973, allowing the original bridge to remain in limited use for traffic while work progressed alongside it.^[31]^[19] As the new bridge neared completion, the original cantilever span was carefully dismantled in early 1976 to avoid disrupting canyon access or nearby infrastructure. This phased demolition ensured a smooth transition, with workers removing the old steel components piece by piece after the primary arch and deck of the replacement were in place.^[19] The current Perrine Bridge officially opened to traffic on July 31, 1976, following a dedication ceremony that included speeches by local officials, a ribbon-cutting event, and a ceremonial crossing led by a vintage Ford Model T—the same model type that had first traversed the 1927 bridge. The opening marked the end of a three-year construction effort and immediately alleviated longstanding bottlenecks by providing four 12-foot-wide lanes, shoulders, and sidewalks, capable of handling heavier loads without restrictions. This upgrade significantly improved traffic flow between Twin Falls and Jerome counties, supporting daily volumes exceeding 32,000 vehicles and enhancing overall safety through expanded width and modern materials.^[1]^[3]

Engineering and Design

Structural Specifications

The I.B. Perrine Bridge is a steel truss arch structure spanning 1,500 feet in total length, with a main arch span of 993 feet between springlines, a deck width of 64.6 feet to support four traffic lanes and pedestrian walkways, and a clearance height of 486 feet above the Snake River surface.^[19]^[32] The design incorporates 4,330 tons of Cor-TEN weathering steel (ASTM A588 Grade 50) for the primary structural members and high-strength A514 steel for the truss chords, enabling efficient load distribution through the arch and vertical trusses while resisting corrosion in the arid canyon environment; the deck consists of a reinforced concrete slab over steel beams.^[19]^[32] Load-bearing capacity adheres to AASHTO standards, originally rated for 25-ton truck payloads but enhanced through finite element analyses in the mid-2000s to accommodate permit vehicles exceeding standard highway loads, with distribution factors calibrated beyond conventional LRFD formulas due to the bridge's unique geometry.^[19]^[33] Safety elements include steel guardrails along the edges for vehicular and pedestrian protection and modular expansion joints at the approaches to manage thermal expansion and contraction.^[35] In 2023-2024, repairs were conducted including lane closures for maintenance to ensure structural integrity, as of 2024.^[35] The arch span was erected using a cantilever method from both abutments, meeting balanced closure tolerances.^[19]

Construction Methods and Innovations

The construction of the Perrine Bridge employed a stayed cantilever method for its main 993-foot arch span, allowing segments to be built outward from each abutment without extensive temporary supports in the canyon below. Arch pieces were prefabricated and lowered into position using a highline cable system, consisting of an overhead cableway supported by two 200-foot towers spanning approximately 2,000 feet across the site, which transported materials and workers efficiently over the challenging terrain.^[2]^[36] Temporary stay cables, anchored to the completed approach spans, stabilized each segment until the two halves met at the center, after which the stays were removed to allow the arch to assume its final load-bearing form.^[2]^[37] The project's site presented significant engineering challenges due to the Snake River Canyon's 486-foot depth, which precluded the use of full scaffolding across the span; instead, the approach spans—two 145-foot sections on the south side and two 106-foot sections on the north—were erected first using falsework and cranes to provide stable platforms for the cantilever operations. Extensive site preparation was required, including stabilization of the canyon's rock faces and excavation for deep concrete footings, two footings each 60 feet deep and 20 feet across at the base, containing over 1,000 cubic yards of concrete total reinforced with 30 tons of rebar. A workers' strike in June 1974 further delayed progress, compounded by the remote location near Twin Falls and variable Idaho weather conditions during the multi-season build.^[19]^[36]^[38] Key innovations included the bridge's status as the first major steel arch truss structure in Idaho, utilizing 4,330 tons of COR-TEN weathering steel that developed a protective rust-like patina, eliminating the need for painting and harmonizing with the canyon's natural hues. The design, engineered by HNTB of Seattle and fabricated by Allied Steel of Indiana, incorporated bolted connections with 20-ton force for the heavy steel beams (up to 70 tons each), enabling rapid assembly. As of 2025, planning for a new adjacent bridge is underway due to increasing traffic loads.^[19]^[38]^[36]^[23] Despite these hurdles, construction proceeded from April 1973 to completion in July 1976—a 39-month timeline—showcasing efficient project management for such a complex span.

Tourism and Recreation

Scenic Attractions and Visitor Access

The Perrine Bridge offers stunning panoramic views of the Snake River Canyon, including the winding Snake River below, dramatic canyon rims, and distant waterfalls such as Shoshone Falls.^[11] Pedestrian walkways along the 1,500-foot span provide elevated perspectives nearly 500 feet above the river, showcasing layered basalt cliffs, lush riparian zones, and expansive vistas stretching east and west.^[4] The east side of the bridge and adjacent Canyon Rim Trail offer particularly prime viewpoints, where visitors can observe the canyon's geological formations and the river's turquoise waters against arid surroundings.^[10] Visitor access is facilitated by well-developed infrastructure centered around the Twin Falls Visitor Center on the south side of the bridge. A large, free parking area accommodates vehicles, including RVs, with direct pathways leading to the bridge's pedestrian paths and the Canyon Rim Trail system.^[4] The trail integrates seamlessly with nearby state park networks, such as those at Shoshone Falls Park, allowing for extended hikes along the canyon rim. Interpretive signs along the Canyon Rim Trail and at the Visitor Center provide educational details on the area's natural history, geology, and ecology, enhancing the experience for casual explorers. The region attracts hundreds of thousands of visitors annually, drawn by its accessibility from Interstate 84 and proximity to Twin Falls amenities.^[39] Beyond viewpoints, the bridge area supports low-impact recreational activities suited to general tourists. Prime photography spots abound along the walkways and trail, capturing the canyon's rugged beauty at sunrise or sunset for memorable shots.^[11] Wildlife viewing opportunities include sightings of birds of prey, such as hawks and eagles, soaring over the canyon cliffs, with over 140 bird species documented in the surrounding Snake River Canyons Park.^[40] These passive pursuits complement the site's appeal as a gateway for scenic tourism, occasionally overlapping with adventure draws like legal BASE jumping.^[4]

BASE Jumping Legacy and Regulations

The first documented BASE jumps from the Perrine Bridge occurred in 1987, when three residents of Twin Falls—former U.S. Army paratroopers—performed static-line jumps using military surplus MC1-1B parachutes.^[20] Initially off-limits, the activity gained official permission in the early 1990s, transforming the site into one of the few locations worldwide where BASE jumping is permitted year-round without a permit.^[41] This unique status, protected by Idaho state law that prohibits local governments and transportation authorities from banning jumps from bridges, spurred rapid growth in the 1990s, drawing hundreds of participants annually by the decade's end and establishing the Perrine as a global hub for the sport.^[42] Regulations for BASE jumping at the Perrine Bridge are overseen by the Idaho Transportation Department (ITD), emphasizing safety for jumpers, motorists, and the structure itself. Key restrictions include prohibitions on climbing the bridge's understructure or girders, attaching any equipment or lines to the bridge, and standing on railings to avoid distracting drivers.^[43] Jumpers must also adhere to designated landing zones, such as the Mogensen Trail area below the east side, to prevent interference with river traffic or private property.^[44] These rules, implemented to mitigate risks while preserving access, make the Perrine the only fixed structure in the United States allowing unrestricted year-round BASE jumping. The bridge's 486-foot height enables reliable parachute deployment, contributing to its appeal for record-setting attempts and drawing an estimated 5,000 jumps annually from international participants.^[45] In September 2023, local jumper Jonathan Cox set a Guinness World Record for the most BASE jumps in 24 hours via human-powered ascent, completing 102 consecutive jumps—surpassing the prior mark of 57—by hiking back up the canyon after each descent.^[46] However, the sport's dangers are evident in its incident history; since the 1990s, multiple fatalities have occurred, including two in 2002 (Brian Stout and Jason Corcoran), one in 2006 (Shannon Carmel Dean), one in 2007 (Yegor Drozdov), two in 2015 (Bryan Turner and James E. Hickey), one in 2016 (Kristin Renee Czyz), and one in 2019 (Brandon John Chance), for a total of 11 fatalities as of February 2025.^[47]^[45]^[48]^[49]^[50]^[51] Recent non-fatal incidents include serious injuries to two first-time jumpers in May 2025. These events underscore a fatality rate for BASE jumping broadly estimated at 1 in 2,300 jumps, far higher than skydiving, though Perrine-specific data remains limited due to the unregulated nature of the activity.^[52]^[53]

References

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