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The I. B. Perrine Bridge at Twin Falls, Idaho, United States, is a truss arch four-lane bridge carrying U.S. Highway 93 over the Snake River Canyon. Perrine Bridge is approximately long and above the Snake River. The elevation of the road deck is approximately above sea level. The bridge serves as the Twin Falls area's main link to Jerome County and Interstate 84. Originally named the ''Twin Falls-Jerome Intercounty Bridge'', a steel cantilever bridge was opened to traffic in September 1927, and at the time, was the highest bridge in the world. The privately financed $650,000 structure was originally a toll bridge, but the tolls were eliminated in 1940 after the bridge was purchased by the state of Idaho. By the early 1970s, the original bridge was outdated and unable to handle heavy loads and required replacement. Construction on the current bridge began in May 1973〔(Idaho Transportation Department ) - Treasure trove of Perrine Bridge construction slides discovered - 2011-01-21〕 and was completed in July 1976 at a cost of $9,700,000, and the original cantilever bridge to the west was disassembled. The bridge is named for I. B. Perrine, who spearheaded the early 20th century irrigation projects in the Magic Valley region and is largely credited as the main founder of Twin Falls. == Tourism == The 1st documented and VHS/photographed jumps from the Bridge were in 1987 by 3 residents of Twin Falls (former US Army Paratroopers) who static line jumped the bridge using Military Surplus MC1-1B. It was done after a test drop of a 55 gal. Drum in a T-10 parachute harness and canopy was used. Multiple successful jumps were conducted without incident or injury. Adjacent to the south end of the bridge is a parking area with a visitors' center, which allows for easy access to the bridge. To the east, along the south rim of the canyon, lies the dirt ramp used by Evel Knievel when he unsuccessfully attempted to jump the canyon on his steam-powered "skycycle" in 1974. Knievel crashed on the jump because of a parachute malfunction; it opened right after his take off. He survived the crash with only a broken nose. The ramp where he made the leap sits on private property about two miles east of the bridge and is visible from the bridge as well as various vantage points along the Canyon Trail.〔(【引用サイトリンク】title=Evel Knievel Jump Site – Twin Falls, Idaho, ''Idaho Tourism'' )〕 The Perrine Bridge is a popular BASE jumping site known all over the world. It may be the only man-made structure in the United States where BASE jumping is allowed year-round without a permit.〔(【引用サイトリンク】title=Tips for Jumping the Perrine Bridge )〕 In September 2005 Miles Daisher of Twin Falls set a BASE jumping world record by jumping off Perrine Bridge 57 times in a 24-hour period.〔(Miles Daisher, Red Bull Athlete Profile )〕 In July 2006 Dan Schilling jumped off the bridge 201 times in 21 hours to raise money for charity.〔(【引用サイトリンク】title=BASE Jumper Makes It Final At 201, ''Times News'' )〕 Unlike Daisher, Schilling was hoisted to the top of the bridge by a crane after every jump. Located at the southwest end of the Perrine Bridge is the Twin Falls Visitor Center featuring souvenirs and gifts, Idaho products, visitor information, and interactive exhibits highlighting the recreational and historical activities and attractions in the region. BASE Jumpers often use the center as a home-base before and after parachuting from the bridge. The visitor center offers spectacular views of the canyon, bridge, and easy access to the extensively developed trail system along the canyon rim. Trails go under the bridge on either side which offers great vantage points of the bridge and its structure. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Perrine Bridge」の詳細全文を読む スポンサード リンク
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