Architect
Date Built	1976
Location	Blue Lakes Blvd N, Twin Falls Idaho
Description
The Perrine Bridge crosses the Snake River Canyon near the community of Twin Falls, Idaho.  It stands 486 feet above the Snake River and carries a four-lane road and a pedestrian walkway across the 1500 foot span.  The "HighestBridges.com" website explains that, "... Above the massive steel truss-arch are 19 spandrel spaces, each just over 52 feet (16 mtrs) long. The south side has two approach spans, each approximately 145 feet (44 mtrs) long while the north side has two approach spans of approximately 106 feet (32 mtrs) in length. The main span was constructed using the stayed cantilever method whereby individual pieces of the arch were lowered down from a highline and held in place by a series of stay cables that temporarily radiated out from the end of an already completed approach span on either side of the canyon. Once the two arch halves were joined in the middle, the cable stays were removed and the highline was then used to place the final spandrel supports and deck spans." The bridge is named after Ira Burton Perrine, a local farmer, rancher and business man credited as a co-founder of Twin Falls and a prime mover in the project that brought irrigation to farmers in the area.