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The I. B. Perrine Bridge carries US Highway 93 traffic over the Snake River Canyon in Twin Falls, ID. The 1500 foot long four-lane truss arch was completed in July of 1976 and replaced an earlier span that had become outdated. The bridge is named for I. B. Perrine (1861–1943), who spearheaded early 20th century irrigation projects in the Magic Valley region and is largely credited as being the main founder of Twin Falls.