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Snake River Canyon is a large canyon formed by the Snake River in the Magic Valley region of southern Idaho, forming part of the boundary between Twin Falls County to the south and Jerome County to the north. The canyon ranges up to 500 feet (150 meters) deep and 0.25 miles (0.4 kilometers) wide, and runs for just over 50 miles.〔(Magic Valley website ), "River of Stone". Retrieved June, 2014.〕 Perrine Bridge crosses the canyon immediately north of the city of Twin Falls. Shoshone Falls is located approximately 5 miles (8 kilometers) east of Perrine Bridge along the canyon. == History == In the late 19th century I. B. Perrine and others founded the Magic Valley's first successful agricultural operations on the Snake River Canyon floor. The canyon's value as a farming area diminished after irrigation projects made agriculture practical in the surrounding areas in the early 20th Century. Today the canyon floor is a tourist attraction and features several parks and golf courses. In the past it was generally believed the Snake River Canyon was created by a cataclysmic flood caused by water released from Lake Bonneville approximately 15,000 years ago. However, as of 2000, geologists believe that while the canyon was shaped by the flood, its basic structure predated it.〔Topinka, Lyn. (Lake Bonneville and the Bonneville Flood ), ''Cascades Volcano Observatory'', January 22, 2003. Accessed August 18, 2008.〕 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「Snake River Canyon (Idaho)」の詳細全文を読む スポンサード リンク
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