In 1974, Evel Knievel tried to jump over the Snake River canyon in a steam-powered rocket.

FORBES: Bold Prediction: Android Will Own 38.6% Of Tablet Market In 2015

Seven years later he almost drowned while failing to jump the Snake River Canyon, a quarter-of-a-mile wide, in Idaho.

ECONOMIST: Evel Knievel

Jackson Hole Whitewater organises half day excursions on the class III Snake River with some big rapids through the limestone cliffs of Snake River Canyon.

BBC: The best of the West in Jackson Hole