The bridge is roughly 500 feet above the Snake River that runs through Twin Falls. This gallery has the pix of basejumpers jumping off the brige, the nearby scenery, and a shot of the ramp Evil Knevil used in his attempt to cross the Snake River. The BASE in BASE Jumping is the acronym for Building, Antenna, Span, Earth, basically anything attached to the earth from which a jump can be made, usually using a parachute that can be steered.