Hoover Dam side spillway tube in Arizona. 40 foot / 12 meter diameter. “I’m sure that once you rappel down to the bottom that the pipe goes flat for about 500 yards till it meets the Colorado river… probably real good skating in that area!!!” - Matt Moose (photo/idea)

Hoover Dam side spillway tube in Arizona. 40 foot / 12 meter diameter. “I’m sure that once you rappel down to the bottom that the pipe goes flat for about 500 yards till it meets the Colorado river… probably real good skating in that area!!!” - Matt Moose (photo/idea)