DAY 15 (Tuesday July 3)   Dubois, WY to Riverton, WY: 81 mi, avg speed 20.5mph. Day was intended to be mostly flat with some minor rolling hills. We averaged 22.5 mph by lunch (at 41mi), hit some head winds in the second half, along with some dry and horrid heat in mid 90s. Stopped to jump in a lake. Pictures: all VIEWS.