Your only luck will probably be either Gore Canyon (if you can handle it in a small boat) or what is probably the best idea is Shoshone/Barrel Springs. It is litally on HWY 70 (basically your only straight way through the rockies of Colorado) and the shuttle is a sinch. Only problem is that it is short, but can be run several times.
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body. But rather...To skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming... WOW !!!! What a ride!!!!!!"