the only route i know is on the colorado trail. it's a bit of a round-a-bout though since it first goes north toward copper mountain before turning east to breck. drawing a straight line in google earth shows a distance of 21 miles and a path that follows just east of CO 91 north to freemont pass and then it continues north crossing the Breck Marathon course twice. also this path goes through the climax mine which they may not like.