The northwestern extension extends from the historic mining town of Leadville over Tennessee Pass to Interstate 70 near Minturn.

The northeastern extension extends from Leadville over Fremont Pass to I-70 at Copper Mountain.

History Colorado operates the Healy House Museum and Dexter Cabin in Leadville.

The byway starts in Aspen, traveling on SH 82 east over Independence Pass and near the Twin Lakes to just north of the town of Granite.

A spur of the byway continues along the entire length of SH 91 from Leadville to Copper Mountain, through Fremont Pass.