Pitkin County

Busk-Ivanhoe Tunnel
Built 1891; converted to highway use 1922; closed to traffic 1943
Maroon Creek Bridge   [Map · Street View]
Trestle over Maroon Creek on CO 82 at Aspen
Bypassed by a replacement bridge and left in place for pedstrian use.
Built 1888; converted to vehicular use ca. 1929. Bypassed in 2005.
Sheely Bridge   [Map]
Through truss bridge in Mill Street Park in Aspen
Open to pedestrians only
Built 1911; relocated in 1966