US 550

Uncompahgre River US 550 Bridge (Montrose County, Colorado)
Built 1936; replaced 2002
Lost pony truss bridge over Uncompahgre River on southbound US 550
No longer exists

US 550 Tunnel (Ouray County, Colorado)
Built 1942
Tunnel on US 550
Open to traffic

US550 Animas River Bridge (La Plata County, Colorado)
Built ca. 1910; rehabilitated 1965
Three-span arch bridge over Animas River on US 550 in Durango
Open to traffic