Colorado business loop 70
1970 specification highway marker.
Westbound Business Loop I-70 (former U.S. 6-40) in Idaho Springs.
Photo by Andy Field, 9/1/2004.
1970 specification highway marker.
Westbound Business Loop I-70 (former U.S. 6-40) in Idaho Springs.
Photo by Andy Field, 9/1/2004.