Some Fun Facts for the Colorado Interstate System:
- Interstate first signed and showed up on Colorado maps in 1961.
- Highest point on Interstate system is at the Eisenhower Tunnel. – 11,155 feet. Also, it’s the highest vehicular tunnel in the world.
- The last section of interstate highway to open in Colorado was I-76 between Pecos Street and I-25, in September 1993. Completion of this segment marked the completion of the interstate system in Colorado.
Histories of Colorado Interstates including construction highlights and major incidents for Interstates 25, 70, 225, 76, and 270. Historic photos can be ordered from the Colorado Department of Transportation.
Search the CoSPL catalog for titles of interest on interstates