Location Approx. 50 mi (80 km) west of Denver, Colorado
Coordinates 39.6785°N 105.92°WCoordinates: 39.6785°N 105.92°W
Route I‑70
Operation
Opened 1973 (westbound)
1979 (eastbound)
Operator Colorado Department of Transportation
Character Twin-bore tunnel
Vehicles per day 32,260 vehicles (2007)
Technical
Length 1.693 mi (2.72 km) westbound
1.697 mi (2.73 km) eastbound
Highest elevation 11,158 ft (3,401 m)
west portal
Lowest elevation 11,013 ft (3,357 m)
east portal
Tunnel clearance 13.92 ft (4.24 m)
Width 40 ft (12.2 m) each
Grade 1.64%