The eastbound tunnel is 1001.0 feet (305 m) in length; the westbound tunnel is 949 feet (289 m). Both have 41 ft (12.5 m) of horizontal and 15.58 ft (4.75 m) of vertical clearance. The eastbound tunnel was completed in 1969; the westbound finished a year later. There is a six percent grade through the tunnels.
Information From Wikipedia entry on Vista Ridge Tunnels
Dimensions
Total length: 1,001.0 ft.
Deck width: 41.0 ft.
Vertical clearance above deck: 15.6 ft.
Approximate latitude, longitude
+45.51599, -122.69844(decimal degrees) 45°30'58" N, 122°41'54" W (degrees°minutes'seconds")