I-70 Twin Tunnels Environmental Assessment

The Federal Highway Administration (FHWA) and the Colorado Department of Transportation (CDOT) have prepared this Environmental Assessment (EA) documenting analysis under the National Environmental Policy Act for the Twin Tunnels project. The purpose of the project is to improve eastbound highway safety and mobility in the Twin Tunnels area of Interstate 70 (I-70) in Idaho Springs and Clear Creek County, Colorado. FONSI included.