Highway 160

Wolf Creek Pass, CO

Colorado Department of Transportation: Upper Narrows Tunnel, later named for some of the most difficult highway construction in recent years in Colorado.

M. C. Donegan: Provided controlled drilling, blasting, high scaling and rock bolting installations from crane and basket operations 24 hours a day while maintaining traffic control.

M. C. Donegan: Drilling brow bolts (tunnel spillings) for tunnel excavation operations.