Highway 160

Wolf Creek Pass, CO

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


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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.


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


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