Rockfall work starts Monday on McClure Pass |

Rockfall work starts Monday on McClure Pass

Post Independent
Glenwood Springs, CO Colorado

REDSTONE, Colorado – The Colorado Department of Transportation will begin a project on Monday to reduce the potential for rockfall on Highway 133 over McClure Pass.

The work will be done on weekdays and some Saturdays during daylight hours from Sept. 17 through Nov. 1, and again from April to July 2013.

CDOT contracted the work to TK Mining for $2 million.

Traffic may be stopped in both directions for up to 20 minutes. Delays may exceed 20 minutes as traffic queues are cleared in both directions. Travelers can also anticipate shorter delays and single-lane, alternating traffic during work hours.

The rockfall mitigation involves clearing rock debris from the roadside ditch, scaling rock from the hillside by inserting air bags behind loose rock and prying by hand, installing rock reinforcement with dowels and a concrete mixture, and anchoring and installing wire mesh or cable netting to contain smaller rocks.

The work will be done on the north side of the pass, between Redstone and Marble, between mileposts 44 and 49.

“McClure Pass is ranked at the top of our rockfall hazard rating system,” said Ty Ortiz, CDOT rockfall specialist. “The amount of rockfall we see here on an annual basis is quite a bit higher than what we see in many other sites around the state.”

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