US 6 CLEAR CREEK ROCKSLIDE

Clear Creek Canyon, Colorado

A rockslide comprising some 1,500 cubic yards of rock material swept across two-lane US 6 in Clear Creek Canyon , Colorado . The slide partially inundated two gravel haul trucks and a passenger car. The debris completely covered the roadway some 15-ft high. No one was injured in the incident.

Lyman Henn provided emergency field engineering and construction oversight during repair of this major rock slope failure. Services included geotechnical and rock slope engineering to the emergency repair team. Lyman Henn determined the mode and probable cause of the failure and assisted in determining stabilization measures for the remaining slope. Stabilization included 40,000 cubic yards of rock excavation, scaling, rock bolting, placing 60,000 square feet of wire mesh rock fall protection and 1,000 tons of asphalt. Lyman Henn worked closely with CDOT to evaluate design options with regard to constructability, long-term stability and maintenance and cost/schedule impacts on the emergency construction.

Lyman Henn provided full-time field engineering support during emergency construction. Tasks included consultation on rock blast designs, recommendations for scaling and rock bolting of cut faces, construction observation and field testing oversight of rock bolts.

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