GLENWOOD CANYON – The Colorado Department of Transportation begins repairs today on damage caused by the rockfall incident on I-70 in Glenwood Canyon on March 8. Flatiron Construction Corporation of Longmont will be making the repairs. The cost of the repair project is approximately $860,000. However, the total cost of the rockfall event—including CDOT maintenance and design work—is expected to be much higher (that figure will be reported at a later date).
Because of the critical need to expedite repairs on the interstate, the contract carries with it a $5,000/day incentive for early completion (with $5,000 deducted each day the work runs past their set completion date). Flatiron Construction, in its bid package, set a completion date of May 15; the company can earn a maximum of $31,000 in early-completion incentives by beating this projected date.
The repair work is taking place between mile markers 124 and 125, just west of Hanging Lake Tunnel. The work will involve bridge deck and bridge wall/rail repairs (including 150 feet of new steel bridge rail) ; guardrail repairs (about 120 linear feet) to hillside concrete barrier; median concrete barrier repair (replacement of 400 linear feet) ; removal and replacement of 690 square feet of concrete retaining walls; straightening of steel bridge girders using a flame straightening process; some lighting and electrical repairs; and repairs to the bike trail below. Finally, the contractor will use approximately 500 tons of base course material on the roadway, as well as 400 tons of patching asphalt to repair the driving surface.
TRAFFIC IMPACTS: Work will be done during the day, Monday through Saturday. There will be a single lane of traffic open in each direction, but motorists may encounter occasional traffic stops, when safety or equipment mobilization warrant. The speed limit is reduced from 50 to 40 mph; delays should be very minimal. Motorists are urged to obey the reduced speed limit and maintain a safe following distance while driving through the work zone. There is a 14-foot width restriction. While the Glenwood Canyon bike path should open sometime in April, the section between the Shoshone power plant and Hanging Lake rest area will remain closed for safety until the project is completed in May. Thank you for going “Slow for the Cone Zone! ”
ROCKFALL INCIDENT INFORMATION: Just after midnight, on March 8, a large rockslide hit I-70 in Glenwood Canyon near mile marker 125, just west of Hanging Lake Tunnel. I-70 was closed in both directions to all traffic between Glenwood Springs (mm 116) and Dotsero (mm 133). The interstate reopened to a single lane of traffic in each direction on the afternoon of Thursday, March 11.
The rockfall brought 20 boulders onto the interstate, ranging in size from 3 feet to10 feet in diameter. The largest weighed about 66 tons. The rocks made holes in the elevated sections of roadway—the largest being in the westbound lanes (closest to the hillside) and measuring 20 feet by 10 feet. Another hole in the lower eastbound lanes measured 6 feet by 6 feet. There were a half a dozen other holes and “dips” in the roadway, as well as areas where rocks were embedded. Most of these repair areas were approximately 5 feet by 5 feet. Rocks were scattered over 100 yards of roadway. Also damaged were three sections of steel guard rail and median barrier.
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