One lane of I-70 in canyon opens; hours are limited

Daylight on Feb. 16 revealed semis stuck in Glenwood Canyon, and one severely damaged, after a massive rockfall on Interstate 70 about 8 miles east of Glenwood Springs at mile marker 124.
Colorado Department of Transportation |


• We really do live in the mountains.

• Rockslide closures not that common.

• Drivers mistakenly head for Indy Pass.

Origins of the route, how it’s monitored.

A single lane of Interstate 70 through Glenwood Canyon is to be open for limited hours the next few days with traffic led in alternating directions by pilot vehicles, the Colorado Department of Transportation said late Sunday afternoon.

The pilot-car operation began Sunday evening, but the road was to be fully closed again at 9 a.m. today until 4 p.m. for more safety work, CDOT Communications Director Amy Ford said in a media briefing late Sunday afternoon.

The plan for a few days — CDOT can’t say yet precisely how long — will be for pilot vehicles to lead traffic through between 4 p.m. and 9 a.m. CDOT will close I-70 entirely from 9 a.m. to 4 p.m. during this period to allow more rock removal and longer-term rockfall mitigation work.

The road had been closed since the evening of Feb. 15 because of a rockslide, the longest such closure in the history of I-70 through the canyon.

“People driving through there will see a lot of rock still on the roadway” that must be blasted to break it apart and then be hauled away, Ford said. Additional fencing will be erected, and helicopters will be flying in equipment during the day.

The reopening is tenuous, and bad weather, such as the snow and rain forecast early in the week, could result in additional closures, according to Ford and David Eller, CDOT Region 3 program engineer.

Ford said CDOT crews brought down about 400 tons of rock in the past week after the Feb. 15 rockslides.

Ford said crews on Sunday finished clearing a “rock nest” that was of major concern. Workers broke up three boulders of 2 to 5 tons each Sunday, allowing agency officials to feel confident enough about safety to approve the limited reopening.

For the pilot car operation, eastbound and westbound traffic will be led in alternating fashion by pilot cars through a 6-mile zone on a single eastbound lane between the Grizzly Creek Rest Area and the east side of the Hanging Lake Tunnels.

The pilot-car operation is likely to be in place for several days as CDOT crews continue to assess the extent of damage and begin to make repairs. The damage has been estimated in the range of $2 million to $5 million.

When pilot cars are running, eastbound I-70 traffic will be down to one lane from Exit 116 in Glenwood Springs to the Grizzly Creek rest area, where a pilot car will lead traffic for 6 miles through the rockfall area, CDOT Region 3 spokeswoman Tracy Trulove said.

Westbound traffic will go to one lane at the Bair Ranch rest area (mile marker 129) and will meet the pilot car just east of the Hanging Lake Tunnels, she said.

Vehicles wider than 10 feet will not be permitted on the road during the pilot-car operations, Ford said.

The other eastbound lane may appear to motorists to be driveable but will be closed to the public and reserved for highway crews and emergency access. People are asked not to get out of their cars and walk around while waiting for the pilot car.

“We want to encourage people to remain safe and stay in their cars,” Trulove said.

Motorists should expect up to hourlong delays getting through the canyon while the pilot cars are operating, especially during peak times when CDOT sees around 300 vehicles per hour pass through Glenwood Canyon. Eller said the road will close at 9 a.m. each of the next few mornings, so drivers who haven’t gotten through by then are out of luck.

After the interstate is reopened to free-flowing traffic, it is likely to be limited to two-way, head-to-head traffic in the eastbound lanes for a period of time while repairs are being made to the elevated westbound section. Motorists also should expect occasional delays as permanent rockfall-mitigation work continues, Ford said.

While the road is closed during workdays, cross-state motorists are still asked to take one of two detour routes around Glenwood Canyon, to the north via U.S. 40 and state Highways 13 and 9, and to the south via U.S. Routes 50, 24 and 285. I-70 remains open to local traffic only between Glenwood Springs and Rifle and east of the canyon between Dotsero and Wolcott.

Last week’s closure is the longest to date of I-70 through the canyon. The previous longest such incident was in March 2010, when the road was closed for three days.

“I think the sheer amount and type of rock coming down” was the reason for the length of the closure, Ford said by email. “It turned into a more continuous event given the nature of rock scaling that was necessary. The others had something similar but more of a first incident, and then it was cleanup and repair.”

After the big slide Feb. 15, lesser rockfall occurred through the week, including a small slide farther west Thursday morning that knocked out electrical power in No Name. High winds, rain and sleet Thursday slowed work to remove loose rocks that appeared to be in danger of falling.

The massive amount of rock that fell or was intentionally removed from the canyon wall will have a future life, Eller said, either as riprap or by contractors for various projects.


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