How the old Grand Avenue bridge will be taken apart | PostIndependent.com

How the old Grand Avenue bridge will be taken apart

Tom Newland

Crews will stage machinery on the north and south causeways in the Colorado River in order to remove concrete, steel and rebar during deconstruction of the existing Grand Avenue bridge.

How will the old Grand Avenue bridge be deconstructed?

The existing bridge will close at 12:01 a.m. next Monday. That begins the approximate three-week deconstruction schedule and removal process.

Similar to the pedestrian bridge, the old bridge will be deconstructed in pieces. A specialty team will mobilize over the weekend leading up to the shutdown. About 15 track hoes and loaders, 400-ton cranes and munchers (concrete processors) will be staged on the north and south causeway, in the Hot Springs Pool parking lot, along Seventh Street and in the lane closures on the bridge.

Early Monday morning, crews will sawcut deck slabs through the bridge deck and begin to lift pieces of the deck from the south back to Eighth Street. The concrete will be processed into pieces by the munchers and loaded into waiting dump trucks for removal to a recycling facility in Rifle.

Once the bridge deck is removed, crews will remove the existing girders off the piers and onto waiting semis below. The girders will then be taken to be recycled.

Next is the removal of the center pier in the Colorado River. This process is extremely intricate due to its environmentally sensitive location in the middle of the river. This step will take several days.

There is no doubt, the first few weeks of this deconstruction process will be noisy and will have a high level of constant activity. Crews will be working 24/7, lights will illuminate the work area and lots of large machinery will be moving continuously. More than 200 cubic yards of concrete, plus steel and rebar, will be removed from the job site during this time. The schedule has been vetted, reviewed and planned by teams of managers, engineers and professional deconstruction crews to be as efficient as possible with the detour in place.

Crews will also be working on the north portion of the traffic bridge. Materials will be removed via Sixth Street.

Once the old bridge is removed, crews will focus on forming the remaining south piers and abutment between Seventh and Eighth streets. Once the piers have cured, our girders will arrive and the structure will come to life (late August, early-September).

Traffic Impacts

• Beginning as early as 7 p.m. Friday, Aug. 11, the bridge will be reduced to one lane in each direction, continuing until the closure.

• On Monday, Aug. 14, the Grand Avenue bridge will be closed. Motorists should use the Midland Avenue detour for access to Interstate 70 and downtown Glenwood Springs.

From 8 p.m. to 6 a.m. Monday, Aug. 14, through Sunday, Aug. 20, I-70 night detours to Sixth Street will be in place.

• Eastbound I-70 traffic west of Exit 114 will exit at Exit 116, detour to Sixth Street and return to I-70 via a break-in-barrier.

• Eastbound I-70 traffic in Glenwood or Roaring Fork Valley will navigate the detour, enter eastbound I-70 at Exit 114, get off the interstate at Exit 116, detour to Sixth Street and return to I-70 via a break-in-barrier.

• Westbound I-70 traffic will detour via a break-in barrier on east Sixth Street to Exit 116 and continue on I-70 or exit at Exit 114 for access to Glenwood Springs and the Roaring Fork Valley.

RIVER CLOSURES

No Name, Grizzly Creek and Shoshone put-ins along the Colorado River will be closed to private trips beginning Monday, Aug. 14, for approximately 10 days. Call or text 970-618-9897 for Colorado River status before you float.


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