Glenwood Springs to replace Three Mile culvert
Post Independent Editor
Glenwood Springs, Colorado CO
GLENWOOD SPRINGS, Colorado – A five-week project to replace the aging and partially collapsed Three Mile Creek culvert on South Midland Avenue is slated to begin Tuesday, Sept. 4.
The project entails removing an old eight-foot metal culvert and replacing it with a pre-cast concrete box culvert 12 feet wide and eight feet tall, said Terri Partch, Glenwood Springs city engineer.
The new culvert, as well as the old concrete bridge it will tie into under the centerline of the road, will be capable of handling highway-weight trucks.
“If it can run on a highway, it will be legal here,” said Partch, including logging trucks, gas drilling rigs and service trucks.
The new culvert is sized to carry creek flows of 710 cubic feet per second, comparable to a flood that could be expected once in a century, she said.
Road width will remain about the same, 23 feet, with a guardrail on the west side and a concrete barrier separating the road from the walking path on the east side.
Gould Construction Co. of Glenwood Springs holds the $238,250 construction contract. The project was designed by Adolfo Gorro of Glenwood Structural and Civil Inc.
Scheduled for Sept. 4 through Oct. 9, the project will narrow traffic to one lane between Mountain Market and Mount Sopris Drive during all or parts of the day, said Partch.
Work is slated for 7 a.m. to 5 p.m. six days a week.
For the first two weeks of the project, both lanes of Midland will remain open through the morning rush hour for traffic headed to and from Sopris Elementary School. Alternating one-lane travel will be imposed for the rest of the day, and all day for the last three weeks of the project.
For about 10 days at the middle of the project, one-lane travel will be imposed around the clock, controlled by temporary stoplights placed north and south of the project area.
The sidewalk on the east side will remain open for cyclists and pedestrians.
Once the old culvert is excavated, Gould crews will use a crane to swing the precast concrete box culvert into place. Using a culvert built offsite is one of several methods being used to limit the overall project time.
Crews will also drill micropiles into the surrounding roadway to stabilize it during the excavation work. The piles will allow for a smaller footprint for the excavated area, and save time for rebuilding the road area once the culvert is in place, Partch said.
City officials had originally hoped to carry out the culvert replacement project during the summer months to avoid the heavy morning and afternoon traffic to and from Sopris Elementary School.
“We had issues with contracts and getting the work moving, including staff changes,” said Partch. She started her job as city engineer on March 12, and her first day on the job she was out looking at the Three Mile Creek job.
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