Denver Water: Antero Dam rehabilitation project

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Here’s the release from Denver Water (Stacy Chesney/Travis Thompson):

A project to bring Antero Dam in line with current engineering standards will begin Monday, Aug. 19. The $14 million undertaking will ensure the safety and functionality of the dam for another 100 years.

Denver Water, in coordination with Colorado Parks and Wildlife and the Office of the State Engineer, lowered Antero Reservoir by 2 feet in May 2011 as a safety precaution to reduce water pressure and seepage within the dam. The reservoir has been operating at a height of 16–17 feet since that time. Antero Dam was built in 1909 by Canfield and Shields of Greeley, and purchased by Denver Water in 1924. The dam has experienced substantial seepage since it was built and as a result, has been operating under reservoir storage restrictions by the state since the early 1900s to ensure public safety.

The rehabilitation project will be done in phases. The first phase, which begins Aug. 19, is scheduled for completion by late November 2013. During this phase, Denver Water’s contractor, Geo-Solutions, Inc., will build a sand trench to filter the normal seepage from the dam to help ensure the safety of the foundation.

Denver Water will keep the popular reservoir open to recreation, and Colorado Parks and Wildlife will continue to manage the fishery during the project. The construction will take place on the east side of the dam, which will not be accessible to the public. There will be an increase in truck traffic along Highway 9 and Highway 24 at various times during phase one as sand is brought in to complete the filter trench. Trucks will enter the site through an access road on the south side of the dam.

The subsequent phases of the project are embankment grading from May 2014 through November 2014, and spillway and valve improvements May 2015 through November 2015.

When all three phases are complete, the water levels at Antero will return to and be maintained at a level of 18 feet, which is expected to occur after spring runoff in April 2016.

Wildlife questions regarding fishing at Antero can be directed to Colorado Parks and Wildlife at 303-291-7227.

More Denver Water coverage here and here.

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