The new 90,000 acre-foot water storage reservoir will be retained by a 360 foot tall rockfill dam
This Chimney Hollow Reservoir Project is needed to firm water supply for 400,000 residents in northern Colorado, through partnership with 12 public agencies.
We are providing complete engineering and design of the Chimney Hollow Reservoir Project. The project consists of an approximately 360-ft tall hydraulic asphalt core rockfill main dam, 40-foot-high zoned rockfill saddle dam, inlet/outlet works in a tunnel in the right abutment, and uncontrolled concrete spillway. It also requires large diameter conveyance piping and valve house to tie into the US Bureau of Reclamation’s Colorado-Big Thompson Project, as well as access roads.
Our scope of work includes geotechnical investigations, evaluation of alternatives, complete engineering analyses, preparation of intermediate and final designs, preparation of bid documents, support during bidding, and engineering services during construction. The work includes a large test quarry and test fill to evaluate the rockfill properties for final design.
The Northern Colorado Water Conservancy District Subdistrict obtained all required Federal Permits for the project. When complete, the main dam will be one of the largest in Colorado.
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