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. . . . COLORADO WATER CONSERVATION BOARD 823 State Centennial Building 1313 Sherman Street Denver, Colorado 80203 January 6-7, 1983 Great Western Dam (City of Broomfield) Introduction The Great Western Dam is an earthfi11 dam located on Walnut Creek about 5 miles southwest of Broomfield. The dam was con- structed in 1904 by the Great Western Reservoir and Canal Company. The original dam had a maximum height of 35 feet and a crest length of 950 feet. OVer the years the dam has been enlarged and rehabilitated. TOday the maximum height is 60 feet and the cre.st length is approximately 1,900 feet. The reservoir currently has a capacity of 3,260 acre feet. The dam and reservoir were purchased by the city of Broom- field in 1963. Currently the reservoir is used to store water for the city's municipal raw water supply. Problem As a result of a dam safety inspection in 1981, the State Engineer's office has issued an order requiring that Broomfield enlarge the spillway of the Great Western Dam. In addition, the reservoir's storage capacity needs to be increased to avoid shortages in the city's current water demands and to satisfy even greater future water demands. For these reasons a dam enlarge- ment and rehabilitation project has been proposed. project Study In August, 1982, the city of Broomfield submitted its appli- cation to the Board. The Board subsequently approved funds for a feasibility study on the project. That study has now been completed by Hydro Triad, Ltd., and is the basis for the recommendation on this project. Proposed project The consultant studied several alternatives for this project concluded that the most viable one would be to construct a spillway and enlarge the existing reservoir. The proposed and new 600 Grt/West/dam