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00274 FOOTHILLS PROJECT The report on Future Water Supply for. Denver made in 1955 by Alvord, Burdick and Howson, Consulting Engineers recommended that water treat- ment facilities be constructed at a site just east of Roxborough Park ~pp.oxiW4t~ly taree miles sou"heast of toe Kassler Treatment Plant of the Denver Water Department. A 200 acre plant site was purchased in that area in 1956 and surveys were made to locate a diversion dam and tunnel to bring raw water from the Platte River to the site. A sur- vey was made in 1957 to locate a water conduit to transport potable water from the treatment plant to the southeastern portion of Denver. In 1962 the Denver Water Department filed an application for the Strontia Springs Dam and the tunnel from the dam to the treatment plant site with the Bureau of Land Management. This filing was approved and the rights-of-way granted in 1967. Further studies were made in 1963 by Black and Veatch, Consulting Engineers, and from 1966 to 1972 by the Denver Water Department to determine possible alternates, SiZing of the dam, tunnel and treat- ment facilities and costs involved. Additional property for the treatment plant was purchased during the period 1970-1974 bringing the total available land to 490 acres. In' 1973 consultants were employed to prepare an environmental assess- ment for the project and to begin the design for all phases of the work. The environmental assessment was submitted to the responsible govern- mental agency early in 1974. Their final draft environmental state- ment was completed in August 1975 and forwarded for review and actio~. Design is essentially complete for all facilities involved in the project, with the exception of any adjustments to be made that may be required by stipulations of the permit, when issued. The plans prepared consist of the following: 1. Strontia Springs Dam and Reservoir - Type -- thin arch,. douole cu.rvatu.re, concrete Height - 243 ft. above stream channel Crest Elev. - 6002 ft. Thickness - base - 31 ft., crest - 10 ft. Reservoir Capacity - 7600 acre ft. Surface Area - 96 acres Property Ownership Denver - 67 acres BLM - 16 acres National Forest - 13 acres Pool Length - 1.7 miles Outlet Capacity - 4000 cubic ft./second Spillway Capacity - 90,000 cubic ft./second Tunnel Intakes - multilevel tower Capacity - 1160 cubic ft./second (750 mgd)