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18 . I'AONIA l;'~OJECT" COLORADO of water now used on such lands from tributary streams; and for rendering incidental flood:control benefits in the North Fork River Valley.. To accomplish this general plan the following three project features are contemplated for Federal construction: Estimated cost 1 A. Dam and appurtenant works to impound 14,000 acre-feet of water in a reservoir at the Spring Creek site on East Muddy Creek__n $1,050, 000 B. Enlargement of Fire Mountain canal to a capacity of 165 second- feet at the head, and extension of the canal west of Leroux Creek to serve arable land on Rogers Mesa___nnn____n__ C. Enlargement of Overland canal from Leroux Creek to Redlands Mesa to a capacity of 140 second-feet at the head_ _ _ _ n n _ _ __ 461,000 40, 000 Total estimated cost ofprojecL___ __ _ __n _____ __ ___n_ ___ 1, 551,000 1 Based on January 1940 construction prices. Spring Creek Reservoir The reservoir site is located on East Muddy Creek 22 miles upstream from Paonia. A branch of the Denver & Rio Grande Western Rail- road serves the coal-mining camp of Oliver, 10 miles down the canyon from the site. The first 5-mile stretch between the railroad terminus and the dam site is gravel road maintained by the State and the remainder is unimproved canyon road. Storage water will be released directly into East Muddy Creek and conveyed in the natural channel . to the North Fork River from where it will be diverted for irrigation by the Fire Mountain canal. The dam will be a rolled earth-fill structure. A concrete-lined tunnel through the right abutment will divert the stream flow during. construction. After construction a 42-inch emergency gate will be installed in a gate chamber and a 42-inch steel pipe will convey water to a 36-inch needle valve at the downstream end of the tunnel for controlling reservoir releases. The spillway will be a concrete-lined channel around the left abutment, with the crest controlled by radial gates. Other design characteristics of the dam and appurtenant works are as follows: Elevation of top of damnnn__n__n___________nn._ 6,776 feet. Maximum height of dam_________n_nn___nn____n 126 feet. Embankment volume_cnn____________nnnnn____ 490,000 cubic yards. Crest length of damn________nn_n_n_n_________n 800 feet. Elevation maximum water surface_n________n_nn___ 6,769 feet. Active capacity of reservoir_n________nnnn________ 13,000 acre-feet. Dead storage capacity of reservoir _ _ _ _ _ _ _ _ n _ _ _ _ _ n _ _ __ 1,000 acre-feet. Outlet capacity__n__nn____n________n_n_nn____ 300 second-feet. Spillway capacityn__n_____n__ ___ _ ____ _n __ n___ ___ 10,000 second-feet. Abundant well-graded embankment material of a sandy clay nature containing sandstone fragments and felsite boulders is available within a I-mile haul of the dam site. Sandstone at the dam site is too soft and friable for good rip-rap material but sufficient igneous boulders can be screened from the embankment material for facing the dam and for rock fill. Suitable concrete aggregate can be obtained from the North Fork River bed with a haul of not more than 20 miles. Nineteen other reservoir sites on the North Fork River watershed were given consideration and rejected as inferior to the Spring Creek site. Provision jor reserve storage capacity The ultimate requirement for storage water in the North Fork' River Valley has been considered in the design of capacity for the Spring Creek Reservoir. Future domestic and industrial use in the