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<br />OQO!cn <br /> <br />yield and was calculated assuming instream flows, flushing flows, and bypasses <br /> <br />for senior water rights are maintained. The estimated 1980 cost to construct <br /> <br />the Battle Creek to Jack Creek Pipeline is $77,200,000. <br /> <br />2. Jack Creek Reservoir <br /> <br />The proposed Jack Creek Reservoir would be utilized to impound <br /> <br />water diverted into Jack Creek by the Battle Creek to Jack Creek Pipeline. Jack <br /> <br />Creek Reservoir would be used to regulate releases to the municipal water users <br /> <br />needing additional supply. The proposed reservoir would be located in the <br /> <br />Medicine Bow National Forest on the east side of the continental divide. The <br /> <br />location of Jack Creek Reservoir is shown on Plate 4. <br /> <br />The Jack Creek darn site is located in an area where Jack Creek <br /> <br />has cut a V-shaped valley through the pre-Cambrian granites of the Sierra Madre <br /> <br />Mountains. The bedrock at the darn site consists of pink to red granite and <br /> <br />granite gneiss. The valley bottom is flat and filled with 15 to 20 feet of al- <br /> <br />luviurn consisting of clay and coarse gravel and boulders. <br /> <br />Jack Creek Darn would be a zoned earthen embankment with a maximum <br /> <br />height of about 200 feet above the streambed. The darn crest will be 30 feet in <br /> <br />width, approximately 1500 feet in length. The top elevation of the darn will be <br /> <br />elevation 8475. In addition a saddle dike will be constructed on a low area on <br /> <br />the left abutment. The dike will be approximately 1500 feet in length with a <br /> <br />maximum height of approximately 30 feet. The resulting reservoir would impound <br /> <br />38,410 AF of water, including 250 AF of dead storage. <br /> <br />A spillway, consisting of a 25-foot long side channel structure, <br /> <br />would be constructed to bypass 600 cfs, The combination of spillway and flood <br /> <br />surcharge capacity will handle the Probable Maximum Flood. The outlet works <br /> <br />will be capable of releasing 700 cfs which would be composed of the natural in- <br /> <br />flow of Jack Creek and releases of imported water. The outlet works and spill- <br /> <br />way will discharge into separate hydraulic jump type stilling basins. <br /> <br />VI-6 <br />