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I I I I I I I I I I I I I I I I I I I CHAPTER V PLAN OF DEVELOPMENT a. Physical Plan. At the present time, the existing facility "Fossil Creek Dam" consists of a dam approximately 45 feet high and a mile in length with an emergency spillway and conventional outlet works. Major repairs have not been made since 1905. The structure was originally constructed in 1902. For the last few years, the deterioration of these structures has been a concern to both the owner and the Colorado State Engineer. Also, safety standards and design criteria have changed resulting in the existing structure and spillway not being acceptable to meet current safety standards. In order to maintain maximum utilization of the dam and reservoir, rehabilitation is necessary. The State Engineer's restriction presently restricts use to approximately sixty-five percent of normal capacity. Therefore, in order to restore the facility to one hundred percent efficiency, it is necessary to reconstruct the dam's front face and rip rap, rebuild the embankment, enlarge and define the spillway, and reconstruct the outlet works. (1) Irrigation: The primary function of the reservoir is irrigation water storage. This is accomplished by annual filling, refilling, and releasing water for irrigation and utilization by exchange on the Cache La Poudre River under the direction of the State Engineer's Office. Releases of water from this reservoir provide about ten percent of the water supply of the North Poudre Irrigation Compa~y's total water supply. (2) Municipal and Industrial water supply: The use of the reservoir has recently been contracted for by the Platte River Power Authority (PRPA). This use is subject to all North Poudre uses. A history and pattern has not been established, but for this analysis, 1,000 acre-feet of off season storage per year will be used. -14- .