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<br />- ~..- ", <br />\..i~{ ; <br /> <br />The South Platte River Valley in the Narrows area has been ravaged <br />by floods many times. Significant floods of record occurred in 1844, 1864, <br />1867, 1876, 1894, 1921, 1933, 1935, 1965, 1969, and 1973. The Narrows <br />Reservoir will reduce flood damages in the valley downstream by an ,average <br />of $800,000 annually, as' estimated by ,the Corps of Engineers, Department <br />of the Army. Floods from Bijou Creek will not be controlled by Narrows <br />Dam and Reservoir. ' <br /> <br />The National Park Service has prepared a recreation plan for the unit.' <br />The Fish and Wildl ife Service similarly has formulated a plan to compensate <br />for habitat losses and enhance fish and wildlife resources of the area. <br />Both plans have been reviewed and approved by appropriate State agencies <br />and have been incorporated to the extent possible under the authorization. <br /> <br />The basic Narrows Reservoir that will be needed for irrigation and <br />flood cor.trol will, by itself, provide substantial recreation and fish- <br />wildlife values. However, these basic values will be increased <br />SUbstantially by the acquisition and stabilization of the water surface <br />of adjacent Jackson Lake, by the acquisition of additional lands, by the <br />use of some basic reservoir rights-of-way lands for fish and wildlife and <br />recreation purposes, and by the construction of specifiC recreation <br />facll i ti es. <br /> <br />WHAT ARE THE FEATURES OF THE UNIT? <br /> <br />Dam'and Reservoir <br /> <br />The Narrows Dam ~ill be an earthfill structure. In order to provide <br />a solid dam foundation and control reservoir seepage under the north and <br />part of the south abutment, the native soil, consisting primarily of silts, <br />sands, and gravels will be excavated to bedrock (Pierre Formation) and <br />backfilled with impervious materials. The upstream face of the dam will <br />be protected by rock riprap or soil cement. The downstream face will be <br />covered with 12 inches of topSOil and seeded to grass. <br /> <br />Two separate spillways will be required to handle antitipated floods-- <br />a gated concrete lined service spillway will discharge controlled floods <br />back to the river. In addition, an emergency spillway designed to handle <br />extremely large floods will be built on the north abutment of the dam. <br />An outlet works for releasing stored water to the river will be located <br />on the north side of the dam. An outlet to the Fort Morgan Canal will be <br />located on the south side of the dam. <br /> <br />2 <br />