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<br />l') f'.. (' <br />....\.>'" ,,) <br /> <br />PART IV--PIAN OF DEVELOIMENT <br /> <br />The principal feature of the unit is the Narrows Dam and Reservoir <br />to be constructed on the South Platte River near Fort Morgan, Colo. <br />Also proposed is the acquisition of the existing Jackson Lake and <br />rehabilitation of the dam for recreation and fish and wildlife enhance- <br />ment. Locations of these facilities are shown on the general map, <br />exhibit 1. No Federal construction of irrigation distribution <br />facilities would be involved, since reservoir releases would be carried <br />by existing irrigation systems. <br /> <br />During feasibility investigations, other features were studied <br />as potential additions to the plan of development. These include the <br />Bijou Creek Diversion Channel to provide control of floods originating <br />on Bijou Creek; the Riverside, Bijou, and Sterling Pumping Plants; and <br />the Ovid Well Field. Descriptions of these potential additions are <br />presented subsequently in this part of the report. <br /> <br />No provisions for hydroelectric power development have been <br />included since the conditions which rendered this potentiality infea- <br />sible as determined in the 1951 Definite Plan investigations, have <br />not changed. <br /> <br />Municipal and industrial water supply has not been included as <br />a unit function for lack of any forseeab1e need as described <br />subsequently. <br /> <br />NARROWS DAM AND RESERVOIR <br /> <br />The Narrows Dam site is located in Sections 7 and 18, T. 4 IT., <br />R. 58 W. and Sections 13, 23, 24, 25, and 26, T. 4 IT., R. 59 W., about <br />7 miles northwest of Fort Morgan. The location of the damsite with <br />proposed railroad and highway relocations is shown on exhibit 2. <br /> <br />Geology of Damsite <br /> <br />Types of subsurface materials of importance at the Narrows Dam <br />site are alluvial valley-fill sand, terrace silt, and Pierre shale <br />bedrOCk. The present South Platte River channel. has eroded into <br />the north wall of the older and much deeper channel, the thalweg of <br />which lies approximately 3 miles to the south. The alluvial sand <br />with which this ancestral channel is filled is exposed below the high- <br />water level in the reservoir area. Since the sand has a significant <br /> <br />14 <br />