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<br />. <br /> <br />PART III--PLAN OF DEVELOPMENT <br /> <br />, <br /> <br />The potential Idylwilde Dam and Reservoir was the only feature <br />considered for construction in the feasibility investigations, The <br />dam, as designed, would form a reservoir to store and regulate the <br />surplus flows of the Cache la Poudre River primarily for municipal <br />and industrial use, The reservoir could also be used for recreation <br />and for conservation of fish and wildlife, No flood control storage <br />could be justified, <br /> <br />IDYLWILDE DAM AND RESERVOIR <br /> <br />Idylwilde Dam site is located in Section 34, T,9N" R,74w" in <br />Larimer County in north central Colorado, about 45 miles northwest of <br />Fort Collins on State Highway No, 14, The location of the damsite is <br />shown on the General Map, Exhibit 1. <br /> <br />Geology of Damsite <br /> <br />. <br /> <br />The damsite is located near the downstream terminus of a glacier <br />which formerly occupied the upstream reaches of the river canyon. The <br />containing slopes of this valley are generally precipitous and dissected, <br />and are a combination of granite and schist, The several gulches and <br />stream valleys tributary to the valley are headed by alluvial fans which <br />were formed as the result of the normal erosional processes of the <br />valley slopes being interrupted. The alluvial fans consist of materials <br />which grade from coarse debris to sands and fines, In some instances, <br />these alluvial fans contain deposits suitable for embankment fill <br />material, Underlying the alluvial fans are pervious river depositions <br />consisting of mixtures of gravel and sand, <br /> <br />Bedrock at the damsite is extensively exposed at the left abutment <br />and at the middle and upper portion of the right abutment, The abutments <br />consist of hard gneissic schist that is moderately to severely jointed, <br />In evidence also are numerous intrusions (dikes, sills, and irregular <br />masses) of granitic materials, At the damsite, glacial erosion and <br />removal of weathered bedrock by other natural forces does not appear <br />to be severe, But even so, the weathered zone is probably relatively <br />thin insofar as permitting leakage through the foundation is concerned, <br />No strongly developed faults or shear zones were discovered, <br /> <br />The overburden at the damsite appears to consist principally of <br />relatively pervious sand, gravel, and boulders, <br /> <br />. <br /> <br />6 <br /> <br />