Laserfiche WebLink
<br />I <br /> <br />I <br />I <br />I <br />I <br /> <br />EXECUTIVE SUMMARY <br /> <br />I <br />I <br /> <br />Jackson Lake Reservoir and Irrigation Company owns and operates Jackson <br />Lake Reservoir. The dam and reservoir were constructed in 1905 for the purpose of <br />storing an irrigation water supply. The dam embankment is approximately two miles in <br />length, has an upstream side slope ranging from 1.6 to 1.8 (horizontal) to 1.0 (vertical), <br />a downstream side slope of approximately 2.0 (horizontal) to 1.0 (vertical), and has a <br />maximum structural height of approximately 20 feet. The dam is homogeneous earthfill <br />consisting of sand and clayey sand. <br /> <br />I <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />The upstream embankment slope protection consists of several layers of <br /> <br /> <br />concrete slab. The slabs have deteriorated with freeze-thaw action, wave impact and <br /> <br /> <br />age to the point of requiring continual maintenance, and the possibility for localized <br /> <br /> <br />failure of the facing material is present. <br /> <br />W. W. Wheeler and Associates has evaluated several options for repair of the <br />upstream slope of the embankment. These options include resurfacing with concrete <br />slabs, a soil cement overlay, an armored beach slope, and conventional riprap armoring. <br />The recommended repair alternative is Option 4-6, Resurface the Upstream Slope with a <br />Soil Cement Overlay. The proposed project includes placement of horizontal layers of <br />soil cement against the existing concrete facing up to an elevation of 36,5, to the base <br />of the parapet wall, and an option for an investigation for voids underlying the existing <br />concrete facing and repair of voids found. With the funding limits of approximately <br />$3 million, the expected length of slope repair is approximately 8,100 feet. The area to <br />be resurfaced includes essentially all documented sites of sink hole formation on the <br />dam crest. <br /> <br />I <br />I <br />I <br />I <br /> <br />Project funding will be provided by Jackson Lake Reservoir and Irrigation <br />Company and the Colorado Department of Parks and Outdoor Recreation, with both <br />entities seeking construction loan money from the Colorado Water Conservation Board, <br />Jackson Lake Reservoir and Irrigation Company has the ability to repay the principal and <br />