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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />protected by a concrete facing which is almost <br />nonexistent today. The facing has been eroded, <br />undermined, and finally broken up by North Poudre <br />at the direction of the state Engineer. The <br />upstream and downstream slopes vary from 2 to 1 to <br />3 to 1 with the upstream slope vertical in some <br />locations due to wave erosion. <br />There are several problems which contribute <br />to the need to rehabilitate the dam impounding <br />Clark Lake. The outlet conduit has deteriorated <br />and has voids along the embankment. There is a <br />large quantity of underseepage exiting to the left <br />of the outlet wOJ:"ks at the dam toe. The upstream <br />slope protection is almost non-existent due to <br />wave erosion over the years and there are tree <br />roots in both abutments which provide the <br />potential for piping through the dam. Due to <br />these conditions, the state Engineer's Office has <br />placed a restriction on the reservoir. The <br />restriction allows for filling to a Gage Height of <br />5 feet rather tban a maximum height of 7 feet. <br />This was done to take pressure off the dam, <br />provide more freeboard, and to reduce the seepage <br />gradient through the dam. <br /> <br />V-2 <br />