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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 />provi ded by install i ng a 15-foot deep parti al cutoff that extends across the <br />full length of the embankment. <br /> <br />1. 2. 2 Crest <br /> <br />The crest of the dam is roughly 20 feet wide and supports a service road along <br />its enti re 1 ength. Based on surveyi ng conducted duri ng MKE I s site <br />i nvesti gati ons, undu1 ati ons of up to 1. 4 feet exi st in the crest. A tab1 e <br />showing the results of that survey are contained in Figure V.l. Three areas <br />along the crest were noticably low. At dam station 2+00, about half way <br />between the left abutment and outlet conduit, the crest elevation was 9092.5. <br />Another low spot (elevation 9092.6) was noted along the upstream edge of the <br />crest at about dam station 3+70, which is immediately to the left of the <br />outlet conduit. The third noticeable low area was located along a distance of <br />roughly 50 feet just to the left of the emergency spillway. Elevations in <br />this area ranged from 9092.5 to 9092.9. <br /> <br />Over the years, vehicle traffic on the crest has produced minor rutting and <br />reduced any cross slope drainage that may have been built into the crest. The <br />worst rutti ng occurs in the low area to the 1 eft of the auxil i ary spi 11 way. <br />Vegetati on on the crest consi sts of sparse c1 umps of nati ve grasses. A few <br />small seedlings were noted near the left abutment and should be removed by the <br />normal maintenance program. <br /> <br />1.2.3 Upstream Face <br /> <br />The upstream face of the dam is in fair condition. The slope is approximately <br />3H to 1V and is protected with hard, generally subrounded to subangular riprap <br />approximately eight to 18 inches in diameter. The riprap was apparently <br />obtained during construction by gathering glacial erratics scattered within <br />the reservoir area. In numerous locations riprap is sparse or absent, leaving <br />the slope covered by only gravel and cobble-size rock fragments. This <br />condition is prevalent along the face at the normal high water line. The <br />upstream slope is also slightly oversteepened above this point because of <br />minor erosion. The riprap cover is especially scarce around the gate control <br /> <br />1231 H <br /> <br />-39- <br />