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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 />INTRODUCTION <br /> <br />Barnes Meadow Dam is an earth embankment dam with a maximum height of 51 feet <br />and a crest length of 1,260 feet at elevation 9093.2. It impounds a <br />reservoir, when full, of 2,349 acre-feet at the normal water surface elevation <br />of 90B7. A 25-foot wide concrete-lined service spillway is located in a <br />sadd1 e southwest of the mai n dam, with a control e1 evati on of 9087. The <br />service spillway is flanked 100 feet to the left and 150 feet to the right by <br />an auxil iary spillway consisting of a riprap-protected overflow dike with a <br />crest elevation of 9088. A 180-foot wide emergency spillway is located within <br />the main dam adjacent to the right abutment at elevation 9090. The dam is <br />located on a small unnamed tributary to the Joe Wright Creek, approximately <br />three miles upstream of the confluence with the Cache 1a Poudre River and six <br />miles upstream of the Spencer Heights R~sort. The dam was constructed in 1923 <br />by the Mountain and Plains Irrigation Company for irrigation supply. The dam <br />has been repaired and modified over the years, most significantly in 1973 when <br />the crest was raised approximately 13 feet, a service and auxiliary spillway <br />were added, and in 1985 and 1986 when the outlet works was repaired. The dam <br />has been inspected periodically by the City and by the Colorado State <br />Engi neer' s Offi ce (SEO). The most seri ous defi ci enci es noted duri ng these <br />inspections were spotty riprap on th~ upstream face, erosion gullies and <br />seed1 i ngs on the downstream face, doubts regardi ng the densi ty of the rai sed <br />portion of the dam, and lack of a grade beam and downstream control at the <br />emergency spi 11 way. Morri son-Knudsen Engi neers, Inc. (MKE) was contracted by <br />the City of Greeley in July of 1987 to study the feasibility of rehabilitating <br />the dam. The study is partially financed by the Colorado Water Conservation <br />Boa rd (CWCB). <br /> <br />The following feasibility report contains chapters of general information <br />pertaining to the site, background information on the City of Greeley, <br />benefits to agri culture, and the avail abil ity and util i zati on of water from <br />the project. The plan of development contained in Chapter 5 includes a <br />discussion of the site inspection, geotechnical investigations, hydrological <br />analysis, alternatives for rehabilitating the dam, and the selected <br /> <br />1231 H <br /> <br />-1 ~ <br />