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<br />00 <br />N <br />'l:t' <br /> <br />CHAPTER IV <br /> <br />RELATIONSHIP OF WATERSHED CONDITIONS TO THE SILT PROJECT <br /> <br />Watershed conditions covered in this report are common to most irrigation <br />projects. They do not materially affect feasibility of the projecL <br />However, improvement of watershed conditions will extend the life of the <br />project and reduce operating difficulties and maintenance expenses, These <br />conditions are pointed out here so local, state and federal agencies which <br />deal with watershed lands can orient their programs to the solution of <br />these problems. <br /> <br />Location ~'1d Size <br /> <br />The watershed affecting the Silt project is northeast of the town of Rifle <br />in Garfield County, Colorado. The watershed is bounded on the west by the <br />Grand Hogback, on the north by the White River drainage divide, on the <br />east by the ridge between East Rifle Creek and Elk Creek, and em the south <br />by U. S. Highway 6-24 (see map), There are about 10 square miles OR <br />the Elk Creek draina~ east and north of Harvey Gap Reservoir included <br />because it contains project lands, <br /> <br />West Rifle, Middle Rifle and East Rifle Creeks are the main streams in <br />the watershed. The watershed is comprised of 112,000 acres, or 175 square <br />miles, and is divided into three subwatersheds as shown in table 22, <br /> <br />Table 22. - Subwatersheds, Silt project <br /> <br />Subwatershed <br />nU!llber <br /> <br />Drainages <br /> <br />Square miles <br /> <br />1 <br /> <br />Above Rifle Gap Reservoir <br /> <br />130 <br /> <br />2 <br /> <br />Area including project land and <br />facilities draining south from <br />Grand Hogback or through Harvey <br />Gap Reservoir <br /> <br />35 <br /> <br />3 <br /> <br />That area in Dry Elk Valley above <br />Harvey Gap Reservoir that drains <br />in to Elk Creek <br /> <br />10 <br />- <br /> <br />Total <br /> <br />175 <br /> <br />- 49 - <br />