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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 />SEITIIIFOUR <br /> <br />Background InformationT <br /> <br />4.1 STUDY AREA AND EXISTING FACILITIES DESCRIPTION <br /> <br />McElroy Dam is located in Grand County approximately 5 miles north and west of Kremmling, <br />Colorado. McElroy Dam is classified under SEO guidelines as a Small, Class III structure, with <br />a height of35 feet impounding 240 AF at the spillway crest. The left abutment of the reservoir is <br />the highway embankment fore CO Highway 134. The spillway is a 50-foot wide concrete crest <br />located on the right abutment of the dam. The spillway was not disturbed be the breaching of the <br />dam. The spillway is estimated to pass 3,338 cfs at the crest of the dam. Per the new dam safety <br />requirement a Small, Class III structure must be capable of passing a 100-year event. Based on <br />USGS regression equations documented in "Analysis of the Magnitude and Frequency of Floods <br />in Colorado", the 100-year event would be approximately 630 cfs. Therefore, the spillway is <br />capable of passing the design inflow. <br /> <br />The source of water for the reservoir is from precipitation, runoff, and groundwater seepage from <br />Pass Creek upstream of the reservoir. McElroy Dam is located in Section 16, Township 2 North, <br />Range 81 West ofthe 6th P.M, in Grand County. <br /> <br />4.2 WATER DEMANDS <br /> <br />The purpose of this project is strictly limited in scope to the rehabilitation of the outlet works. <br />No additional water storage will be developed in connection with this project. No new or <br />increased diversions will be made and no additional storage capacity will be created at the <br />reservoir. The uses of the water from McElroy Dam will not change as a result of this project. <br />This project will not increase the Hills irrigation water supply. <br /> <br />4.3 PROJECT LANDS <br /> <br />McElroy Reservoir storage will not change as a result of this project. This project will not <br />broaden the 800 acres the Hills currently irrigate. The present lands irrigated are 800 acres in a <br />portion of Sections 10 and 15, in Township 2 North of Range 81 West of the 6th P.M., County of <br />Grand, Colorado. A map ofthe irrigated acres from the CWCB database is shown in Figure 4.1. <br /> <br />URS <br /> <br />T:\PROJECTS\22238900_MCELROY _DAMlCWCB LOAN FEASIBILITY REPORT DRAFT.DOC\11-OCT -06\22238900IDEN 4-1 <br />