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<br />Chapter III - Background Information <br /> <br />A. Study Area and Existing Facilities Description <br />Lake Arrowhead Dam is located in the western part of the Town of Evans on the southwest <br />corner of Weld County Road 54 and4ih Avenue, 2 miles southwest of Greeley as shown in Figure I- <br />I. Lake Arrowhead Dam is classified under SEO guidelines as a Small, Class III structure, with a <br />height of 30.2 feet impounding 230 AF at the spillway crest. Arrowhead Road crosses along the <br />1,480- foot dam crest long. The spillway is located on the right abutment and consists of a bridge <br />under the road. <br /> <br />On August 10, 2002 a large sinkhole was discovered on the downstream slope of the dam <br />along the axis of the 24-inch CMP outlet pipe. The sinkhole, approximately 15 feet in diameter and <br />20 feet deep, was caused by the failure of the 24-inch CMP outlet pipe. The SEO recommended the <br />lake to be drained until repairs could be made. The Company closed the road that crosses the dam <br />crest and drained the reservoir with pumps. <br /> <br />The source of water for the reservoir is from precipitation, runoff, and groundwater seepage. <br />The north end of the dam is located in the northeast quarter of the northeast quarter, Section 27, <br />Township 5 North, Range 66 West of the 6th P.M, at a point 26 feet from the East section line and <br />520 feet from the North section line of Section 27. <br /> <br />B. Water Demands <br /> <br />The purpose of this project is strictly limited in scope to the rehabilitation of the outlet pipe <br />and toe drain system. No additional water supplies will be developed in connection with this project. <br />No new or increased diversions will be made and no additional storage capacity will be created at the <br />reservoir. The uses of the water from Lake Arrowhead Reservoir will not change as a result of this <br />project. This project will not increase the Company's irrigation water supply. <br /> <br />C. Project Lands <br /> <br />Lake Arrowhead Reservoir storage will not change as a result of this project. This project <br />will not broaden the Company's service area and will not provide for irrigation of any new lands. <br />The present lands irrigated are 226.7 acres in Lake Arrowhead Subdivision described as a tract of <br /> <br />Lake Arrowhead Dam Rehabilitation Feasibility Study <br /> <br />4 <br /> <br />13DVLE <br />