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Feasibility Study Horsecreek & Prospect Reservoirs PROJECT SPONSOR The Henrylyn Irrigation District ("District") was established by an Order of the Weld County Commissioners, dated October 7,1907, attached, and operates pursuant to the Irrigation District Law of 1905, as amended, C.R.S. §§ 37-42-101 et. seq. PROJECT LOCATION AND DESCRIPTION Horsecreek Reservoir is located in Sections 31 and 32, Township 1 North, Range 64 West of the 6th Principle Meridian, in Weld County, Colorado. The dam is located approximately 6 miles southeast of Hudson, Colorado. Horse Creek Dam has a maximum vertical height of approximately 70 feet and a crest length of about 4,800 feet. The upstream slope of the dam has a 2.7 H to 1 V slope with riprap placed along the slope for erosion protection. The crest of the dam is approximately 16 ft wide. The downstream slope is at a 2H to1V from the dam crest to the 35 ft bench (berm) at elevation 5,045 between stations 30+00 and 41+00. The downstream slope ofthe berm extends from elevation 5045to the natural ground surface at a slope of 3.4H: 1 V. This reservoir has failed in the past and has undergone several rehabilitations to various components over the years. Prospect Reservoir is located in Sections 25 and 26, Township 1 North, Range 64 West of the 6th Principle Meridian, in Weld County, Colorado. The dam is located approximately 8 miles southeast of Hudson, Colorado. Prospect Reservoir Dam has a maximum vertical height of approximately 45 feet and a crest length of about 5300 feet. The upstream slope of the dam is at 2H tol V slope with concrete facing placed along the slope for erosion protection. The downstream face is approximately 2H to 1 V. The crest of the dam is approximately 18 feet in width. The dam embankment failed in 1980 and the reservoir dam embankment, the spillway, and outlet works have all undergone several rehabilitations over the years to address problems that have developed. PROJECT SERVICE AREA The service area of for the HID includes approximately 32,750 acres of irrigated farm land in Weld County, Colorado. The approximate service area boundaries are shown on the map in Appendix A which was provided by HID. The service area starts approximately two miles west of Hudson and extends generally east and south along I-76, to approximately nine miles east of Keenesburg and south to the two reservoirs. The area irrigated below the two reservoirs is fed through the Denver- Hudson Canal (see Figure A-1) which start at Barr lake and ends at Prospect Reservoir. From Horse Creek Reservoir the Denver-Hudson Canal supplies irrigation water to seven laterals and Lord Reservoir delivering irrigation water to the 20,460 acres which are located within the District's Division II. The Denver-Hudson Canal also supplies the District's Prospect Reservoir. Horsecreek & Prospect Reservoirs - 06.014 Henrylyn Irrigation District Page 1