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." .~." -,.',-.<." Executive Summary This study examines the feasibility of various structural and non-structural measures to rehabilitate the area comprising Ryan Gulch Dam and Reservoir for the Ryan Gulch Reservoir Company (Company). The study has been prepared in conformance with requirements for funding of the Colorado Water Conservation Board (CWCB) and the dam safety regulations of the Colorado State Engineer's Office (SEO). This study examines the feasibility of non-structural and structural alternatives; and demonstrates the technical, financial, environmental, and institutional feasibility of rehabilitating the existing dam. The structural alternatives include rehabilitating the aging outlet works and embankment, and enlarging the existing spillway to meet SEO guidelines. The recommended alternatives include the construction of a 95-foot-wide spillway armored with riprap (located on the left abutment), lining the upstream face of the dam with a clay liner, sleeving the existing 24-inch outlet pipe with an 18-inch steel pipe, and constructing a new upstream controlled inlet works. The Ryan Gulch Reservoir Company is requesting funding for the rehabilitation of the spillway alternative. The Company will be requesting additional funds in the next few years to rehabilitate the embankment and outlet works. Total capital expenses for the recommended spillway alternative, including construction and construction engineering with 20 percent contingency, design engineering, and the cost of this study, is $430,000. The Company will apply for 75 percent of the construction cost through a Construction Fund loan from the CWCB and could finance the remaining 25 percent of the construction cost through their water assessments and shareholders participation. Construction could begin in October 1999 with completion by January 2000. C.\WOR.K\PROJECTS\RY AN\FEASREPORT\RY ANRPT_DOC M3I'ChI7.1997 11