C150125 Feasibility Study - Laserfiche WebLink

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Feasibility Study Surface Creek Ditch and Reservoir Company Dam Rehabilitation Introduction The Surface Creek Ditch and Reservoir Company (SCD&RC) is applying for a $265,000 loan from the Colorado Water Conservation Board for permanent financing to rebuild the dam at the Hotel Twin Reservoir. The estimated total cost ofthe project is $363,500. Proiect Sponsor The SCD & RC is a Colorado mutual ditch company and non-profit corporation registered in the State of Colorado, in good standing. The Company was incorporated in 1886. There are 255 shareholders holding 810 shares of stock. The SCD & RC exists in perpetuity and sets annual assessments that are assigned to the stockholders according to the number of shares they own. It also holds the power to refuse to deliver water to shareholders who fail to pay their assessments, and the power to offer shares for sale to pay for unpaid assessments. The Board of Directors has the authority to incur debt as they deem necessary to carry out the purposes of the company. Proiect Service Area and Facilities SCD & RC operates a system of 18 reservoirs on Grand Mesa in Delta County providing agricultural irrigation water to 2384 acres. The service area encompasses an area of about 6000 acres in and around Cedaredge, and water is used primarily for agricultural purposes, with a small amount of municipal ownership (6%). SCD & RC pays assessments to Grand Mesa Water Users (GMWU) based on the amount of water run. Hotel Twin Dam is a Class 1 Dam with a capacity of 549 acre-ft and a 35 acre surface area. The dam height is 21.0 feet with a crest length of255 feet. In July 1995 the classification of the dam changed from Class 2 to Class 1 because of the potential for significant property damage and loss of life. The dam has a history of seepage problems dating back to the e<;rrly 1990's and several temporary repairs have been undertaken. In 1995 repairs were completed to re-line the outlet pipe and extend the service spillway pipe. In September 2000, with the installation of a temporary drain system, the State Engineer's Office (SEO) issued an order restricting the maximum level to 5' below the spillway crest. In May 2001, inspection by the SEO identified signs of structural weakness, principally due to excessive uncontrolled seepage. Following the end of the 2001 irrigation season, SCD & RC initiated geo-technical investigations on the dam, and in October 2001 portions ofthe downstream embankment were excavated to remove unsuitable material and investigate seepage areas. In January 2002, as a result of removal of the entire downstream shell of the embankment, the SEO issued a zero storage restriction until all repairs are completed. 4