C150192 Approval letter - Laserfiche WebLink

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Upper Arkansas Water Conservancy District November 9, 2004(Revised November 24,2004) Page 2 of 4 Agenda Item 14c The 10-acre reservoir is on the.North Fork channel and has a dam crest width of 15 feet; a length of , approximately 500 feet and a reservoir surface area of 10 acres. The outlet pipe was inspected in 1999 by videotape and showed significant rusting of the pipe walls, which require repair. In addition, the outlet gate has started to fail and cannot be re-seated thereby causing leakage through the closed gate. The intake structure restricts access to approximately 100 acre-feet of reserVoir storage. 67 acre-feet of the dead storage will become active storage as part of the first phase of the Project. The enlargement phase will increase the Reservoir capacity from 500 acre-feet to 1095 acre-feet. The State Engineer's Office has indicated that the Dam will soon be changed from a Class 2 to a Class 1 dam, therefore needing an increase in spillway size and freeboard height. Feasibilitv Study Terry Scanga, Upper Arkansas Water Conservancy District's General Manager and Secretary, has completed the feasibility study in accordance with CWCB guidelines. The study includes engineering and cost es~imate prepared by Christopher Manera, PE, Colorado River Engineering. The Upper Arkansas Water Conservancy District The District is located in Salida, Colorado. The District serves to protect and develop water supplies in Chaffee, Western Fremont and Custer Counties. The District operates pursuant to Article 45, CRS. The District was formed in 1979 and operates five reservoirs in the Arkansas River System and owns shares of Twin Lakes Canal Company, Fryingpan-Arkansas Water "Project Water", and native Arkansas Basin water rights, In 1994 the District created the Upper Arkansas Water Activity Enterprise to provide a blanket augmentation plan for the water needs of the District. To date augmentation water is provided t01400 agricultural, industrial, and municipal users. Water Riahts In 1982,595 acre-feet of storage was decreed conditional. In 1987,495 acre-feet was made absolute, with 100 acre-feet identified as dead storage. In 1984, an additional 500 acre-feet of conditional storage rights were decreed establishing a total capacity of 1095 acre-feet and a maximum dam height of 55 feet. The Reservoir has historically been kept at capacity. The tributary area above the dam is 2000 acres with elevation ranging from 11,400 feet to 13,070 feet. In addition to the North Fork Reservoir, the District has several decrees for augmentation and storage rights, The Oistrict's augmentation plan . covers South Arkansas and Poncha Creek to the confluence with the Arkansas River, Cottonwood Creek, Chalk Creek, Cherry Creek, as well as the main stem of the Ark~nsas River, Proiect Description The Project will rehabilitate and enlarge the Reservoir. Without this rehabilitation, the Reservoir may soon be restricted by the State Engineer's Office due to a failing outlet pipe and gate. Four alternatives were analyzed in the feasibility study: 1 ) No action alternative 2) Inspect and repair gate. 3) Rehabilitate pipe and expansion of spillway 4) Rehabilitate and expand reservoir capacity