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I I I I I I I I I I I I I I I I I I I Boulder and Left Hand Repair of Outlet Works CWCBFeasibilityStudy Novembers, 1999 Feasibility of the Repair of the Outlet Works and the Construction of a New Spillway at Twin lakes (a.k.a. Davis No.1 Dam) Proiect SDonsor The Boulder and left Hand Irrigation Company (the Ditch Company) is a Colorado Mutual Ditch Company and a Non-Profit Corporation. The Articles of Incorporation and Bylaws' are included in Appendix A. The Boulder and left Hand Irrigation Company acquired the Boulder and left Hand Ditch Company in March 1921, The Boulder and left Hand Ditch Company had been operating the ditch system since approximately 1873. The Ditch Company shares a common diversion dam, headgate, and augmentation facility with the Boulder and White Rock Ditch Company and North Boulder Farmers Ditch Company to divert water from Boulder Creek, The diversion dam, headgate, and augmentation structure are located on the north bank of Boulder Creek near 12th and Broadway in Boulder, Colorado, The three companies share a common ditch for approximately two-thirds of a mile before the Boulder and White Rock Ditch separates from the Boulder and Left Hand and North Boulder Farmers Ditch at approximately 21st and Canyon. The Boulder and Left Hand and North Boulder Farmers share a ditch for approximately 1,5 miles before they separate near the Foothills Parkway, The Boulder and Left Hand Ditch then generally flows in a northeasterly direction (approximately 14 miles) before emptying into Dry Creek near U,S, 287, The Ditch Company also owns and operates Twin lakes (a,k,a, Davis Reservoir Nos, 1 and 2) and Hayden Reservoir, Twin Lakes consists of two dams separated by the Boulder and White Rock Ditch, Davis No, 1, the eastern of the two lakes, has an earthfill dam composed of on-site materials, with imported, hand- placed riprap on the upstream slope, The outlet works for Davis No, 1 consists of an existing 62-foot long, 30-inch diameter corrugated metal pipe (CMP), an upstream low-pressure slide gate, and downstream concrete outlet ditch, Davis No, 1 Reservoir has a listed surface area and normal capacity of 16 acres and 137 acre-feet, respectively, Twin Lakes are used as an equalizer for direct flow deliveries within the ditch system and to supplement direct flow deliveries during the irrigation season, Hayden Reservoir is used as a supplemental water suppiy to irrigators, Proiect Service Area The service area of the Ditch Company includes approximately 2,000 acres of farm land in Boulder County as estimated in 1979, Irrigated crops consist of corn, alfalfa, grains, pinto beans, beets, and pasture grass, Revised in 1980, -1- ~