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Personal Communications Garrison, B. U.S. Fish and Wildlife Service, Salt Lake City, Utah. June 1987. Jaminet, J. U.S. Forest Service, Routt National Forest, Yampa Ranger District, Yampa, Colorado. 1987. References Colorado Division of Wildlife. [Letter to Western Engineer, Inc., Grand Junction, Colorado]. 1977 March 8. Environmental Protection Agency. 1982 January 4. [Letter to District Engineer, Corps of Engineers, Sacramento, California]. U.S. Army Corps of Engineers. [Letter to Upper Yampa Water Conservancy District, Steamboat Village, Colorado]. 1982 February 17. U.S. Fish and Wildlife Service. [Letter to Corps of Engineers, Sacramento, California]. 1978 August 30. U.S. Forest Service. 1979. Environmental Assessment, Yamcolo Reservoir. Forest Service, Routt National Forest. U.S. Department of Agriculture, Allen Basin Reservoir Dir.ch Enlargement Green River Basin Location Diversion dams are located on South Hunt, Mill, and Bull Creeks, Routt National Forest, Rio Blanco and Routt Counties, Colorado. Function Dams divert water from South Hunt, Mill, and Bull Creeks into Allen Basin Reservoir on the Hunt River. Water is used as an irrigation supply. Completion Date The diversion dams and conveyance canal were completed in 1966, except for the conveyance ditch from South Hunt Creek, which was not completed until after 1968. Operators Allen Basin Reservoir Company Minimum Streamflow Agreement In 1964, a FS special use permit was issued to the Allen Basin Reservoir Company for the construction and maintenance of diversion dams and ditches to provide additional water for irrigation by diverting excess spring flows from South Hunt, Mill, and Bull Creeks. Condition 35 of the FS permit specifies minimum instantaneous flows below each of the three diversions. Streamflow Releases Minimum instantaneous flows of 0.5 cfs or the natural flow, whichever is less, are required below the diversion dams in Mill and Bull Creeks, and 1 cfs or the natural flow, whichever is less, is required below the diversion dam in South Hunt Creek. Objective To preserve the fishery in the above three streams. Information and Methods Used The minimum streamflows were determined from a joint field review of the proposed diversion sites and streams conducted by representatives from the FWS, FS, and Colorado Department of Game, Fish and Parks (now CDWR) in the fall of 1964. Reconmendations The FWS, in January of 1965, with concurrence from the Colorado Department of Game, Fish and Parks, recommended minimum streamflows below the three diversion dams identical to the requirements incorporated into the FS special use permit. Even though the permit 5