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served, there is one use that predominates. For purposes of discussion, therefore, water suppliers and physical facilities have been classified by the predominant use they serve. For example, the Ridgway Reservoir at the Dallas Creek Project allocates approximately 25 percent of its stored water for agricultural purposes but is included in the M&I classification since that is the predominant allocation of its water. B.2.2 Regulatory Facilities B.2.2.1 Wayne N. Aspinall Storage Unit The Wayne N. Aspinall Storage Unit (Aspinall Unit) forms a portion of the Colorado River Storage Project (CRSP) and is owned and operated by the USBR. This unit is comprised of three storage reservoirs located on the main stem of the Gunnison River. These reservoirs are: Blue Mesa, Morrow Point and Crystal. The unit is located in Gunnison and Montrose Counties along the 40-mil e sect i on of the Gunni son Ri ver between the Ci ty of Gunni son and the Black Canyon of the Gunnison National Monument near the City of Montrose. Construction of the Aspinall Unit was authorized by Public Law 84-485 on April 11, 1956. All of the four CRSP units, including the Apina11 Unit, perform two major functions. Their primary function is to regulate streamflow so that water commitments to the Lower Colorado River Basin can be met in dry periods without curtailment of the development of water uses allotted to the Upper Basin. They also produce hydroelectric energy. Power revenues in excess of operating costs and reimbursable construction costs are available to assist in the repayment of CRSP participating projects; for example, the irrigation costs of projects that are beyond the payment abil ity of the irrigation water users. Transmission of the electric power to load centers is a cooperative effort of existing public and private utilities and the USBR. The combined power system of the storage B-3 [J 00003630 I I I I I I I I I I I I I I I I I I I