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Dallas Creek Project, Colorado (BR) -4- \ Downstream from the confluence of the Uncompahgre River and Dallas Creek, the valley is constricted for about six miles. Alkali and Cow Creek enter the river from the southeast in this area. The Ridgway Reservoir dam site is in this narrow portion of the valley. Farther north the river again cuts a wide valley and continues to widen to the north, being nearly 15 miles wide at Delta. River bottom vegetation consists of poplar and willow species, tamerisk and grasses. The lower elevation benches adjacent to the river are generally covered by sagebrush, bitterbrush, rabbitbrush and grasses. Dallas Creek is formed by the confluence of East and West Dallas Creeks which originate on the north slopes of the San Juan Mountains. It is joined from the west by Pleasant Valley Creek. Log Hill Mesa is located at the southeastern corner of the Uncompahgre Plateau and is bordered on the north by the Dallas Creek Valley. This mesa ranges up 1,000 feet in elevation above the adjacent Uncompahgre and Dallas Creek Valleys and slopes generally to the northeast. Drain- ageways from 10 to 300 feet deep divide the mesa into strips 2 to 3 miles long and one-quarter to one mile wide. The surface relief of these elongated strips of land is undulating to rolling. Intermittent streams of importance to the project on Log Hill Mesa are McKenzie and Horsefly Creeks. Vegetation on Log Hill Mesa is basically ponderosa pine, pinon pine, aspen, ju~iper and oakbrush. The Log Hill Mesa soils have a stable structure, moderate permeability, and a low saline-sodic content. Description of the Project Planning concepts upon which the Dallas Creek Project is based, are to develop uncommitted flows of MacKenzie Creek, Horsefly Creek, and the Uncompahgre River and its tributary Dallas Creek, to provide municipal and domestic, industrial, and irrigation water supplies for use in the Ridgway to Delta areas of Montrose, Delta, and Ouray Counties, Colorado. Project water will amount to 52,100 acre-feet annually. The project water supply will be apportioned on an annual basis as follows: Municipal and domestic water supplies, 27,500 acre-feet; light industry, 5,500 acre-feet; new irrigation, 6,430 acre-feet; and supplemental irrigation, 12,670 acre-feet. Municipal and domestic water will be made available, through the Tri-County Conservancy