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. . . 002320 cllAPl'ER III PROJECT DEVELOPMENT (Hayden Mesa unit) Hayden Mesa Unit The Hayden Mesa unit is a potential irrigation development for lands situated along the south side of a 35-mile section of the Ysmpa River in northwestern Colorado. TIIenty Mile Park comprises the extreme eastern part of the area. The park includes the lower lands drained by Fish and Foidel Creeks which join Trout Creek} a. tributary of the Ysmpa. River. The remain- ing unit lands are wi thin the Hayden Bench area which includes lower lands drained by Grassy, Sage, and Dry Creeks, tributaries of the Yampa River, and bench lands along the south side of Yampa River Valley. The unit would provide water for 22,940 acres of land, including 22,640 acres of full service land and 300 acres of supplemental service land. It is also expected to provide some incidental benefits to fish and wildlife conservation, recreation, and sediment control. Uni t plan Water for the Hayden Mesa unit would be supplied primarily from excess flows of the East Fork of the Williams ForIe River, a tributary of the Ysmpa River, and from Fish Creek. Small amounts of additional water would be supplied from Gre.ssy, Sage, and Dry Creel:s during the early part of the irrigation season. Dunkley Reservoir would be constructed on Fish Creek to store flO'.ls of that creek and water of Ea.st Fork that woUld be brought to the reservoir via the East Fork Feeder Conal and the channel of Dunkley Creek which enters the reservoir basin. The reservoir water would be released as needed into the Hayden Bench Canal which liQuld extend north- wrd through Grassy Gap and then westward along the upper edge of the Hayden Bench area. Canal turnouts above Gra.ssy Gap liOuld serve lands in the routhern part of Twenty ~lile Park and turnouts below the gap liOuld supply lands in the Hayden Bench area. The Twenty Mile Park Canal would branch from the Hayden Bench Canal near Grassy Gap and extend northeast to serve lands in Twenty Mile Park. Laterals would be provided for distribution of water to the full ser- vice lands. Existing ditches for the supplemental service lands are believed adequate for unit development. l\rtificial drains would be required on approximately 2,000 acres of land lying in generally small scattered tracts in the Twenty Mile Park area. Design and construction. Dunkley Reservoir Dunkley Reservoir on Fish Creek would have a capacity of 56,900 acre- feet, including 52,000 acre-feet of active capacity, 3,900 acre-feet of dead storage, and 1,000 acre-feet for storage of sediment, The reservoir would have a normal water surface elevation of 7,104 feet and a dead 29