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Bulletin 16()"98 Public Review Draft 003387 Chapter 7. Coastal Regions Lake Mendocino on the East Fork Russian River near Ukiah and Lake Sonoma on Dry Creek near Geyserville are the water storage facilities ofUSACE's Russian River Project. SCW A receives most ofthe water from this project. SCW A delivers about 29,000 af annually to Santa Rosa, Rohnert Park, Cotati, and Forestville in the North Coast Region, and another 25,000 af per year to Novato, Petaluma, the Valley of the Moon, and Sonoma in the San Francisco Bay Region. The Russian River project also regulates flow in the Russian River for agricultural, municipal, and instream uses within Mendocino and Sonoma counties, and municipal uses in Marin County. Water is imported from the Eel River into Lake Mendocino through the PG&E's Potter Valley Project. The 48,000 afRuth Lake is Humboldt Bay Municipal Water District's water storage facility on the Mad River. Downstream Ranney collector wells direct water that is released from Ruth Lake for distribution in the Eureka-Arcata-McKinleyville area. Humboldt Bay MWD is a water wholesaler with seven municipal, two industrial, and about 200 miscellaneous water customers. The district has been delivering water since 1962. There is another large water development project in the North Coast -. the Trinity River Division of the CVP -- but those facilities develop supply for the Central Valley and do not deliver water in the North Coast Region. The USBR constructed Trinity River facilities in the early 1960s to augment CVP water supplies in the Sacramento and San Joaquin valleys. The principal features of the Trinity Division are Trinity Dam and the 2,477,700 afClair Engle Lake on the upper Trinity River, Lewiston Dam, the 10.7-mile Clear Creek Tunnel beginning at Lewiston Dam and ending at Whiskey town Lake in the Sacramento River basin, Spring Creek Tunnel, and Spring Creek Power Plant. Exports from the Trinity River to the Sacramento River basin began in 1963. From 1980 through 1995, Trinity River exports averaged 825,000 af annually. In 1981, the Secretary of the Interior made a decision to increase instream flows in the Trinity River from 120,500 afto 286,700 af in dry years, and 340,000 af in wet years. In 1991, the Secretary of the Interior amended the 1981 decision, directing that at least 340,000 af be released into the Trinity River for water years 1992 to 1996, pending completion of a USFWS instream flow study. In 1992, CVPIA mandated that the secretarial decision remain in place until the instream flow study was 7-6 DRAFT I. r I l