New Melones Lake is a reservoir on the Stanislaus River in the central Sierra Nevada foothills, within Calaveras County and Tuolumne County, California. The New Melones Dam and reservoir are a water collection and transfer unit of the United States Bureau of Reclamation's Central Valley Project. New Melones Lake provides irrigation water, hydroelectric po…New Melones Lake is a reservoir on the Stanislaus River in the central Sierra Nevada foothills, within Calaveras County and Tuolumne County, California. The New Melones Dam and reservoir are a water collection and transfer unit of the United States Bureau of Reclamation's Central Valley Project. New Melones Lake provides irrigation water, hydroelectric power, flood control, and wildlife habitat. Recreation uses include fishing, camping, and boating within the Glory Hole Recreation Area and Tuttletown Recreation Area.