 The Upper American River Hydroelectric Project (UARP) was constructed by SMUD between 1959 and 1985 and began revenue operation in 1961.The watersheds that supply the UARP, encompassing some 674 square miles, are characterized by the mountains in the east and incised canyons in the west.Most of the UARP lies on Eldorado National Forest and includes eight powerhouses and 11 reservoirs.