Approximately 95% of the water the District distributes originates from the South Fork Stanislaus River and is impounded in PG&E’s Lyons and Pinecrest Reservoirs. PG&E currently owns and operates a canal and flume system to convey water from Lyons Reservoir to the Phoenix Powerhouse. The District owns and operates a total of 71 miles of ditch, flume, pipe, and tunnel infrastructure that diverts water from the PG&E system at various locations. The District’s raw water conveyance system serves a variety of customer types and uses, including agricultural/irrigation water, ditch domestic use, commercial and industrial, wholesale, private and public water agencies, and raw water supply to other treated water agencies such as the Twain Harte Community Services District. The system also supplies water to 14 of the District’s own surface water treatment facilities. Raw water storage is augmented and regulated in Phoenix Lake and an assortment of smaller impoundments.
TUD currently has an existing 1983 contract with PG&E to provide the water supply for TUD from the South Fork Stanislaus River. This water is stored in Pinecrest Lake, Lyons Reservoir, Phoenix Lake and other small reservoirs on the TUD ditch system. PG&E currently owns Lyons Reservoir and the 15.7-mile Main Tuolumne Canal that leads to its Phoenix powerhouse. From the Main Canal, TUD’s water splits into three branches – one serves Twain Harte, Soulsbyville and Tuolumne; and another feeds TUD’s network of ditches, pipelines and treatment plants that serve Crystal Falls, Big Hill and Columbia. The remainder goes into Phoenix Reservoir to serve Phoenix Lake, East Sonora, Sonora and Jamestown.