The Delta Division provides for the transport of water through the central portion of the great Central Valley, including the Sacramento-San Joaquin Delta. The main features of the division are the Delta Cross Channel, Contra Costa Canal, Tracy (C.W. "Bill" Jones) Pumping Plant, Tracy Fish Collection Facility, and Delta-Mendota Canal, constructed and operated by the Bureau of Reclamation. This system provided full and supplemental water, as well as temporary water service, for a total of about 380,000 acres of farmland in 1992 The Sacramento-San Joaquin Delta's continual salinity intrusion from San Francisco Bay through Suisun Bay caused problems, especially for the towns of Antioch and Pittsburg, which depended on the nearby water for agriculture and industrial uses. Periods of high salinity made the water useless for these purposes. Unless water flowed past Antioch at a minimum rate of 3,300 cubic feet per second against the high tide, salt water entered Suisun Bay and the Delta, lowering the water quality. Between 1919 and 1924, salt water in Suisun Bay fostered the growth of teredo, a woodboring, salt water worm, whose increased population destroyed $25 million of the bay's wharves and pilings. In 1924, the water reached its lowest recorded stream flow, and the salt water content at Pittsburg reached 65 percent. Both Pittsburg and Antioch had used water from Suisun Bay for crops and industry, but in 1926, high salinity forced them to stop.
For more infomration on the Delta Division of the Central Valley Project, visit the project web site.