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to the Mendota Pool. The Delta-Mendota Canal carries water southeast from the Tracy Pumping Plant to the San Luis Unit and replaces San Joaquin River water stored by Friant Dam and used in the Friant-Kern and Madera systems. The Delta-Mendota Canal is about 117 miles long and terminates in the Mendota Pool. which is located about 30 miles west of Fresno. By bringing Sacramento River water to the lands which could no longer receive San Joaquin River water after the construction of Friant Dam, the canal is the facility that made the Central Valley Project possible. The West San Joaquin Division's primary feature is the San Luis Unit. It is a joint Central Valley Project and California State Water Project facility, authorized, built, and operated jointly by the federal government and the state of California. The storage capacity of San Luis is about 4 million acre-feet, of which 55 percent is federal storage and 45 percent is state storage. The San Luis Unit greatly increased flexibility in operating the southern portion of the CVP and increased the amount of water that can be served to irrigation districts in the San Joaquin Valley. The Friant Division consists of: (1) Friant Dam and Millerton Lake, (2) Madera Canal. and (3) Friant-Kern Canal. It has a capacity of 520,500 acre-feet and controls San Joaquin River flows. It provides downstream releases to meet requirements above the Mendota Pool, and provides conservation storage and diversion into Madera and Friant- Kern Canals. The Madera Canal carries water from Millerton Lake northward to lands in Madera County. The Madera Canal is 36 miles long and terminates at the Chowchilla River. The Friant-Kern Canal carries water southward from Millerton Lake to lands in Fresno, Tulare, and Kern counties. It is about 152 miles long and terminates at the Kern River about 4 miles west of Bakersfield. Census figures demonstrate the success of the CVP. Between 1940 and 1969, irrigated acreage in the seven Central Valley counties increased from 1,706,137 acres to 3,736,014 acres30 State Water Project The Feather River is the most important tributary of the Sacramento River. Its drainage area, located above Oroville, is approximately 3600 square miles. Runoff from the Feather River varies between 1.2 million acre-feet and 9 million acre-feet, ,vith a mean of about 4.5 million acre-feet. In 1931 the state engineer recommended the construction of a dam at Oroville that would impound approximately 30 Mercer and Morgan, page 24. The State Water Project stores Feather River water behind Oroville Dam and then releases that water to augment flows of the Sacramento River into the Delta. Chapter 1 A Brief History 21