BRENTWOOD, CALIF. - NOV. 8 : View of the spillway at the Los Vaqueros Reservoir in Brentwood, Calif., on Monday, Nov. 8, 2021. The Contra Costa Water District is working with other Bay Area water agencies to expand the region's water supply, is moving forward with a $1 billion plan to significantly expand the reservoir by raising the height of its dam. Currently the dam is at 231 feet and plan to raise it to 287 feet. (Jose Carlos Fajardo/Bay Area News Group)