 Since then, the dam has not been raised nor any sediment dredged from the reservoir, and it has gradually declined to a third of its original capacity.As of February 2019, sedimentation has reduced the reservoir's capacity to , or only 19% of its designed capacity.Water is drawn from the reservoir via an intake structure near the south end of the dam into the Mission Tunnel, which transports water beneath the Santa Ynez Mountains to a small regulation basin, Lauro Reservoir.