After the 1971 San Fernando earthquake, the California Department of Water Resources Division of Safety of Dams directed a stability investigation of all hydraulic-fill dams in California, including the Chatsworth Reservoir dams. The analysis determined that the Chatsworth dams would have to be completely rebuilt in order to be safe during a major earthquake. In 1972 the reservoir was drained and taken out of service. No schedule for reconstructing the Chatsworth Reservoir has been established.