San Francisco Bay Region Geology and Geologic Hazards
Stories > Crystal Springs Reservoir, San Mateo County - Faulted Landscape
Crystal Springs Reservoir, San Mateo County - Faulted Landscape
Faults generate recognizable shapes in the landscape. One of these faulted landscape shapes (the technical term is "fault geomorphology", which literally means "fault Earth-shape") is a long, straight valley called a "linear valley". In San Mateo County, the waters of Crystal Springs Reservoir, west of I-280, fill the linear valley of the San Andreas Fault.
Other prominent linear valleys in the San Francisco Bay region include Tomales Bay in Marin County along the San Andreas Fault and Montclair Valley in Oakland along the Hayward Fault.
Learn more about the San Andreas Fault at: