Skip to main content
U.S. flag

An official website of the United States government

South San Francisco Bay, California

January 1, 2007

The U.S. Geological Survey, in cooperation with the California Coastal Conservancy and the National Oceanic and Atmospheric Administration, mapped the floor of south San Francisco Bay and adjoining land using single-beam sonar and airborne lidar (light detection and ranging). To learn more, visit


View eastward. Elevations in mapped area color coded: purple (approx 15 m below sea level) to red-orange (approx 90 m above sea level). South San Francisco Bay is very shallow, with a mean water depth of 2.7 m (8.9 ft). Trapezoidal depression near San Mateo Bridge is where sediment has been extracted for use in cement production and as bay fill. Land from USGS digital orthophotographs (DOQs) overlaid on USGS digital elevation models (DEMs). Distance across bottom of image approx 11 km (7 mi); vertical exaggeration 1.5X.

Publication Year 2007
Title South San Francisco Bay, California
DOI 10.3133/gip57
Authors Peter Dartnell, Helen Gibbons
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title General Information Product
Series Number 57
Index ID gip57
Record Source USGS Publications Warehouse
USGS Organization Coastal and Marine Geology Program; San Francisco Bay-Delta