Skip to main content
U.S. flag

An official website of the United States government

Bathymetric surveys collected near Dumbarton Bridge in south San Francisco Bay, California, 2008 to 2019

June 30, 2022

In 2008, the U.S. Geological Survey began mapping the main channel and shallow intertidal mudflats between the Dumbarton Bridge and a railroad bridge located 1 km to the south in south San Francisco Bay. This information was collected to document bathymetric change before and after restoration to inform the South Bay Salt Pond Restoration Project (, which initiated the restoration of a former salt pond (SF2) on the western shore in 2010. In 2011, following the collection of eight bathymetric surveys, funding for this site-specific project came to an end, yet the location remained an instrumentation calibration site for ongoing research in Alviso Slough (Foxgrover and others, 2011). The calibration surveys collected near the Dumbarton Bridge resulted in an additional eight surveys, collected primarily in the main channel, from 2013 to 2019.

All 16 surveys were collected using U.S. Geological Survey's research vessel R/V Parke Snavely equipped with an interferometric sidescan sonar system, following the procedures detailed in Foxgrover and others, 2011. The bathymetry is provided here as 1-m resolution rasters in geoTIFF format, referenced to the vertical datum of mean lower low water (MLLW). To convert to the North American Vertical Datum of 1988 (NAVD88), subtract a static offset of 0.37 m (datum conversions provided in Foxgrover and others, 2007).

References cited:

Foxgrover, A.C., Finlayson, D.P., Jaffe, B.E., and Fregoso, T.A., 2011, Bathymetry and digital elevation models of Coyote Creek and Alviso Slough, South San Francisco Bay, California (ver. 5.0, June 2020): U.S. Geological Survey Open-File Report 2011-1315, 21 p.,

Foxgrover, A.C., Jaffe, B.E., Hovis, G.T., Martin, C.A., Hubbard, J.R., Samant, M.R., and Sullivan, S.M., 2007, 2005 Hydrographic survey of south San Francisco Bay, California: U.S. Geological Survey Open-File Report 2007-1169, 113 p.,

Publication Year 2022
Title Bathymetric surveys collected near Dumbarton Bridge in south San Francisco Bay, California, 2008 to 2019
DOI 10.5066/P9BIB67S
Authors Amy Foxgrover, Bruce E Jaffe, Theresa Fregoso
Product Type Data Release
Record Source USGS Digital Object Identifier Catalog
USGS Organization Pacific Coastal and Marine Science Center