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Continuous Monitoring in the San Francisco Bay and Delta

The U.S. Geological Survey continuously monitors water level, salinity, water temperature, and SSC in San Francisco Bay to improve our knowledge of how the Bay works.

The purpose of this web page is to make time series data of salinity, temperature, water level, and SSC in San Francisco Bay available. Data are collected every 15 minutes at many sites in the Bay and usually at two elevations in the water column at each site. Salinity, water temperature, and water level time series began in 1989 and SSC time series begin in the 1990s. All data have been reviewed, edited, and approved for release.

Influence of Salinity, Bottom Topography, and Tides on Locations of Estuarine Turbidity Maxima in Northern San Francisco Bay

Time series of salinity and suspended-solids concentration measured at four locations and vertical profiles of salinity and suspended-solids concentration measured during 48 water-quality cruises from January 1993 to September 1997 are analyzed to describe the influence of salinity, bottom topography, and tides on locations of estuarine turbidity maxima in northern San Francisco Bay, California.

USGS Booth

FOR Rivers Festival
February 24-25, 2001

Our annual USGS booth at the 2001 Rivers Festival at Fort Mason in San Francisco was a big success! Take a tour of the booth, and learn how to find cool information on the USGS WWW like real-time stream flow and ordering USGS maps.

Science Support for Wetland Restoration in the Napa-Sonoma Salt Ponds, San Francisco Bay Estuary

  • The San Francisco Bay estuary has experienced tremendous human population growth during the past 150 years and a subsequent loss of natural habitats and degradation of water quality.
  • More than 91% of the tidal wetlands has been lost to reclamation for farmland, salt evaporation ponds, and residential or industrial propert.
  • Many native species dependent on tidal wetlands are now endangered or candidate species for listing.

The goal of this research project was to examine the ecological and hydrological function of the Napa-Sonoma salt ponds and their importance for waterbirds, including integrated studies on primary productivity, macroinvertebrates, plants, and fishes. This progress report presents the preliminary research results from the first year of the fieldwork.

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