Due to a lapse in appropriations, the majority of USGS websites may not be up to date and may not reflect current conditions. Websites displaying real-time data, such as Earthquake and Water and information needed for public health and safety will be updated with limited support. Additionally, USGS will not be able to respond to inquiries until appropriations are enacted. For more information, please see www.doi.gov/shutdown
San Francisco Bay and Sacramento-San Joaquin Delta Estuary
The San Francisco Bay/Sacramento-San Joaquin Delta is one of the largest estuaries in the United States. It provides water to more than 25 million California residents, farmlands, and key fish and wildlife habitats. To help ensure the health of this crucial estuary, the U.S. Geological Survey provides science essential to address issues of importance to our partners and the public.
San Francisco Bay and Delta Overview Video
Learn about the San Francisco Bay-Delta ecosystem, current management issues, and some of the monitoring and research the USGS is conducting in coordination with others.Watch Video
USGS Science at Work
This fact sheet provides an overview of USGS research in the San Francisco Bay-Delta region.Read More
Stories From the Field
USGS scientists track waterfowl in Suisun Marsh. Follow the team as they go into the marsh to collect data. Be sure to view the gallery of photos on the multimedia tab after you read the story.Read the Story
Survival, travel time, and utilization of Yolo Bypass, California, by outmigrating acoustic-tagged late-fall Chinook salmon
Juvenile Chinook salmon (Oncorhynchus tshawytscha) migrating through California's Sacramento-San Joaquin River Delta toward the Pacific Ocean face numerous challenges to their survival. The Yolo Bypass is a broad floodplain of the Sacramento River that floods in about 70 percent of years in response to large, uncontrolled runoff events. As one of...Pope, Adam C.; Perry, Russell W.; Hance, Dalton J.; Hansel, Hal C.
Mercury on a landscape scale—Balancing regional export with wildlife health
The Cosumnes River watershed requires a 57–64 percent reduction in loads to meet the new Delta methylmercury (MeHg) total maximum daily load allocation, established by the Central Valley Regional Water Quality Control Board. Because there are no large point sources of MeHg in the watershed, the focus of MeHg load reductions will fall upon non-...Marvin-DiPasquale, Mark C.; Windham-Myers, Lisamarie; Fleck, Jacob A.; Ackerman, Joshua T.; Eagles-Smith, Collin A.; McQuillen, Harry
Bathymetry and digital elevation models of Coyote Creek and Alviso Slough, South San Francisco Bay, California
In 2010 the U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center completed three cruises to map the bathymetry of the main channel and shallow intertidal mudflats in the southernmost part of south San Francisco Bay. The three surveys were merged to generate comprehensive maps of Coyote Creek (from Calaveras Point east to the...Foxgrover, Amy C.; Finlayson, David P.; Jaffe, Bruce E.; Fregoso, Theresa A.