AccessUSGS/BARD for DOQ and shoreline coverage
SFEI San Francisco Estuary Institute, for historical and present-day shoreline and wetland classification
NOAA Hydrographic surveys Datum definitions, etc.
DWR CA Department of Water Resources, for delta data
DFG California Department of Fish and Game GIS
CERES California Environmental Resources Evaluation System, for maps and spatial data for the Bay-Delta bioregion
California Geospatial Information Library CA GIS