Note this page heavily depends on information from the REGIS program at U.C. Berkeley where they may have, perhaps, the only Internet accessible GIS system. They suggest that the system is underpowered and relatively slow so let's hope they get some funding to keep this great resource growing.
Based on the National Wetlands Inventory (F&WS, USDI) these images show farmed wetlands (orange), tidal wetlands (light green), and salt evaporators (red).
Historic open water (blue), historic marsh (light green), and present shoreline (black). In the north bay a comparison of this map to the Wetlands map allows you to see the wetland losses to salt evaporators (red) and farmed wetlands (tan).
These images isolate (non-farm related?) land uses in what were once historic open water or marshlands. The maps show the historic impacts of salt evaporators and land fill for urban development, airports and transportation related activities (i.e., Golden Gate Ferry Terminal in the Ross Valley
Few areas (metropolitan or rural) have accurate, up-to-date information. This graphic for the majority of the Bay Area is based on proprietary information of the Association of Bay Area Governments information('88-'89, update to 1992 is available from ABAG) and is highly simplified. For the three Delta counties, the source was USGS, and data(1985) are available. Simplified land use types here are: Residential (yellow), Commercial/Industrial (red), Intensive Agriculture (light green), and Rural (dark green).
1990 Planning Map, UC Berkeley REGIS
Compare this general planning map from 1990 to the existing land use map. It clearly shows built-up areas (grey), planned residential(yellow), planned industrial (light blue), and planned commercial(purple); and shows the major urbanization planned at that time around the Delta cities of Sacramento, Stockton, and Tracy.
Based on the National Wetlands Inventory (F&WS, USDI) these images show farmed wetlands (orange), tidal wetlands (light green), and salt evaporators (red). [I believe the dark green areas on the Petaluma River and in Suisun Marsh (Map #2) are "managed" marshes of duck clubs. j.l]. These images show the importance of the North Bay and Suisun marsh to the bay system. The grid on map 1 represents lines of 7.5 min. latitude/longitude corresponding to USGS topographic quadrangles.
Source: Preliminary map of historic margins of marshland, San Francisco Bay, California / by Donald R. Nichols and Nancy A. Wright. [Menlo Park]: United States Geological Survey, 1971. Scale 1:125,000. Series title: Basic data contribution; 9.
Historic open water (blue), historic marsh (light green), and present shoreline (black). In the north bay a comparison of this map to the Wetlands map allows you to see the wetland losses to salt evaporators (red) and farmed wetlands (tan).
This image isolates non-farm related? land uses in what were once historic open water or marshlands. The maps show the historic impacts of salt evaporators and land fill for urban development, airports and transportation related activities (i.e., Golden Gate Ferry Terminal in the Ross Valley)
Streams
Watersheds
Groundwater Basins
Delta Islands and Tracts
Delta Agricultural Land Use Change: 1976-1993 (DWR)
