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About the Bay
SF Bay/Delta Primer•SF Bay Then & Now•Glossary
San Francisco Bay |
San Francisco Bay |
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This map shows the historical distribution of tidal wetland, tidal mudflat, and shallow and deep open water circa 1770-1820. Tidal wetland represented about 37% of the total aquatic habitat in the historical bay ecosystem. Tidal mudflat represented about 10% of the total aquatic area and the remaining 53% was occupied by open bay water and tidal channels.
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This map shows the current (circa 1997) extent of tidal wetland, tidal mudflat, and shallow and deep ocean water. The former extent of these habitats that has been converted to others uses is shown in white. There has been an 82% reduction in tidal wetland acreage, a 42% reduction in tidal mudflat acreage, and a 7% percent reduction in open water area. All together, nearly 40% of the historical Bay's aquatic ecosystem has been lost. |
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For more information about these maps, please see our publication Sierra to the Sea (Appendix, Maps G12 and G13) |
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