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| Sedimentation Changes in San Pablo Bay 1856 - 1983 |
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| United States Geological Survey |
| Jaffe, B. E., Smith, R. E., and Torresan, L. Z. |
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| 1887 - 1898 |
| Hydraulic mining debris continued to be deposited (at a slowed rate) in San Pablo Bay. A major factor in slowing deposition was the stoppage of hydraulic mining by Congress in 1884 that reduced the supply of sediment entering the Delta and San Francisco Bay. Even with stoppage of hydraulic mining, a volume of 34 million cubic meters (about 3 million cubic meters a year on average) was deposited in San Pablo Bay. Channels continued to fill, especially the Petaluma River channel in the northwest Bay. Much of the shallow area changed from depositional to either stable or erosional. Tidal mudflat area decreased by more than 5,000 acres (about 240 acres lost each year on average).
Click on one of the maps for a larger version of that map.
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 Return to the Bathymetry Change page. |
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U.S. Department of the Interior |
U.S. Geological Survey
