Interagency Ecological Program Spring Season report
- Organisms in this ecosystem are adapted to high turbidity conditions, and reductions in turbidity can have many negative ecological effects.
- Higher values for Secchi depth indicate lower turbidity.
- Secchi depth is measured monthly by DWR’s Environmental Monitoring Program by dropping a black-and-white disk in the water until it disappears.
Secchi Depth by Region
In 2018, San Pablo bay was close to the long-term average.
In 2018, Suisun Bay was also close to the long-term average
In 2018, the Delta was much clearer than average, the clearest Spring on record.
For more information see: Schoellhamer, D. H. 2011. Sudden clearing of estuarine waters upon crossing the threshold from transport to supply regulation of sediment transport as an erodible sediment pool is depleted: San Francisco Bay, 1999. Estuaries and Coasts 34(5):885-899.