Biology Reference
In-Depth Information
Yolo Bypass
and
North Delta
Napa-
Sonoma
Marsh
Suisun
Marsh
Petaluma
Marsh
Franks
Tract
100 ppb wet wt.
San Joaquin
Watershed
N
RMP
Fish Mercury Project
0
10
20
miles
Map 14. Levels of methyl mercury (parts per billion, wet weight) in small fish
throughout the bay and delta in 2007. Heartening are the lower levels found in the
Napa-Sonoma Marshes, a major restoration site. (Regional Monitoring Program,
S.F. Estuary Institute & UC Davis Fish Mercury Project)
Another area that collects a lot of sediment from local creeks is the
South Bay below the Dumbarton Bridge. This bodes well for the area's am-
bitious salt pond restoration project. Project planners asked Schoellhamer
to budget sediment requirements for a variety of restoration designs. After
examining the elevations of 65 different ponds, he found that some were
much lower than others. In a design converting all of the ponds to tidal
marsh, he projected that the vast majority of sediment would be needed to
