The Sacramento-San Joaquin Delta was once a vast tidal marshland and inland estuary. Now thousands of miles of fragile levees surround artificial islands below sea level. More than 90 percent of wetlands have disappeared, and native fish are dying.
Suisun Marsh is the largest brackish water marsh on the West Coast. It’s at the Delta’s western most edge. University of California Davis researchers set out on a boat in Montezuma Slough, which connects the Sacramento River to Suisun Bay.