In 2017, Sacramento County received grants from the California Department of Water Resources (DWR) Small Communities Flood Risk Reduction Program (SCFRRP) to complete feasibility studies to reduce flood risk to six Delta Legacy Communities in the north Delta, including: Hood, Courtland, Locke, West Walnut Grove, Ryde, and East Walnut Grove.
West Walnut Grove and Ryde are both located along the right bank of the Sacramento River near
the southwest boundary of Sacramento County. Levees which protect the tract of land known as
Grand Island where the Delta Legacy communities are located are maintained by Reclamation
District 3 (RD 3). In total, Grand Island is protected by nearly 29 miles of levees which provide
protection from flows in the Sacramento River on the east and Steamboat Slough to the west.