Department of Water Resources Home

Flood Management

Best Available Maps

The California Department of Water Resources (DWR) has updated the Best Available Maps to display the latest floodplains in a web viewer located at With this viewer, DWR has expanded the floodplains to cover all counties in the State and to include 500-year floodplains. The 100-, 200-, and 500-year floodplains can be selected for display using this viewer. The web viewer allows users to view a particular area, identify their potential flood hazards, and print a floodplain map.