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Find a Commonwealth ResourceFairfax County
Floodplain delineations were first added to the County tax maps in the 1970's for creeks and streams with watersheds of 1 square mile or greater. In 1977 all the studies on these large streams had been completed and a…
Updated Oct 8, 2026
Virginia Department of Conservation and Recreation
Raster image service of FEMA floodplain depth grid found here: https://casdsis.dcr.virginia.gov/arcgis/rest/services/Floodplains The Federal Emergency Management Agency (FEMA) has broadened its delivery of flood hazard…
Updated Mar 24, 2026
