Legend:1 Vacant Land
NFHL Legend:Zone A
This map shows high-risk (1% annual chance or 100-year floodplain; Zones A, AE, AO, VE) and moderate-risk (0.2% annual chance or 500-year floodplain; Zone X) flood zones designated by the Federal Emergency Management Agency (FEMA).
Some parts of the flood zone may experience frequent flooding while other areas are only affected by severe storms. Areas outside of mapped zones may also be at risk since land use changes could have occurred after the maps were created, changing the flooding potential.
To designate the zones and determine insurance premiums, FEMA conducts flood insurance studies. Incorporated in the studies are statistical data for river flow and storm tides, hydrologic and hydraulic analyses, rainfall and topographic surveys, and storm frequency and intensity models.
This data is showing the Preliminary Flood Insurance Rate Maps (PFIRM). These maps have not been finalized, and are not available for all counties.
Zooming in to a smaller area will display the Base Flood Elevation (BFE) in feet for a particular zone.
Note: High-risk flood zones are also commonly referred to as Special Flood Hazard Areas.
Zone A High-risk areas subject to inundation by the 1-percent-annual-chance flood event generally determined using approximate methodologies. Because detailed hydraulic analyses have not been performed, no Base Flood Elevations (BFEs) or flood depths are shown.
Zone AE High-risk areas subject to inundation by the 1-percent-annual-chance flood event determined by detailed methods. Base Flood Elevations (BFEs) are shown.
Zone AO High-risk areas subject to inundation by 1-percent-annual-chance shallow flooding (usually sheet flow on sloping terrain) where average depths are between one and three feet.
Zone VE High-risk areas subject to inundation by the 1-percent-annual-chance flood event with additional hazards due to storm-induced velocity wave action. Base Flood Elevations (BFEs) are shown.
Zone X - 0.2 Pct Moderate-risk areas subject to inundation by the 0.2-percent-annual-chance flood event generally determined using approximate methodologies.
100 Year Flood Events Areas subject to inundation by a flood having a one-percent or greater probability of being equaled or exceeded during any given year.
500 Year Flood Events Areas subject to inundation by a flood having a 0.2 percent or greater probability of being equaled or exceeded during any given year.
Tidal Heights This map illustrates the extent of flood-prone coastal areas based on predicted water levels exceeding specific tidal heights as issued by local National Weather Service offices.
Frequency The coastal flood event frequencies and durations for tide gauges were calculated using observed tidal data over a three year period (2007-2009). The future frequency and duration predictions are based on the addition of half-meter and one-meter sea level rise scenarios to the observed water levels over the three-year period.
BFE Base Flood Elevation
SLOSH Category Selector
Sandy Surge ExtentExtent of Flooding
SLOSH0 - 3 feet above ground level
Data shown on this map were derived from storm surge inundation data created by the Sea, Lake, and Overland Surges from Hurricanes (SLOSH) model. SLOSH is used to calculate storm surge heights and the extents of inundation for hurricane evacuation studies. Hurricane storm surge heights are influenced by many factors, including hurricane intensity (categorized by the Saffir-Simpson hurricane wind scale, ranging from 1 to 5), size (radius of maximum winds), forward speed, the angle of approach to the shoreline, and more. Since many factors influence storm surge heights, the maximum calculated surge heights are composited for thousands of different types of hurricanes within a Saffir-Simpson category.
Superstorm Sandy Areas subject to inundation by the storm surge associated with Superstorm Sandy.
LegendLowest (SFHA + 0.3 ft)
The maps shown integrate FEMA's most recent special flood hazard area (SFHA) with four scenarios of sea level rise (referred to as lowest, intermediate-low, intermediate-high, and highest). These scenarios provide estimates of global sea level rise by the year 2050 based on the best available science synthesized by a panel of scientists from multiple federal agencies and academic institutions to provide to the U.S. National Climate Assessment. These four scenarios address different factors known to affect future sea level rise risk, including ocean warming and melting of mountain glaciers and ice sheets.
SFHA Special flood hazard areas. Areas subject to inundation by a flood.
BFE Base Flood Elevation
Legend:Estuarine and Marine Deepwater