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FloodSight is informational only. It is not a substitute for official emergency guidance. Do not rely on it as the sole basis for evacuation or other safety decisions.
Data is sourced from FEMA, NOAA/NWS, and USGS. It may contain errors, delays, or gaps. Always follow guidance from local emergency management.
By continuing, you acknowledge that FloodSight and its developers are not liable for decisions made using this tool.
🌊 FEMA Flood Zones: Official maps showing federal flood risk areas. Use these to understand your long-term risk and insurance requirements.
🧵 USGS Stream Network: A detailed map of rivers, creeks, and waterways from the NHD (National Hydrography Dataset). Color-coded by stream type — darker blue lines indicate perennial waterways.
📡 NEXRAD Radar: High-resolution live precipitation data from NOAA/NWS. Essential for tracking active storms and seeing where heavy rain is currently falling.
📠USGS River Gauges: Real-time sensors measuring water depth. These provide immediate warnings when local rivers reach critical flood stages.
🦆 Wetlands: Transition zones where water covers the soil. These areas provide natural flood storage and are sourced from the USFWS (U.S. Fish & Wildlife Service).
🔗 View Open Source Licenses & Data Credits →
• SFHA (Special Flood Hazard Area): The land area covered by the floodwaters of the base flood. In these areas, the NFIP's floodplain management regulations must be enforced and the purchase of flood insurance is mandatory.
• BFE (Base Flood Elevation): The elevation to which floodwater is anticipated to rise during the base flood (100-year flood).
• Elevation Level (Ground): The estimated height of the ground surface at a specific point relative to sea level, sourced from the USGS 3D Elevation Program.
• Storm Surge Level: The rise in seawater level caused solely by a storm, over and above the normal predicted tide.
Blue: Perennial streams & rivers — flow year-round.
Dashed Blue: Intermittent streams — flow seasonally.
Cyan: Canals & ditches — human-made water channels.
Magenta: Pipelines — water moving through pipes or conduits.
Yellow: Aqueducts — large scale artificial water transport.
Red: Coastline — the boundary line between land and sea.
Filled Blue Area: Lakes, reservoirs, and ponds.
• Zone A: High Risk. 1% annual chance of flooding. No Base Flood Elevations (BFEs) determined.
• Zone AE: High Risk. 1% annual chance of flooding. BFEs have been determined.
• Zone AH: High Risk. 1% annual chance of shallow flooding (usually ponding), with depths between 1 and 3 feet. BFEs determined.
• Zone AO: High Risk. 1% annual chance of shallow flooding (usually sheet flow on sloping terrain), with depths between 1 and 3 feet.
• Zone AR: High Risk. Temporarily increased risk due to the building or restoration of a flood control system (levee/dam).
• Zone A99: High Risk. Areas to be protected by a federal flood control system where construction has reached statutory milestones.
• Zone V / VE: Coastal High Hazard. High risk areas subject to storm-induced velocity wave action. (VE has BFEs determined).
• Zone X (Shaded): Moderate Risk. 0.2% annual chance of flooding (500-year flood).
• Zone X (Unshaded): Minimal Risk. Areas outside the 0.2% annual chance floodplain.
• Zone D: Undetermined Risk. Areas where flood hazards are undetermined, but flooding is possible.
• Regulatory Floodway: The channel of a river that must be kept clear to discharge the base flood without increasing water levels.
• Reduced Risk Due to Levee: Areas protected by levees from the 1% annual chance flood. Levees do not eliminate all risk.
🟢 Normal: Water levels are within the typical, expected range.
🟡 Action: The river is nearing its banks. Start preparing and monitor closely.
🟠Minor: Nuisance flooding begins. Low roads, yards, and parks may be covered.
🔴 Moderate: Significant flooding. Some buildings may be impacted and local roads closed.
🟣 Major: Severe, life-threatening flooding. Extensive damage and evacuations are likely.
FEMA: Federal Emergency Management Agency (Flood Zones)
USGS: United States Geological Survey (Streams, Elevation, Gauges)
NOAA/NWS: National Weather Service (Precipitation Radar & Alerts)
USFWS: U.S. Fish & Wildlife Service (Wetlands Data)
ArcGIS: Map infrastructure & geocoding services.