FEMA is the official public source for flood maps for insurance purposes:
NOAA is responsible for producing flood forecast maps that combine precipitation data with USGS streamflow data:
- National Weather Service - Advanced Hydrologic Prediction Service
Long-Range River Flood Risk
- Coastal Inundation Dashboard: Real-time and historical coastal flooding information
USGS flood map products include:
- USGS Flood Information: Maps and resources for current and historical floods.
- Flood Inundation Mapper: Shows where river flooding might occur over a range of water levels. Only available for a few areas.
- Flood Event Viewer: Data collected during short-term flood events like hurricanes and multi-state storms. Includes rapid-deployment gages, temporary sensors, and high-water marks.
- Coastal Change Hazards Portal: Extreme storms, shoreline change, and sea-level rise.