Houston flood map
Not a survey. Not an insurance determination. FEMA draws the hazard colors. Neighborhood marks and bayou names are places, not flood boundaries. USGS numbers are provisional gage readings, not a warning.
Disclaimer and official links
This map overlays FEMA's published National Flood Hazard Layer (Flood Hazard Zones, MapServer layer 28). We do not draw floodplain polygons. A pin cannot bind a lender, a carrier, or the county. Houston floods outside the shaded 1% line. Detailed colors appear when you zoom in. That is FEMA's scale rule.
Address search uses Esri's public geocoder. Confirm the pin. Gage height uses each gage's own zero. Do not compare feet across sites. Reservoir elevation is NAVD88 and is not the same kind of number.
- FEMA NFHL Viewer
- FEMA Map Service Center
- FEMA NFHL GIS services
- Harris County Flood Warning System
- USGS Texas real-time water
- USACE Addicks and Barker
- Ready Harris
- Neighborhood pages
Last verified 2026-09-22. Not legal, medical, or insurance advice.