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FreeGovernmentUnited States
USGS Peak Flow Database
Annual peak streamflow data for flood frequency analysis
nwis.waterdata.usgs.gov
At a glance
- Region
- United States
- Coverage
- 30,000+ stream gages
- Access
- Free
- Category
- Government
- Last updated
- 2025
What's inside
- Peak Flows
- Flood Frequency
- Annual Maxima
- Return Periods
- Gage Records
Terms explained
What you can do with it
Typical work that data of this type supports.
- 01
Hazard maps
Map flood-prone areas and who and what is exposed.
Because it has: Flood Frequency
- 02
Model validation
Check flood models against observed events.
- 03
Design flows
Estimate 1-in-50 and 1-in-100 year floods for bridges, culverts and spillways.
Where AI adds value
Ideas for machine learning and AI agents built on this kind of data.
- 01
Flood extent from SAR
Segment flooded areas in radar imagery, even through cloud.
- 02
Depth estimates
Learn flood depth from terrain, rainfall and past events.
- 03
Flow forecasting
Train LSTM-style models on past records to forecast river levels and flow days ahead.
Related water data
- USGS StreamStatsUnited States | Free
- FEMA National Flood Hazard LayerUnited States | Free
- National Groundwater Monitoring NetworkUnited States | Free
- NHDPlus High ResolutionUnited States | Free
- NOAA Atlas 14 Precipitation FrequencyUnited States | Free
- US Drought Monitor (USDM)United States | Free
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