NHD / 3DHP via The National Map Hydrography Services
USGS National Hydrography Dataset live ArcGIS REST services exposing waterbody (lake, pond, reservoir) and flowline features for the United States, queryable and downloadable through The National Map.
hydro.nationalmap.gov
At a glance
- Region
- United States (North America)
- Coverage
- United States
- Access
- Free
- Category
- Government
- Last updated
- 2025
What's inside
- waterbody features
- lakes
- reservoirs
Terms explained
What you can do with it
Typical work that data of this type supports.
- 01
Storage tracking
Follow storage and releases through the season.
Because it has: lakes
- 02
Change over time
See how lakes and wetlands have grown or shrunk.
- 03
Operations
Support release and supply decisions.
Where AI adds value
Ideas for machine learning and AI agents built on this kind of data.
- 01
Storage from space
Estimate volume from satellite water area and altimetry.
- 02
Release decisions
Optimise releases against inflow forecasts.
- 03
Shrinkage alerts
Detect water bodies that are drying or being encroached.
Machine access and documentation
Open API
ArcGIS REST MapServer/FeatureServer endpoints
Licence: Open data
Listed in our registry of open water APIs, which WaterDataGPT can query live.
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