USACE CWMS Data (RADAR) Public Services
US Army Corps of Engineers Corps Water Management System public data dissemination service providing reservoir, river stage, flow and water-control time-series data nationwide via a REST API.
cwms-data.usace.army.mil
At a glance
- Region
- United States (North America)
- Coverage
- National
- Access
- Free
- Category
- Government
- Last updated
- 2026
What's inside
- Reservoir levels
- Streamflow
- Stream stage
- Water control
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: Reservoir levels
- 02
Change over time
See how lakes and wetlands have grown or shrunk.
- 03
Design flows
Estimate 1-in-50 and 1-in-100 year floods for bridges, culverts and spillways.
Because it has: Streamflow
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
Flow forecasting
Train LSTM-style models on past records to forecast river levels and flow days ahead.
Machine access and documentation
Open API
CWMS Data RADAR RESTful API (JSON/XML time series)
Licence: Open data
Listed in our registry of open water APIs, which WaterDataGPT can query live.
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