USACE CWMS Data API (CDA) - Public Water Resources Data
Corps Water Management System public RESTful API providing time-series reservoir elevations, storage and flow for USACE dams and Section 7 projects nationwide.
cwms-data.usace.army.mil
At a glance
- Region
- United States (North America)
- Coverage
- United States
- Access
- Free
- Category
- Government
- Last updated
- 2026
What's inside
- reservoir storage
- water levels
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 storage
- 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
CDA/RADAR REST API (JSON)
Licence: Open data
Listed in our registry of open water APIs, which WaterDataGPT can query live.
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