USACE CWMS Data API

The Corps Water Management System Data API (CDA) is a RESTful API providing public access to USACE water management data. It supports retrieval of timeseries data (stream flow, reservoir levels, precipitation), location information, rating tables, location levels, reservoirs, and a full data catalog. The API supports pagination, unit conversion, and multiple date/time formats (ISO 8601 or epoch milliseconds). Data is publicly available without authentication for reading.