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Important for you to know:

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  • Scheduled Maintenance Notice
    USGS will be performing maintenance on the time series data processing system beginning at 09:00 EDT on September 10, 2026. During this period, delivery of the latest time series data will be delayed. The maintenance is expected to finish within 2 hours, after which all backlogged time series data will be processed and delivered to WDFN web portals and APIs.

Water Data for the Nation

High-quality and discoverable water data for everyone
Over 135 years of water data from more than one million monitoring locations

Monitoring locations

A water monitoring location is a geographic location where data measurements are recorded. Monitoring locations are central to the organization of data within Water Data for the Nation. All data recorded at a monitoring location are accessible through its associated Monitoring Location Page.