Data field · Event · Geographic area

Hydrologic observation value

A scalar hydrologic observation value for a stated parameter, statistic, unit, monitoring location, and observation time, including stream discharge and gage height.

Who carries it ↓

1Data sources

1Providers

1Free to access

Sources that carry it

1 source

U.S. Geological Survey

USGS Water Data APIs

Open OGC API product family for USGS continuous sensor measurements, daily values, time-series metadata, and monitoring-location metadata. Continuous and daily observations carry site and series identifiers, parameter/statistic codes, observation time, a precision-preserving string value, unit, approval status, qualifier, and last-modified time. Parameter code 00060 is discharge in cubic feet per second and 00065 is gage height in feet.

Free API National US 3 fields

Questions it helps answer

River stage and discharge during the event

Need Hydrologic observation value at scale?

We compare every source that carries it on your own records — fill rate, freshness, definition — and bring the winner into production for you.