NOAA National Water Prediction Service (NWPS) API
NOAA National Water Prediction Service (NWPS) API
The NWS National Water Prediction Service API returns river gauge metadata, observed and forecast stage and flow, flood categories and stages, and National Water Model reach streamflow forecasts as keyless JSON.
Required Attribution:
No attribution requirement stated. Do not imply NOAA/NWS endorsement; the NWS disclaimer page lists the conditions.
Coverage
US river gauges and stream reaches served by the National Water Prediction Service. A sample gauge request (Ohio River at Pittsburgh) returned observed and forecast stage and flow with flood categories. Complements usgs-water-data-apis, which covers USGS gauge observations.
Verdict
Keyless JSON API documented with Swagger. Licence: Custom (public-domain statement): the NWS disclaimer says "The information on National Weather Service (NWS) Web pages are in the public domain, unless specifically noted otherwise, and may be used without charge for any lawful purpose". Rate limits: Not stated. Signal Lab links only.
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