USGS Water Services
FreeLiveLast verified 24 Sept 2026
Real-time and historical streamflow, gage height, and water-quality readings from US stations.
Example request
curl -s 'https://waterservices.usgs.gov/nwis/iv/?sites=01646500¶meterCd=00060&format=json'
Free tier, in plain English
Free with no API key and no documented rate limit.
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