Nearby Flood Gauges With Stage/flow Observations API
Nearby flood gauges with stage/flow observations. Perfect for: 'flood gauges near an address', 'USGS stream gauges nearby', 'river water levels near a property', 'NWS flood thresholds for an area'. Returns USGS stream/river gauges with latest stage/flow observations and NOAA/NWS threshold metadata within the search radius. National. Hydrologic context only - not a flood prediction or insurance determination. Charge-free when the gauge lookup fails.
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Daily probe success ratio, last 30 days. Last probed 2026-10-20.
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