Water Stress & Drought
What Is Streamflow?
Streamflow is the volume of water moving through a river or stream, commonly reported as discharge and percentile versus history.
Check the live HazardNow dashboard
Use this page to understand Streamflow. Use the live dashboard to see current alerts, infrastructure stress, weather, wildfire, travel, public-health, supply-chain, and stability indicators in one place.
Quick answer / What to check next
Quick answer
Streamflow is the amount of water moving through a river or stream at a measurement point, commonly reported by stream gauges.
What this signal means
Streamflow can indicate flood context, drought stress, water availability, habitat conditions, and infrastructure concerns.
What to check on HazardNow
Gauge location, flow percentile, recent trend, rainfall, snowmelt, drought category, and local water-agency messages.
Verify with official source
USGS Water Data
Quick read
- Useful for
- Reading flood, low-water, drought, and water-supply context.
- Watch
- gauge location, discharge, stage, percentile, trend, and upstream rain or snowmelt.
- Confirm with
- USGS Water Data, NWS river forecasts, and local water agencies.
- Remember
- One gauge describes one point; conditions can differ upstream or downstream.
What streamflow measures
Discharge is usually expressed as cubic feet per second, while stage is water height at the gauge. Percentiles compare current flow with historical values for that day or period.
A low percentile can signal drought or withdrawals; a high percentile can indicate runoff or flood potential. Always check the specific gauge and basin context.
Visual reference
Streamflow percentile
Current flow is compared with historical distribution at the same gauge.
Official sources to verify
Use these links to verify current source text, update timing, and agency caveats.
Last reviewed: . This page explains general preparedness information and does not replace official instructions.
FAQ
Is streamflow a live value on this page?
No. This Learn page is evergreen education. Open the HazardNow dashboard and primary source links for current public context.
What should I do if this signal looks concerning?
Use it as a prompt to verify official sources, providers, operators, or local authorities. HazardNow is informational only.
Related terms
Check the live HazardNow dashboard
Use this page to understand Streamflow. Use the live dashboard to see current alerts, infrastructure stress, weather, wildfire, travel, public-health, supply-chain, and stability indicators in one place. Focus on us-drought-monitor, drought-levels in the live view.