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Flow report

Live streamflow across the country.

Real-time discharge from 10,000+ USGS streamgauges, surging-streamflow ranking, paddle-runnable status, and a daily AI briefing — refreshed throughout the day from USGS and NOAA feeds. Built for paddlers, anglers, water managers, and flood researchers.

USGS gauges
10K+
Surging streamflows
12
Watersheds tracked
Updated
Aug 18
Open the streamflow layer on the interactive map Pan, zoom, and overlay every USGS gauge nationwide.
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Today's flow briefing

What the rivers are running at

An AI-generated summary stitched from today's USGS streamgauge readings, NWS flood watches, and watershed status across the country.

August
18
2026
Flow report
# Major Rivers Surge Across Eastern U.S. While West Faces Contrasts

**Exceptional flooding conditions are gripping the nation's midsection and eastern regions, with dozens of major rivers experiencing dramatically elevated flows—some running at over 100 times their normal levels. The Ohio River system leads the crisis with flows reaching 259,000 cubic feet per second at Old Shawneetown, while the Midwest's agricultural heartland faces severe inundation across Iowa, Illinois, and Indiana watersheds. Meanwhile, drought conditions persist in the Pacific Northwest and parts of the Southeast, creating a stark hydrological divide across the continent.**

The situation is most critical across the Ohio River basin and Upper Midwest, where recent rainfall has pushed numerous watersheds beyond 1,000% of normal flow. Ohio's Scioto River system is experiencing catastrophic conditions, running at 2,268% of normal, directly threatening Columbus and surrounding communities. The Wabash River in Indiana shows flows exceeding 246,000 cfs—more than 15 times normal—impacting Lafayette, Terre Haute, and dozens of smaller communities. Illinois faces particularly dire circumstances with the Sangamon River at an extraordinary 39,040% of normal flow, while the Embarras River runs at 13,576% of average. Major cities including Cincinnati, Indianapolis, and Peoria face significant flood impacts as the Great Miami, White, and Illinois River systems remain dangerously elevated. For water managers, these conditions demand careful coordination of reservoir releases and levee monitoring, while outdoor enthusiasts should avoid all river activities in affected areas—conditions remain life-threatening for recreation.

Contrasting sharply with the Midwest deluge, the Pacific Northwest shows below-average flows, with Washington's Samish River at just 67% of normal and the Green River near Seattle at 81% of normal. The Southeast presents a mixed picture: Florida's St. Johns River runs high at 152,000 cfs near Jacksonville under sunny skies, while Alabama's Black Warrior and Mississippi's Tombigbee rivers show surprisingly low flows at 150% and 58% of normal respectively, indicating persistent regional drought. The Snake River system across Idaho shows moderate elevated flows from mountain snowmelt, ranging from 5,200 to 19,200 cfs—conditions favorable for experienced rafters but requiring caution. Texas rivers including the Trinity and Sabine show modest elevations, while California's Sacramento River maintains controlled flows through reservoir management. Anglers should note that turbid, fast-moving water in flood zones has temporarily shut down fishing opportunities across the Midwest, though Western rivers may offer productive spring conditions.
Right now

Top river runs by streamflow

Whitewater and paddle runs sorted by current discharge. Useful as a first-look for paddlers planning a trip and an early-warning signal for downstream flood watchers.

River run Status Streamflow Class
Grand Canyon Runnable 9,320 cfs III TO IV
Greenwood To Mammoth Bar Runnable 1,390 cfs II TO II+
Tunnel Run (Ralston Powerhouse To Greenwood) Runnable 1,390 cfs IV- TO IV
Generation And Giant Gaps (Tadpole To Colfax-Iowa Hill Road) Runnable 1,390 cfs IV TO IV+
Yankee Jim Road To Ponderosa Way (Shirttail) Runnable 1,390 cfs II TO III
Chili Bar Runnable 1,390 cfs III TO IV
Coloma To Greenwood - (C To G) Runnable 1,390 cfs II TO III-
Sunrise Avenue To Watt Avenue Too High 1,020 cfs II- TO II
Royal Gorge (Soda Springs To Tadpole Creek) Runnable 817 cfs V TO V+
Christopher Creek Too High 443 cfs V
Indian Gardens Too Low 30 cfs IV- TO IV+
Hell's Gate Canyon Too Low 14 cfs V
Flow report FAQ

About the streamflow data

Where does this data come from?

Discharge readings come directly from the U.S. Geological Survey (USGS) streamgauge network — 10,000+ stations spread across every state. USGS publishes the data publicly; we aggregate, rank, and pair it with watershed boundaries and weather forecasts.

What is "cfs"?

Cubic feet per second — the standard unit for streamflow. One cfs is roughly 7.5 gallons per second flowing past the gauge. Small creeks run at single-digit cfs; the Mississippi runs at hundreds of thousands.

What does "percent of normal" mean?

The current flow at a gauge compared to its seasonal average for this date. 100% is right at the historical norm. 200%+ on a small-to-medium river is a strong indicator of flood conditions; below 70% indicates drought-stressed flow.

How fresh is the data?

USGS streamgauges report every 15 minutes; we re-pull every hour and re-rank. The AI briefing regenerates daily.

Can I get an alert when my home river fires?

Yes. Save any USGS gauge as a favorite in the Snoflo iOS app, set a threshold (e.g. "alert me at 200 cfs" or "alert me on stage above 12 ft"), and you'll get a push the moment it crosses. Free with a Snoflo account.

Is this a substitute for official flood warnings?

No. Snoflo is informational. For life-safety decisions follow guidance from your local NWS forecast office and emergency management. Use Snoflo data as one input among several.