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.
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.
A dramatic hydrological divide is reshaping America's waterways this week, with portions of Texas experiencing extraordinary flooding while northern watersheds face alarming deficits. The Ohio River at Old Shawneetown leads the nation with a massive 259,000 cubic feet per second (cfs) flow, while Texas Hill Country rivers are posting staggering percentage increases—the Frio River running at an astonishing 418,900% of normal and the Nueces River at 402,600% of normal. These extreme variations present both opportunities and hazards for water managers and outdoor enthusiasts, from white-water rafting conditions on swollen rivers to fishing challenges in drought-stressed watersheds.
The Texas Hill Country is experiencing an unprecedented hydrological event, with the Upper Frio and Upper Nueces watersheds transformed by recent rainfall. The Frio River's flow has exploded from a mere 8 cfs to over 34,000 cfs, creating conditions that likely range from dangerous to impassable for recreational users. Similarly, the San Antonio River system and Cibolo Creek (31,600% of normal) are running exceptionally high. This deluge extends beyond Texas—Arizona's Santa Cruz River near Tucson shows flows at 45,000% of normal, indicating widespread southwestern precipitation. Meanwhile, major navigation arteries like the Ohio River and Mississippi River system (including gauges at Hastings and St. Paul, Minnesota) are handling robust but manageable spring flows, supporting commercial traffic while offering excellent conditions for fishing near Jacksonville, Florida, where the St. Johns River flows at 152,000 cfs.
Conversely, troubling deficits plague portions of the upper Midwest and Pacific Northwest. The Wild Rice River in North Dakota registers at just 29% of normal flow, while Washington's Strait of Georgia watersheds (73% of normal) and Lake Washington basin (69% of normal) indicate persistent drought conditions that could impact salmon migrations and summer water supplies for Seattle. The Black Warrior River in Alabama has dropped to a concerning 37% of normal despite nearby systems running high. For anglers and rafters, the Arkansas River system through Oklahoma and Kansas offers moderate opportunities with flows between 4,000-10,700 cfs, while California's Sacramento River maintains steady releases near 16,000 cfs at Verona—ideal for steelhead fishing. Water managers should closely monitor the extreme Texas conditions for potential downstream flooding impacts along the Gulf Coast in coming weeks.
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 |
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.
Streamflow by state
Tap any state for USGS streamgauges, surging streamflows, and the daily AI flow briefing focused on that state.