Real-time river flooding
across America.
Live USGS streamgauge readings, FEMA flood zones, NWS flood watches and warnings, and historical context — one map, refreshed throughout the day. Built for flood researchers, emergency managers, and outdoor recreationists.
What's happening right now
An AI-generated daily summary stitched from active streamgauge readings, NWS warnings, and watershed status.
**URGENT NATIONWIDE FLOODING ALERT** — A dangerous flooding crisis is unfolding across multiple regions of the United States, with catastrophic conditions reported from Texas to Pennsylvania, while Hurricane Lowell simultaneously batters Hawaii with life-threatening flash floods and winds. The most extreme situation is developing in Southeast Texas, where the Pine Island Bayou near Beaumont has exploded to an astounding 15,000% of normal flow, forcing immediate evacuations. Residents in affected areas are urged to seek higher ground immediately as emergency services struggle to respond to rapidly deteriorating conditions across more than a dozen watersheds experiencing extreme flooding.
Southeast Texas faces the most dire emergency, with the Richland area near Houston recording flows at 18,052% of normal and the Lower Neches River near Beaumont surging to nearly 1,200% of normal capacity. The Middle Pearl-Strong River region near Jackson, Mississippi, has reached 7,909% of normal flow, creating catastrophic flooding conditions. In Pennsylvania, communities along the Kiskiminetas River near Pittsburgh are experiencing flows at 1,660% of normal, threatening homes and infrastructure, while the French Creek and Middle Allegheny-Tionesta areas have both exceeded 1,000% of normal levels. Ohio is also in crisis, with the Upper Scioto River near Columbus and surrounding areas seeing flows approach 700% of normal. Meanwhile, the Wills Creek region in the Ohio Valley has spiked to 7,028% of normal, creating flash flood emergencies in small towns throughout the watershed.
The flooding emergency extends nationwide, with the Santa Clara area near San Jose, California, recording 1,936% of normal flow, and the Raquette River region near Potsdam, New York, reaching 1,119% of normal. As Hurricane Lowell passes just 90 miles west of Lihue, Hawaii, Kauai County faces its own flooding disaster with flash flood warnings, power outages affecting thousands, and dangerous storm surge inundating coastal communities. The Maumee River near Toledo, Ohio, the Delaware River near Philadelphia, and communities throughout Iowa, Idaho, and Wisconsin are all experiencing significant flooding. Emergency officials warn that with saturated ground conditions and additional rainfall forecast, the situation could worsen rapidly, urging residents in all affected areas to monitor local emergency broadcasts and be prepared to evacuate immediately.
Rivers currently flooding or rising
Live USGS streamgauge readings aggregated by river. Percent-of-normal compares current flow to the seasonal average.
| River | Observed (cfs) | Seasonal avg (cfs) | vs. Normal |
|---|---|---|---|
| Clarion River | 1,620 | 254 | ↑ 638% of normal |
| Black Warrior River | 219 | 2,120 | 10% of normal |
| Scioto River | 1,841 | 269 | ↑ 684% of normal |
| Suwannee River | 10,500 | 12,100 | 87% of normal |
| Raquette River | 811 | 73 | ↑ 1119% of normal |
| Menomonee River | 156 | 25 | ↑ 624% of normal |
| Green River | 297 | 324 | 92% of normal |
| Blanchard River | 369 | 40 | ↑ 916% of normal |
| Middle Raccoon River | 371 | 48 | ↑ 768% of normal |
| Neches River | 26,000 | 2,190 | ↑ 1187% of normal |
| Delaware River | 1,790 | 189 | ↑ 950% of normal |
| Cedar River | 129 | 162 | 80% of normal |
| Maumee River | 5,830 | 781 | ↑ 746% of normal |
| Samish River | 19 | 25 | 77% of normal |
| Tombigbee River | 6,593 | 11,019 | 60% of normal |
| Thief River | 516 | 62 | ↑ 832% of normal |
| North Raccoon River | 234 | 34 | ↑ 696% of normal |
17 rivers are running elevated right now. Create a free account to see the full list, follow your rivers, and get alerts.
Create Free AccountWatersheds running elevated
Aggregated by HUC8 watershed code. Useful for catchment-level flood-risk assessment.
| HUC8 code | Watershed | Observed (cfs) | vs. Normal |
|---|---|---|---|
| h03160106 | Middle Tombigbee-Lubbub | 1,183 | 62% |
| h17110002 | Strait Of Georgia | 19 | 77% |
| h03110205 | Lower Suwannee | 10,500 | 87% |
| h12040104 | Buffalo-San Jacinto | 204 | ↑ 2914% |
| h04100004 | St. Marys | 369 | ↑ 969% |
| h04100005 | Upper Maumee | 1,750 | ↑ 684% |
| h05010008 | Kiskiminetas | 1,950 | ↑ 1660% |
| h05010005 | Clarion | 1,620 | ↑ 638% |
| h05010004 | French | 3,380 | ↑ 991% |
| h05010003 | Middle Allegheny-Tionesta | 2,056 | ↑ 1001% |
| h04100009 | Lower Maumee | 4,080 | ↑ 777% |
| h04040003 | Milwaukee | 156 | ↑ 624% |
| h10290106 | Sac | 1,650 | ↑ 623% |
| h12020003 | Lower Neches | 26,000 | ↑ 1187% |
| h05060001 | Upper Scioto | 1,841 | ↑ 684% |
| h12020007 | Pine Island Bayou | 2,640 | ↑ 15000% |
| h04100008 | Blanchard | 369 | ↑ 916% |
| h05030101 | Upper Ohio | 214 | ↑ 633% |
| h03080103 | Lower St. Johns | 148,534 | 109% |
| h17110012 | Lake Washington | 22 | 101% |
| h17110013 | Duwamish | 297 | 92% |
| h03160201 | Middle Tombigbee-Chickasaw | 5,410 | 59% |
| h10270103 | Delaware | 1,790 | ↑ 950% |
| h03160113 | Lower Black Warrior | 219 | 10% |
| h07100007 | South Raccoon | 371 | ↑ 768% |
| h07100006 | North Raccoon | 234 | ↑ 696% |
| h04150305 | Raquette | 811 | ↑ 1119% |
| h17040201 | Idaho Falls | 371 | ↑ 1461% |
| h12030108 | Richland | 2,336 | ↑ 18053% |
| h03180002 | Middle Pearl-Strong | 435 | ↑ 7909% |
| h07120004 | Des Plaines | 227 | 98% |
| h05040005 | Wills | 577 | ↑ 7028% |
| h18070102 | Santa Clara | 151 | ↑ 1936% |
| h05130202 | Lower Cumberland-Sycamore | 4,860 | ↑ 607% |
| h09020304 | Thief | 516 | ↑ 832% |
35 watersheds are running elevated. Create a free account to see every basin.
Create Free AccountMonitoring & response toolkit
Everything on this page links into Snoflo’s gauge-level data — drill from a national view down to the readings on a single river.
Gauge-level flow reports
Every USGS streamgauge by state — live discharge, gage height, NWS flood stages, and the complete observation history.
Browse gauges →15-day flow forecasts
PULSE probabilistic outlooks on every gauge — median, likely range, and projected stage, refreshed daily.
How PULSE works →Engineering data & reports
Flow-duration statistics, observed peak context, CSV exports, and printable conditions reports for any gauge and date range.
Snoflo for Engineering →Interactive national map
Layer gauges, warnings, watersheds, rain, and recreation across the country on one map.
Open the map →What causes river flooding
Flooding is rarely a single-cause event — multiple factors usually compound. The most common drivers across the U.S.
Heavy rainfall
Persistent rain saturates soils and overwhelms drainage networks. Tropical systems and atmospheric rivers are the worst culprits.
Rapid snowmelt
Spring melt pulses can deliver months of accumulated water in days — especially when warm rain falls on existing snowpack.
Ice jams
Breakup ice can block channels, forcing water to back up and inundate upstream banks. Common on northern rivers in early spring.
Storm surge
Coastal hurricanes push seawater inland. Surge combined with rainfall is the deadliest flood scenario in U.S. history.
Reservoir releases
Controlled dam releases can dramatically increase downstream flow. USACE and USBR publish release schedules, but conditions change fast.
Burn scars
Wildfire-stripped slopes can't absorb rainfall — even modest storms produce dangerous flash floods on burned watersheds for years afterward.
Flood preparedness checklist
Floodwaters rise faster than most people expect. The basics that save lives.
Flood map & river monitoring FAQ
What does "percent of normal" mean?
The current flow at a gauge compared to its seasonal average for this date. 100% means flow is right at the historical norm. 200%+ means twice the typical flow — a strong indicator of flood conditions on small-to-medium rivers. Every gauge-level flow report shows its live percent-of-normal.
What's the difference between a flood watch and a flood warning?
Watch: conditions are favorable for flooding within the next 12–48 hours. Warning: flooding is happening or imminent. Both come from the National Weather Service. Snoflo overlays both as toggleable layers on the map above.
How often does Snoflo's data refresh?
USGS streamgauge readings update every 15 minutes; we re-pull every hour. NWS warning polygons update as the NWS issues them — usually within 5 minutes. FEMA flood zones are static (the National Flood Hazard Layer is updated quarterly).
What is the FEMA flood zone layer?
FEMA's National Flood Hazard Layer (NFHL) shows the 1%-annual-chance ("100-year") and 0.2%-annual-chance ("500-year") floodplains. These are based on long-term hydrologic modeling, not current conditions. Useful for property risk; not a real-time signal.
Can I get an alert when my local river floods?
Yes. Save any USGS gauge as a favorite in the Snoflo iOS app, set a threshold (e.g. "alert me at 20 ft stage"), and you'll get a push the moment it crosses. Free with a Snoflo account.
Is Snoflo a substitute for official warnings?
No. Snoflo is informational. For life-safety decisions always follow guidance from local emergency management, the NWS, and law enforcement.
Get pinged before your river crosses flood stage.
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Track river flooding in real time
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