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Live flood monitor

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.

Last updated September 8, 2026 · 45 sensors live
Rivers above flood
17
Watersheds elevated
35
Active flood sensors
45
USGS gauges tracked
10K+
Layers
Flow vs. normal
< 50%
~ 100%
200%
500%+
Tiles © Mapbox · Data USGS, NOAA NWS, FEMA, NRCS · Click any feature for details · Multiple layers under your click aggregate into one popup.
Today's flood briefing

What's happening right now

An AI-generated daily summary stitched from active streamgauge readings, NWS warnings, and watershed status.

September
8
2026
Flood report
# CRITICAL FLOODING EMERGENCY: Multiple U.S. Regions Face Catastrophic Water Levels as Hurricane Lowell Devastates Hawaii

**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.
Right now

Rivers currently flooding or rising

Live USGS streamgauge readings aggregated by river. Percent-of-normal compares current flow to the seasonal average.

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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.

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By basin

Watersheds running elevated

Aggregated by HUC8 watershed code. Useful for catchment-level flood-risk assessment.

CSV FREE ACCOUNT
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.

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Background

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.

Safety

Flood preparedness checklist

Floodwaters rise faster than most people expect. The basics that save lives.

1
Never drive through floodwaterSix inches can stall a car; two feet floats most vehicles. Turn around — don't drown.
2
Monitor levels near youTrack the gauges upstream of your location. Snoflo's push alerts can ping you the moment a threshold is crossed.
3
Have an evacuation planKnow two routes out and where higher ground sits. If officials issue an evacuation order, leave — don't wait.
4
Move valuables upDocuments, electronics, and sentimentals to upper floors. Disconnect electrical at the main breaker if water enters the structure.
5
Trust official sourcesNWS warnings and local emergency management are the authoritative source. Snoflo data is informational; always cross-check.
6
After the water recedesDon't return until officials clear the area. Floodwater carries sewage, fuel, and downed power. Document damage before cleanup.
Frequently asked

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.

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