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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 14, 2026 · 105 sensors live
Rivers above flood
31
Watersheds elevated
61
Active flood sensors
105
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
14
2026
Flood report
# CATASTROPHIC FLOODING STRIKES MULTIPLE U.S. REGIONS AS STREAMFLOW SURGES TO DANGEROUS LEVELS

A severe flooding crisis is unfolding across multiple states as extreme rainfall has caused rivers and streams to swell to catastrophic levels, with some areas experiencing streamflow rates exceeding 5,000% of normal conditions. The Northeast, Mid-Atlantic, Midwest, and parts of the South are facing life-threatening flash flooding that has left motorists stranded, overwhelmed roads, and prompted urgent warnings from officials to stay home. This crisis comes as Connecticut and neighboring states continue recovering from Sunday's devastating storms that brought flash flooding and widespread power outages, with emergency responders conducting water rescues across the region.

The situation is particularly dire in Ohio and Pennsylvania, where multiple watersheds are experiencing unprecedented flooding. The Licking River watershed near Newark, Ohio, is recording streamflow at an astounding 4,393% of normal, while the Middle Potomac-Catoctin area near Frederick, Maryland, has reached 5,973% of normal levels. In Pennsylvania, the Clarion River near communities like Clarion and Shippenville is flowing at 3,546% of normal with observed rates of 9,290 cubic feet per second. The Shade River in southeastern Ohio has reached 5,120% of normal, creating extremely dangerous conditions in towns like Chester and Shade. Pittsburgh-area rivers including the Youghiogheny near Confluence and the Monongahela near Charleroi are also experiencing major flooding, with the Lower Monongahela at 1,814% of normal.

The flooding emergency extends throughout the Northeast corridor, where the Richland Creek area in Texas has surged to 5,209% of normal, threatening communities near Houston—a region already traumatized by significant flood events since Hurricane Ike. In Connecticut, areas along the Coginchaug River near Middletown are seeing flows at 2,246% of normal, while New Jersey's Hackensack-Passaic watershed affecting communities like Paterson and Passaic is at 1,234% of normal. The Little Kanawha River in West Virginia near Grantsville has reached 4,970% of normal, and the Santa Clara watershed in California is experiencing flows at 4,446% of normal near San Jose. Authorities are urging residents in all affected areas to heed the warning "TURN AROUND, DON'T DROWN" and avoid all flooded roadways, as the combination of overwhelmed drainage systems, saturated ground, and continued rainfall creates life-threatening conditions expected to persist through the coming days.
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 9,290 262 ↑ 3546% of normal
Black Warrior River 3,020 2,430 124% of normal
Chelan River 642 77 ↑ 834% of normal
Suwannee River 1,950 10,700 18% of normal
Mill River 185 10 ↑ 1779% of normal
Still River 401 40 ↑ 1000% of normal
Delaware River 1,790 189 ↑ 950% of normal
Allegheny River 931 105 ↑ 887% of normal
Queen River 162 10 ↑ 1662% of normal
Coginchaug River 158 7 ↑ 2246% of normal
Shade River 768 15 ↑ 5120% of normal
Verdigris River 676 23 ↑ 2908% of normal
Hunt River 298 9 ↑ 3481% of normal
Cedar River 374 220 ↑ 170% of normal
Tombigbee River 7,843 10,859 72% of normal
Souris River 209 24 ↑ 860% of normal
Titicus River 167 12 ↑ 1452% of normal
Blanchard River 177 9 ↑ 1951% of normal
Saugatuck River 463 23 ↑ 2013% of normal
Green River 403 338 119% of normal
Buckhannon River 1,570 100 ↑ 1570% of normal
Samish River 17 26 67% of normal
Wood River 969 56 ↑ 1735% of normal
Whippany River 601 49 ↑ 1234% of normal
Salmon River 158 20 ↑ 778% of normal
Scioto River 13,780 1,562 ↑ 882% of normal
Youghiogheny River 1,919 166 ↑ 1160% of normal
Eightmile River 208 6 ↑ 3270% of normal
Little Tallapoosa River 922 116 ↑ 795% of normal
Cache River 2,990 160 ↑ 1869% of normal
Middle Fork River 570 47 ↑ 1226% of normal

31 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 1,013 63%
h01100006 Saugatuck 841 ↑ 2415%
h01100005 Housatonic 401 ↑ 1000%
h05090202 Little Miami 580 ↑ 2685%
h05090201 Ohio Brush-Whiteoak 187 ↑ 1341%
h01080205 Lower Connecticut 1,057 ↑ 2710%
h11070101 Upper Verdigris 676 ↑ 2908%
h03110205 Lower Suwannee 1,950 18%
h12040104 Buffalo-San Jacinto 204 ↑ 2914%
h05040006 Licking 927 ↑ 4393%
h04100008 Blanchard 177 ↑ 1951%
h10030202 Cut Bank 198 ↑ 676%
h05010005 Clarion 9,617 ↑ 3386%
h07100009 Lower Des Moines 9,960 ↑ 660%
h05010007 Conemaugh 1,396 ↑ 1635%
h05010006 Middle Allegheny-Redbank 7,106 ↑ 2025%
h05010001 Upper Allegheny 1,135 ↑ 938%
h05010003 Middle Allegheny-Tionesta 2,720 ↑ 1293%
h17110002 Strait Of Georgia 17 67%
h05030106 Upper Ohio-Wheeling 1,786 ↑ 3576%
h03100102 Myakka 227 ↑ 1335%
h05060002 Lower Scioto 10,610 ↑ 959%
h05060003 Paint 5,023 ↑ 3429%
h02030103 Hackensack-Passaic 601 ↑ 1234%
h05060001 Upper Scioto 6,125 ↑ 924%
h02030105 Raritan 274 ↑ 1234%
h02050204 Bald Eagle 1,956 ↑ 858%
h02050201 Upper West Branch Susquehanna 6,860 ↑ 928%
h02050202 Sinnemahoning 3,378 ↑ 1729%
h05030101 Upper Ohio 2,135 ↑ 1143%
h03080103 Lower St. Johns 18,265 13%
h02050304 Lower Juniata 487 ↑ 762%
h17110012 Lake Washington 60 ↑ 262%
h17110013 Duwamish 403 119%
h03160201 Middle Tombigbee-Chickasaw 6,830 74%
h10270103 Delaware 1,790 ↑ 950%
h17110010 Snoqualmie 304 ↑ 691%
h11140302 Lower Sulphur 1,270 ↑ 3273%
h09010003 Lower Souris 209 ↑ 860%
h02040201 Crosswicks-Neshaminy 261 ↑ 705%
h03160113 Lower Black Warrior 3,020 124%
h18070102 Santa Clara 349 ↑ 4446%
h05020006 Youghiogheny 2,192 ↑ 1084%
h05020005 Lower Monongahela 528 ↑ 1814%
h02070008 Middle Potomac-Catoctin 902 ↑ 5974%
h05020001 Tygart Valley 2,522 ↑ 1569%
h17020010 Upper Columbia-Entiat 642 ↑ 834%
h11070205 Middle Neosho 203 ↑ 2657%
h01090005 Pawcatuck-Wood 1,131 ↑ 1724%
h01090004 Narragansett 298 ↑ 3481%
h02020006 Middle Hudson 824 ↑ 629%
h12030108 Richland 466 ↑ 5210%
h03180002 Middle Pearl-Strong 435 ↑ 7909%
h07120004 Des Plaines 223 98%
h05030201 Little Muskingum-Middle Island 246 ↑ 4881%
h03150108 Upper Tallapoosa 922 ↑ 795%
h05030203 Little Kanawha 1,337 ↑ 4970%
h05030202 Upper Ohio-Shade 768 ↑ 5120%
h02030101 Lower Hudson 167 ↑ 1452%
h08020302 Cache 2,990 ↑ 1869%
h05130202 Lower Cumberland-Sycamore 4,860 ↑ 607%

61 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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