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.
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.
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 | 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.
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 | 1,013 | 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.
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.
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