Advertisement
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 August 12, 2026 · 143 sensors live
Rivers above flood
38
Watersheds elevated
78
Active flood sensors
143
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.

August
12
2026
Flood report
# CATASTROPHIC FLOODING EMERGENCY GRIPS MIDWEST AND OHIO VALLEY AS DEADLY STORMS UNLEASH HISTORIC WATER LEVELS

**IMMEDIATE THREAT:** Multiple states across the Midwest and Ohio Valley are facing a life-threatening flooding crisis as relentless severe storms have pushed river levels to catastrophic heights, leaving at least two dead, over one million without power, and triggering widespread evacuations. Communities from Ohio to Illinois are experiencing some of the most extreme flooding in decades, with streamflows reaching up to 27,000% of normal levels in some watersheds. Emergency officials warn that dangerous conditions will persist through the weekend as additional storm systems continue to pummel already-saturated regions.

Ohio is experiencing unprecedented devastation, with Columbus and surrounding areas facing the worst impacts. The Scioto River basin, serving Columbus and Portsmouth, has exploded to nearly 3,000% of normal flow, submerging roads and neighborhoods. The situation is even more dire along the Little Muskingum River near Marietta, where flows have reached an incomprehensible 9,111% of normal—transforming normally placid streams into raging torrents. In Newark, the Licking River watershed is at 7,832% of normal, while the Shade River near Chester has surged to 16,763% of normal capacity. Cincinnati faces critical flooding along the Little Miami River (1,412% of normal) and Great Miami River systems, where Dayton is experiencing flows at 2,376% of normal. Governor DeWine has issued urgent warnings about continued flooding threats as storms keep emergency responders overwhelmed across the state.

The crisis extends dramatically beyond Ohio's borders. In Illinois, Chicago is confronting catastrophic urban flooding with the Chicago River at an astounding 2,999% of normal flow, overwhelming drainage systems and flooding basements across the metro area. The Des Plaines River serving suburban communities has reached 1,110% of normal. Indiana faces severe flooding around Lafayette (Tippecanoe River at 1,203% of normal) and along the Whitewater River near Richmond (986% of normal), with water rescues reported in multiple counties. Pennsylvania communities along the Youghiogheny River near Confluence are experiencing 2,060% of normal flows, stranding campers and flooding roads in Somerset County. West Virginia's Gauley River near Summersville has surged to 1,194% of normal, threatening mountain communities. The National Weather Service has issued flash flood emergencies across multiple states, with forecasters warning that the slow-moving storm systems—consistent with research showing hurricanes are now dumping far more rain—will continue producing dangerous flooding conditions 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.

Download situation report (PDF) FREE ACCOUNT CSV FREE ACCOUNT
River Observed (cfs) Seasonal avg (cfs) vs. Normal
Clarion River 2,180 254 ↑ 858% of normal
Black Warrior River 2,390 3,620 66% of normal
Kanawha River 60,600 5,920 ↑ 1024% of normal
Shade River 2,330 14 ↑ 16763% of normal
Olentangy River 1,470 127 ↑ 1157% of normal
Delaware River 1,790 189 ↑ 950% of normal
Santa Cruz River 270 1 ↑ 27551% of normal
Wichita River 538 50 ↑ 1078% of normal
Little Pigeon River 7,930 321 ↑ 2470% of normal
Pecos River 234 38 ↑ 624% of normal
Hocking River 6,550 142 ↑ 4613% of normal
Blackwater River 363 49 ↑ 739% of normal
Guyandotte River 1,810 112 ↑ 1616% of normal
Rapid River 283 29 ↑ 963% of normal
Cedar River 134 218 61% of normal
Thief River 547 84 ↑ 651% of normal
Tombigbee River 17,930 17,875 100% of normal
Blue Earth River 3,100 442 ↑ 701% of normal
Little Calumet River 505 46 ↑ 1110% of normal
Little River 866 142 ↑ 610% of normal
Tuscarawas River 331 36 ↑ 914% of normal
Guadalupe River 171 24 ↑ 710% of normal
Muskingum River 47,000 3,110 ↑ 1511% of normal
Blanchard River 561 43 ↑ 1305% of normal
Green River 258 295 87% of normal
Buckhannon River 2,260 177 ↑ 1277% of normal
Samish River 20 30 67% of normal
Ottawa River 737 9 ↑ 8011% of normal
Gauley River 3,870 324 ↑ 1194% of normal
Virgin River 383 50 ↑ 763% of normal
Stillwater River 438 71 ↑ 618% of normal
Scioto River 37,630 2,927 ↑ 1286% of normal
Williams River 846 70 ↑ 1209% of normal
Cranberry River 653 59 ↑ 1107% of normal
Galien River 259 29 ↑ 890% of normal
Casselman River 2,901 148 ↑ 1956% of normal
Tippecanoe River 6,990 581 ↑ 1203% of normal
Middle Fork River 1,750 61 ↑ 2862% of normal

38 rivers are running elevated right now. Create a free account to see the full list, follow your rivers, and get alerts.

Create Free Account
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 4,180 95%
h04140201 Seneca 174 ↑ 780%
h07120004 Des Plaines 4,422 ↑ 1110%
h05080001 Upper Great Miami 1,359 ↑ 907%
h05080002 Lower Great Miami 499 ↑ 2376%
h05080003 Whitewater 412 ↑ 986%
h05120203 Eel 358 ↑ 1772%
h07120003 Chicago 4,642 ↑ 2999%
h05100202 Middle Fork Kentucky 192 ↑ 616%
h07120006 Upper Fox 155 ↑ 1384%
h09020304 Thief 547 ↑ 651%
h04100007 Auglaize 737 ↑ 8011%
h06020001 Middle Tennessee-Chickamauga 522 ↑ 1246%
h05040006 Licking 2,265 ↑ 7832%
h05120106 Tippecanoe 6,990 ↑ 1203%
h05010005 Clarion 2,180 ↑ 858%
h11140302 Lower Sulphur 1,270 ↑ 3273%
h05010006 Middle Allegheny-Redbank 1,979 ↑ 953%
h04100008 Blanchard 1,110 ↑ 2382%
h05090202 Little Miami 533 ↑ 1412%
h04040001 Little Calumet-Galien 2,700 ↑ 1120%
h05130101 Upper Cumberland 292 ↑ 1825%
h18100200 Salton Sea 326 ↑ 1516%
h09030007 Rapid 283 ↑ 963%
h04110001 Black-Rocky 804 ↑ 1414%
h05030201 Little Muskingum-Middle Island 728 ↑ 9111%
h05060002 Lower Scioto 12,953 ↑ 660%
h17110002 Strait Of Georgia 20 67%
h15010010 Lower Virgin 383 ↑ 763%
h05060001 Upper Scioto 43,245 ↑ 2948%
h05030106 Upper Ohio-Wheeling 765 ↑ 1260%
h06010107 Lower French Broad 7,930 ↑ 2470%
h05070101 Upper Guyandotte 3,680 ↑ 2359%
h02050201 Upper West Branch Susquehanna 926 ↑ 747%
h06010108 Nolichucky 287 ↑ 886%
h05030101 Upper Ohio 6,714 ↑ 3038%
h03080103 Lower St. Johns 198,796 ↑ 139%
h07020012 Lower Minnesota 389 ↑ 846%
h17110012 Lake Washington 19 78%
h17110013 Duwamish 258 87%
h03160201 Middle Tombigbee-Chickasaw 13,750 102%
h10270103 Delaware 1,790 ↑ 950%
h07020009 Blue Earth 3,100 ↑ 701%
h11130206 Wichita 538 ↑ 1078%
h03050103 Lower Catawba 1,976 ↑ 1647%
h03160113 Lower Black Warrior 2,390 66%
h03050101 Upper Catawba 286 ↑ 3531%
h05020006 Youghiogheny 4,474 ↑ 2060%
h05020004 Cheat 363 ↑ 739%
h05020005 Lower Monongahela 290 ↑ 699%
h05020001 Tygart Valley 4,215 ↑ 1582%
h05050009 Coal 3,981 ↑ 2394%
h05050008 Lower Kanawha 60,600 ↑ 1024%
h17040201 Idaho Falls 626 ↑ 887%
h12100201 Upper Guadalupe 171 ↑ 710%
h13060011 Upper Pecos-Black 234 ↑ 624%
h15050301 Upper Santa Cruz 270 ↑ 27551%
h05050005 Gauley 5,726 ↑ 1214%
h12030108 Richland 466 ↑ 5210%
h02020005 Schoharie 429 ↑ 3636%
h03040105 Rocky, North Carolina, 220 ↑ 1833%
h03180002 Middle Pearl-Strong 435 ↑ 7909%
h12040104 Buffalo-San Jacinto 204 ↑ 2914%
h07120007 Lower Fox 352 ↑ 805%
h05030204 Hocking 9,490 ↑ 5486%
h05110001 Upper Green 2,150 ↑ 3245%
h05040004 Muskingum 48,050 ↑ 1540%
h05040005 Wills 159 ↑ 2028%
h05030203 Little Kanawha 2,796 ↑ 4715%
h05030202 Upper Ohio-Shade 2,330 ↑ 16763%
h02030101 Lower Hudson 417 ↑ 874%
h15050202 Upper San Pedro 1,030 ↑ 3759%
h05140102 Salt 736 ↑ 1863%
h06010201 Watts Bar Lake 866 ↑ 610%
h05040001 Tuscarawas 533 ↑ 1205%
h05130202 Lower Cumberland-Sycamore 4,860 ↑ 607%
h05130203 Stones 869 ↑ 953%
h10290101 Upper Marais Des Cygnes 256 ↑ 1016%

78 watersheds are running elevated. Create a free account to see every basin.

Create Free Account
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.