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 July 22, 2026 · 121 sensors live
Rivers above flood
41
Watersheds elevated
80
Active flood sensors
121
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.

July
22
2026
Flood report
# CATASTROPHIC FLOODING CRISIS UNFOLDS ACROSS NATION AS TROPICAL STORM BERTHA COMPOUNDS EXTREME CONDITIONS

A perfect storm of weather disasters is unfolding across the United States as Tropical Storm Bertha threatens the Gulf Coast while unprecedented flooding devastates communities from Connecticut to Texas. Multiple watersheds are experiencing extreme flooding conditions, with some areas recording streamflow levels exceeding 100,000% of normal—a catastrophic situation that emergency officials are calling historic. The convergence of Tropical Storm Bertha's heavy rainfall with already saturated ground from recent severe weather has created life-threatening flood conditions affecting millions of Americans, prompting widespread evacuations and emergency declarations across multiple states.

The most severe flooding is concentrated in several critical areas. In Texas, communities near the Frio River are facing apocalyptic conditions with streamflow at 105,941% of normal—over 1,000 times typical levels. The Agua Fria River region near Phoenix, Arizona is experiencing similarly catastrophic flooding at 60,465% of normal capacity. Connecticut's Quinnipiac River basin, including areas around New Haven, is overwhelmed at 2,330% of normal, causing extensive road flooding and infrastructure damage. In West Virginia, the Tygart Valley near Elkins is seeing devastating floods at 11,919% of normal, with the Buckhannon River area recording 9,512% of normal streamflow. These extreme conditions have turned roads into rivers, submerged homes, and isolated entire communities. Meanwhile, Ohio communities along the Little Muskingum and Muskingum Rivers near Marietta face critical flooding with levels reaching 13,088% and 3,472% of normal respectively.

As Tropical Storm Bertha churns toward a Louisiana landfall, Gulf Coast communities from Pensacola to Galveston are bracing for additional flooding impacts. New Orleans, still recovering from previous storms, faces the dual threat of street flooding and storm surge. Emergency operations centers have been activated across Louisiana, Mississippi, Alabama, and the Florida Panhandle, with officials distributing sandbags and urging residents to prepare for flash flooding. The storm's slow movement means prolonged rainfall—potentially 6-10 inches in some areas—which will compound existing flood emergencies. Authorities warn that the combination of saturated soils, overwhelmed drainage systems, and Bertha's heavy rainfall creates an exceptionally dangerous situation. Residents in all affected areas should monitor local emergency alerts, avoid flooded roadways, and be prepared to evacuate immediately if ordered by authorities.
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
Neosho River 249 25 ↑ 996% of normal
Clarion River 2,210 269 ↑ 823% of normal
Black Warrior River 6,780 3,980 ↑ 170% of normal
Hawlings River 826 12 ↑ 7000% of normal
Nueces River 19,500 164 ↑ 11890% of normal
Sabinal River 249 6 ↑ 4062% of normal
Frio River 8,380 8 ↑ 105942% of normal
Mill River 317 14 ↑ 2331% of normal
Still River 603 48 ↑ 1256% of normal
Salt River 930 57 ↑ 1632% of normal
Lampasas River 170 9 ↑ 1858% of normal
Delaware River 1,790 189 ↑ 950% of normal
Santa Cruz River 558 1 ↑ 94576% of normal
Pootatuck River 267 13 ↑ 2136% of normal
Nolin River 2,850 248 ↑ 1149% of normal
Pecos River 1,810 0 ↑ 3016667% of normal
Agua Fria River 1,040 2 ↑ 60465% of normal
Little Shenango River 322 37 ↑ 870% of normal
Duck River 5,440 492 ↑ 1106% of normal
Blackwater River 1,180 54 ↑ 2185% of normal
Wild Rice River 29 102 28% of normal
Coginchaug River 185 9 ↑ 2056% of normal
Rippowam River 182 8 ↑ 2193% of normal
Cedar River 29 93 31% of normal
Norwalk River 184 12 ↑ 1533% of normal
Tombigbee River 22,140 23,630 94% of normal
Little Colorado River 2,390 279 ↑ 857% of normal
Guadalupe River 390 33 ↑ 1166% of normal
Little Muskingum River 4,590 36 ↑ 12750% of normal
North Anna River 1,050 59 ↑ 1768% of normal
Green River 179 4 ↑ 4735% of normal
Buckhannon River 11,700 123 ↑ 9512% of normal
Samish River 27 34 78% of normal
Salmon River 358 30 ↑ 1201% of normal
Leona River 253 13 ↑ 1931% of normal
Saugatuck River 589 19 ↑ 3100% of normal
Youghiogheny River 776 52 ↑ 1492% of normal
Eightmile River 220 6 ↑ 3860% of normal
East Verde River 160 11 ↑ 1524% of normal
Casselman River 160 18 ↑ 899% of normal
Middle Fork River 12,500 50 ↑ 24950% of normal

41 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.

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HUC8 code Watershed Observed (cfs) vs. Normal
h03160106 Middle Tombigbee-Lubbub 7,780 ↑ 187%
h01080205 Lower Connecticut 1,141 ↑ 2228%
h01100005 Housatonic 870 ↑ 1438%
h07120004 Des Plaines 277 83%
h05090202 Little Miami 408 ↑ 1347%
h13060001 Pecos Headwaters 1,810 ↑ 3016667%
h01100006 Saugatuck 955 ↑ 2430%
h05030201 Little Muskingum-Middle Island 17,290 ↑ 13089%
h12110108 Lower Frio 5,020 ↑ 1024490%
h15020016 Lower Little Colorado 2,390 ↑ 857%
h12040104 Buffalo-San Jacinto 204 ↑ 2914%
h01100004 Quinnipiac 317 ↑ 2331%
h05040006 Licking 815 ↑ 1269%
h12110106 Upper Frio 3,862 ↑ 14492%
h05010005 Clarion 2,210 ↑ 823%
h05010004 French 184 ↑ 1278%
h05010006 Middle Allegheny-Redbank 4,715 ↑ 921%
h12110103 Upper Nueces 19,500 ↑ 11890%
h17110002 Strait Of Georgia 27 78%
h06040003 Lower Duck 5,440 ↑ 1106%
h05090201 Ohio Brush-Whiteoak 742 ↑ 1942%
h14080202 Mcelmo 236 ↑ 673%
h08010211 Horn Lake-Nonconnah 1,110 ↑ 22653%
h08010210 Wolf 308 ↑ 14000%
h02040104 Middle Delaware-Mongaup-Brodhead 199 ↑ 765%
h05060001 Upper Scioto 2,522 ↑ 862%
h05140201 Lower Ohio-Little Pigeon 152 ↑ 1768%
h15050202 Upper San Pedro 211 ↑ 1648%
h05030106 Upper Ohio-Wheeling 3,870 ↑ 3282%
h12100304 Cibolo 1,224 ↑ 10457%
h05130103 Upper Cumberland-Lake Cumberland 1,230 ↑ 3154%
h12030108 Richland 466 ↑ 5210%
h05030102 Shenango 322 ↑ 870%
h12060202 Middle Brazos-Lake Whitney 289 ↑ 11560%
h03080103 Lower St. Johns 55,387 50%
h05140102 Salt 8,186 ↑ 2720%
h07080105 South Skunk 584 ↑ 779%
h03160201 Middle Tombigbee-Chickasaw 14,360 74%
h10270103 Delaware 1,790 ↑ 950%
h15060203 Lower Verde 160 ↑ 1524%
h15060202 Upper Verde 219 ↑ 99545%
h15060103 Upper Salt 958 ↑ 8858%
h07100008 Lake Red Rock 453 ↑ 2265%
h03160113 Lower Black Warrior 6,780 ↑ 170%
h10290101 Upper Marais Des Cygnes 533 ↑ 1523%
h05020006 Youghiogheny 936 ↑ 1341%
h05020004 Cheat 1,180 ↑ 2185%
h05020005 Lower Monongahela 400 ↑ 658%
h05020003 Upper Monongahela 521 ↑ 1303%
h05020001 Tygart Valley 25,042 ↑ 11919%
h05050009 Coal 1,490 ↑ 656%
h12070203 Lampasas 170 ↑ 1858%
h02060006 Patuxent 826 ↑ 7000%
h12100201 Upper Guadalupe 390 ↑ 1166%
h11070201 Neosho Headwaters 249 ↑ 996%
h15050301 Upper Santa Cruz 558 ↑ 94576%
h12100303 Lower San Antonio 5,810 ↑ 3835%
h05050005 Gauley 399 ↑ 1663%
h08080102 Bayou Teche 1,120 ↑ 1310%
h09020105 Western Wild Rice 29 28%
h15070102 Agua Fria 1,040 ↑ 60465%
h09020201 Devils Lake 227 ↑ 1335%
h11140302 Lower Sulphur 1,270 ↑ 3273%
h03180002 Middle Pearl-Strong 435 ↑ 7909%
h05110002 Barren 1,750 ↑ 2632%
h05110001 Upper Green 4,590 ↑ 1185%
h05040004 Muskingum 691 ↑ 3472%
h05040005 Wills 585 ↑ 5177%
h05030203 Little Kanawha 1,640 ↑ 3990%
h05110005 Lower Green 189 ↑ 3024%
h05100102 South Fork Licking 2,630 ↑ 1212%
h12070205 San Gabriel 397 ↑ 6476%
h05140104 Blue-Sinking 196 ↑ 869%
h02080106 Pamunkey 1,050 ↑ 1768%
h05140103 Rolling Fork 1,310 ↑ 757%
h05140101 Silver-Little Kentucky 196 ↑ 817%
h05130202 Lower Cumberland-Sycamore 4,860 ↑ 607%
h02020005 Schoharie 370 ↑ 1542%
h08020203 Lower St. Francis 2,340 ↑ 727%
h17110012 Lake Washington 22 67%

80 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.