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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 1, 2026 · 40 sensors live
Rivers above flood
15
Watersheds elevated
32
Active flood sensors
40
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
1
2026
Flood report
# CRITICAL FLOODING CRISIS: Multiple U.S. Watersheds Face Catastrophic Water Levels as Tropical Storm Edouard Threatens Gulf Coast

**NATIONAL FLOODING EMERGENCY ACROSS MULTIPLE STATES**

A dangerous flooding situation is unfolding across the nation as extreme streamflow levels threaten communities from Utah to Connecticut, while Tropical Storm Edouard bears down on the Texas-Louisiana border with the potential to strengthen into a hurricane. The most alarming conditions exist in southern Utah, where the Escalante River near Escalante has surged to an unprecedented 311,278% of normal flow—jumping from less than 1 cubic foot per second to over 2,000. Meanwhile, the Purgatoire River near Trinidad, Colorado, has exploded to 36,080% of normal levels, threatening flash flooding in downtown Trinidad and surrounding communities. These extreme conditions come as Tropical Storm Edouard approaches the Gulf Coast with forecasts of torrential rainfall that could exacerbate already dangerous flooding in Southeast Texas and Louisiana, prompting school closures and emergency preparations across the Houston metropolitan area.

**WESTERN AND SOUTHWESTERN STATES FACE UNPRECEDENTED WATER SURGES**

The situation in Utah and surrounding states demands immediate attention as multiple watersheds experience catastrophic flooding. The Paria River near Kanab, Utah has reached 10,633% of normal flow, creating severe flash flood risks in the tourist-heavy areas near the Arizona border. The Dirty Devil River near Hanksville sits at 5,955% of normal, while the San Rafael River near Green River, Utah has surged to 4,985% of normal levels—all posing immediate threats to remote communities and critical infrastructure. In Nevada, the Virgin River system serving Mesquite and communities near the Arizona border has reached 1,615% of normal flow. The Richland watershed in eastern Washington, serving areas near the Tri-Cities region, has exploded to an astonishing 25,542% of normal flow, creating extreme flood dangers for Richland, Kennewick, and Pasco. These unprecedented levels are overwhelming drainage systems and threatening homes, businesses, and transportation corridors.

**GULF COAST AND EASTERN STATES BRACE FOR COMPOUND FLOODING THREATS**

As Tropical Storm Edouard threatens to reach hurricane strength before making landfall near the Texas-Louisiana border, communities in Southeast Texas including Houston, Beaumont, and Port Arthur face the dual threat of storm surge and inland flooding. The Middle Pearl-Strong watershed serving communities near Jackson, Mississippi already shows flows at 7,909% of normal. In Connecticut, the Saugatuck watershed serving Westport and surrounding towns has reached 9,956% of normal flow, creating urban flooding emergencies in Fairfield County. The Wills Creek system near Cumberland, Maryland sits at 8,691% of normal, while Louisiana's Lower Sulphur watershed near Lake Charles—directly in Edouard's projected path—already shows elevated flows at 3,273% of normal. Officials across these regions have issued urgent warnings for residents to prepare for rapidly rising waters, avoid flood-prone areas, and monitor emergency alerts as conditions continue to deteriorate.
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
Sangamon River 189 17 ↑ 1109% of normal
Black Warrior River 2,560 3,860 66% of normal
Rooster River 224 2 ↑ 9956% of normal
Suwannee River 5,590 7,475 75% of normal
Green River 310 318 98% of normal
Little Colorado River 623 47 ↑ 1331% of normal
Duchesne River 310 35 ↑ 876% of normal
Paria River 2,419 23 ↑ 10633% of normal
Delaware River 1,790 189 ↑ 950% of normal
Cedar River 170 198 86% of normal
Escalante River 2,070 1 ↑ 311278% of normal
Samish River 23 25 91% of normal
Tombigbee River 6,965 14,035 50% of normal
Virgin River 1,857 115 ↑ 1615% of normal
Purgatoire River 6,350 18 ↑ 36080% of normal

15 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 1,165 56%
h01100006 Saugatuck 224 ↑ 9956%
h12030108 Richland 2,346 ↑ 25542%
h17110002 Strait Of Georgia 23 91%
h14070005 Escalante 2,070 ↑ 311278%
h14070004 Dirty Devil 1,310 ↑ 5955%
h14070007 Paria 2,419 ↑ 10633%
h03110205 Lower Suwannee 5,590 75%
h15020016 Lower Little Colorado 623 ↑ 1331%
h14060009 San Rafael 840 ↑ 4985%
h11140302 Lower Sulphur 1,270 ↑ 3273%
h14060003 Duchesne 310 ↑ 876%
h17040201 Idaho Falls 355 ↑ 947%
h03080103 Lower St. Johns 69,606 58%
h03080101 Upper St. Johns 289 ↑ 785%
h17110013 Duwamish 310 98%
h03160201 Middle Tombigbee-Chickasaw 5,800 48%
h10270103 Delaware 1,790 ↑ 950%
h15010010 Lower Virgin 787 ↑ 1236%
h03160113 Lower Black Warrior 2,560 66%
h05130202 Lower Cumberland-Sycamore 4,860 ↑ 607%
h11020010 Purgatoire 6,350 ↑ 36080%
h15010008 Upper Virgin 1,070 ↑ 2084%
h03090103 Western Okeechobee Inflow 621 ↑ 685%
h17110012 Lake Washington 20 87%
h03180002 Middle Pearl-Strong 435 ↑ 7909%
h11010014 Little Red 3,220 ↑ 921%
h12040104 Buffalo-San Jacinto 204 ↑ 2914%
h07120004 Des Plaines 375 ↑ 152%
h05040005 Wills 684 ↑ 8691%
h03040203 Lumber 276 ↑ 1263%
h07130006 Upper Sangamon 189 ↑ 1109%

32 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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