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.
**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.
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 |
|---|---|---|---|
| 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.
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 | 1,165 | 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.
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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