Major Flood
20 ft
Current Water Level
Gage Height
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Streamflow
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Last Reading
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FLOOD STAGES
Know the flood categories.
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
Moderate Flood
13 ft
Minor Flood
11 ft
Action Stage
9 ft
What Floods at Each Level
20 ft
Water approaches structures near the stream.
13 ft
Water reaches the intersection of Leigh Mill Road and Kelso Road.
11 ft
Leigh Mill Road floods near Difficult Run.
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Jun 21, 1972 | 21.4 ft | 32,200 cfs |
| Sep 8, 2011 | 17.54 ft | 17,000 cfs |
| Sep 5, 2008 | 16.62 ft | 14,300 cfs |
About This Gauge
Get Flood Alerts for Difficult Run
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of Difficult Run near Great Falls?
The Difficult Run near Great Falls gauge is maintained by USGS (site 01646000) and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for Difficult Run near Great Falls?
The NWS-defined flood stage for Difficult Run near Great Falls is 11 feet. Action stage begins at 9 feet. Moderate flooding starts at 13 feet, and major flooding at 20 feet.
How do I get alerts when Difficult Run rises?
Download StormCast free on Google Play, go to River Gauges, and add Difficult Run near Great Falls to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category.
Where is the Difficult Run near Great Falls gauge located?
The gauge is located in Fairfax County, Virginia at coordinates 38.9758°N, 77.2461°W. USGS site number: 01646000. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Gauges on Difficult Run
More Resources
Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey
- Stage may be affected by ice.