Difficult Run near Great Falls, VA
River level and flood forecast · Fairfax County
Normal4.0 ftas of Mon 4:15 PM
The river is 7.0 ft below flood stage (11 ft).
Flow: 155 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Sun, Dec 31, 7 PM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 20 ft |
| Moderate flood stage | 13 ft |
| Flood stage | 11 ft |
| Action stage | 9 ft |
| Record crest (June 22, 1972) | 21.4 ft |
What floods at each level
From the National Weather Service, highest first.
- 20 ftWater approaches structures near the stream.
- 13 ftWater reaches the intersection of Leigh Mill Road and Kelso Road.
- 11 ftLeigh Mill Road floods near Difficult Run.
Highest crests on record
- 21.4 ft — June 22, 1972
- 17.54 ft — September 8, 2011
- 16.62 ft — September 6, 2008
- 15.01 ft — June 26, 2006
- 13.82 ft — September 26, 1975
Recent crests: 9.71 ft (September 1, 2021) · 12.95 ft (July 8, 2019) · 11.08 ft (August 1, 2018) · 12.99 ft (July 22, 2018) · 12.23 ft (May 16, 2014)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (GFLV2); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.