TidalMapDead Run at Whann Avenue near Mclean, VA Water Level Today
NWS river forecast
| When | Stage | Flow |
|---|
Forecast from the NOAA National Water Prediction Service. Issued a few times a day and only while a forecast is active. Not for navigation.
Last 30 days
About this gauge
USGS gauge 01646305 sits on Dead Run and reads everything draining 2.0 square miles of the Middle Potomac-Catoctin basin. Its datum sits 177 feet above sea level NAVD88. Daily flow has been on record here since 2008, 18 years of it.
Where this gauge sits in the drainage
No gauged site sits above this one on the mainstem, so this is the first published reading on the river. Downstream the next reading comes from Potomac River near Wash, Dc Little Falls Pump Sta at 11,560 square miles, so what passes this gauge is about 0% of the water measured there.
Normal flows here
Dead Run runs a median of 1.0 cfs at this gauge across 18 years of record. May is the fullest month at a median 1.4 cfs, and September the leanest at 0.5 cfs. The highest daily mean on record is 311 cfs in 2019, and the lowest is 0.0 cfs in 2008.
| Month | Median flow | Share of annual median |
|---|---|---|
| Jan | 1.2 cfs | 120% |
| Feb | 1.2 cfs | 120% |
| Mar | 1.3 cfs | 130% |
| Apr | 1.3 cfs | 130% |
| May | 1.4 cfs | 140% |
| Jun | 1.1 cfs | 110% |
| Jul | 0.8 cfs | 75% |
| Aug | 0.6 cfs | 55% |
| Sep | 0.5 cfs | 45% |
| Oct | 0.5 cfs | 53% |
| Nov | 0.7 cfs | 72% |
| Dec | 1.0 cfs | 100% |
Medians from the USGS daily-statistics record, 2008 to 2026. A month at 100% is running at its own long-term median.
Flood stages and record crests
Dead Run reaches flood stage at this gauge at 9 feet. NWS starts watching it at 8 feet. The highest crest on record is 10.5 feet, in December 2022.
| Category | Gage height |
|---|---|
| Action | 8 ft |
| Minor flooding | 9 ft |
| Moderate flooding | 10 ft |
| Major flooding | 11 ft |
| When | Crest |
|---|---|
| December 2022 | 10.5 ft |
| July 2019 | 8.2 ft |
| August 2010 | 7.4 ft |
| September 2021 | 7.2 ft |
| September 2011 | 6.8 ft |
Flood categories and crest history from the NOAA National Water Prediction Service, gauge MDRV2. Stages are gage height, not depth. Not for navigation.
Nearby river gauges
- Potomac River near Wash, Dc Little Falls Pump Sta
- Difficult Run near Great Falls, VA
- Four Mile Run at Hwy 29 at Falls Church, VA
- Tripps Run at Falls Church, VA
- Turkey Branch near Rockville, MD
- Fourmile Run at Alexandria, VA
- Accotink Creek near Annandale, VA
- Long Branch near Annandale, VA
- Long Branch at Olley Lane near Fairfax, VA
- Snakeden Branch above Lake Audubon at Reston, VA
- South Fork Little Difficult Run above Mouth near Vienna, VA
- Cameron Run at Alexandria, VA
Live streamflow and gage height: USGS gauge 01646305. Percentile context computed against the gauge's period of record. Not for navigation.
Open Dead Run at Whann Avenue near Mclean, VA on the live chart →
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