TidalMapMattawoman Creek near Pomonkey, MD 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 01658000 sits on Mattawoman Creek and reads everything draining 55 square miles of the Lower Potomac basin. Its datum sits 40 feet above sea level NAVD88. Daily flow has been on record here since 1950, 47 years of it.
Normal flows here
Mattawoman Creek runs a median of 21 cfs at this gauge across 47 years of record. March is the fullest month at a median 61 cfs, and September the leanest at 0.2 cfs. The highest daily mean on record is 5,610 cfs in 1955, and the lowest is 0.0 cfs in 2002.
| Month | Median flow | Share of annual median |
|---|---|---|
| Jan | 45 cfs | 214% |
| Feb | 57 cfs | 271% |
| Mar | 61 cfs | 290% |
| Apr | 54 cfs | 255% |
| May | 27 cfs | 129% |
| Jun | 9.9 cfs | 47% |
| Jul | 1.8 cfs | 9% |
| Aug | 0.9 cfs | 4% |
| Sep | 0.2 cfs | 1% |
| Oct | 2.5 cfs | 12% |
| Nov | 15 cfs | 71% |
| Dec | 35 cfs | 167% |
Medians from the USGS daily-statistics record, 1950 to 2025. A month at 100% is running at its own long-term median.
Flood stages and record crests
Mattawoman Creek reaches flood stage at this gauge at 7 feet. NWS starts watching it at 6 feet. The highest crest on record is 8 feet, in September 2011.
| Category | Gage height |
|---|---|
| Action | 6 ft |
| Minor flooding | 7 ft |
| Moderate flooding | 10 ft |
| Major flooding | 12 ft |
| When | Crest |
|---|---|
| September 2011 | 8 ft |
| May 2008 | 7.9 ft |
| October 2018 | 7.7 ft |
| August 1955 | 7.5 ft |
| July 2019 | 7.4 ft |
Flood categories and crest history from the NOAA National Water Prediction Service, gauge POMM2. Stages are gage height, not depth. Not for navigation.
Nearby river gauges
- Piscataway Creek at Piscataway, MD
- Zekiah Swamp Run near Newtown, MD
- Cameron Run at Alexandria, VA
- Accotink Creek at Keene Mill Rd at Springfield, VA
- Fourmile Run at Alexandria, VA
- Accotink Creek near Annandale, VA
- Long Branch near Annandale, VA
- Tripps Run at Falls Church, VA
- Four Mile Run at Hwy 29 at Falls Church, VA
- Long Branch at Olley Lane near Fairfax, VA
- Beaverdam Creek near Cheverly, MD
- Potomac River near Wash, Dc Little Falls Pump Sta
Live streamflow and gage height: USGS gauge 01658000. Percentile context computed against the gauge's period of record. Not for navigation.
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