TidalMapMarsh Run at Grimes, 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 01617800 sits on Marsh Run and reads everything draining 19 square miles of the Conococheague-Opequon basin. Its datum sits 354 feet above sea level NAVD88. Daily flow has been on record here since 1964, 63 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 at Harpers Ferry, WV at 6,290 square miles, so what passes this gauge is about 0% of the water measured there. Water passing here goes on to Potomac River at Burkittsville Rd at Brunswick, MD and Potomac River at Point of Rocks, MD.
Normal flows here
Marsh Run runs a median of 9.2 cfs at this gauge across 63 years of record. March is the fullest month at a median 16 cfs, and October the leanest at 4.9 cfs. The highest daily mean on record is 233 cfs in 2003, and the lowest is 0.0 cfs in 1978.
| Month | Median flow | Share of annual median |
|---|---|---|
| Jan | 11 cfs | 120% |
| Feb | 12 cfs | 130% |
| Mar | 16 cfs | 174% |
| Apr | 15 cfs | 163% |
| May | 14 cfs | 152% |
| Jun | 10 cfs | 109% |
| Jul | 8.0 cfs | 87% |
| Aug | 6.2 cfs | 67% |
| Sep | 5.0 cfs | 54% |
| Oct | 4.9 cfs | 53% |
| Nov | 5.3 cfs | 58% |
| Dec | 8.1 cfs | 88% |
Medians from the USGS daily-statistics record, 1964 to 2027. A month at 100% is running at its own long-term median.
Flood stages and record crests
Marsh Run reaches flood stage at this gauge at 6 feet. NWS starts watching it at 4 feet. The highest crest on record is 4.5 feet, in February 1985.
| Category | Gage height |
|---|---|
| Action | 4 ft |
| Minor flooding | 6 ft |
| Moderate flooding | 7 ft |
| Major flooding | 10 ft |
| When | Crest |
|---|---|
| February 1985 | 4.5 ft |
| February 1979 | 4.4 ft |
| September 2003 | 4.1 ft |
Flood categories and crest history from the NOAA National Water Prediction Service, gauge GRMM2. Stages are gage height, not depth. Not for navigation.
Nearby river gauges
- Antietam Creek near Sharpsburg, MD
- Potomac River at Harpers Ferry, WV
- Conococheague Creek at Fairview, MD
- Piney Run near Lovettsville, VA
- Catoctin Creek near Middletown, MD
- Potomac River at Burkittsville Rd at Brunswick, MD
- Antietam Creek near Waynesboro, PA
- Licking Creek at Pectonville, MD
- Fishing Creek at Mountaindale, MD
- Catoctin Creek at Taylorstown, VA
- Potomac River at Point of Rocks, MD
- North Fork Catoctin Creek at Rt 681 near Waterford, VA
Live streamflow and gage height: USGS gauge 01617800. Percentile context computed against the gauge's period of record. Not for navigation.
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