TidalMapWhitemarsh Run near Fullerton, 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 01585090 sits on Whitemarsh Run and reads everything draining 2.7 square miles of the Gunpowder-Patapsco basin. Its datum sits 120 feet above sea level NAVD88. Daily flow has been on record here since 1995, 30 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 Whitemarsh Run at White Marsh, MD at 7.6 square miles, so what passes this gauge is about 36% of the water measured there.
Normal flows here
Whitemarsh Run runs a median of 1.4 cfs at this gauge across 30 years of record. February is the fullest month at a median 2.2 cfs, and September the leanest at 0.8 cfs. The highest daily mean on record is 293 cfs in 2010, and the lowest is 0.0 cfs in 2002.
| Month | Median flow | Share of annual median |
|---|---|---|
| Jan | 1.9 cfs | 136% |
| Feb | 2.2 cfs | 157% |
| Mar | 2.2 cfs | 157% |
| Apr | 2.0 cfs | 143% |
| May | 1.7 cfs | 121% |
| Jun | 1.1 cfs | 82% |
| Jul | 1.0 cfs | 69% |
| Aug | 0.9 cfs | 61% |
| Sep | 0.8 cfs | 56% |
| Oct | 1.0 cfs | 70% |
| Nov | 1.1 cfs | 79% |
| Dec | 1.6 cfs | 114% |
Medians from the USGS daily-statistics record, 1995 to 2025. A month at 100% is running at its own long-term median.
Flood stages and record crests
Whitemarsh Run reaches flood stage at this gauge at 10 feet. NWS starts watching it at 5 feet. The highest crest on record is 7.9 feet, in July 2019.
| Category | Gage height |
|---|---|
| Action | 5 ft |
| Minor flooding | 10 ft |
| Moderate flooding | 18 ft |
| Major flooding | 20 ft |
| When | Crest |
|---|---|
| July 2019 | 7.9 ft |
| June 2015 | 7.6 ft |
| February 2016 | 7.5 ft |
| May 2018 | 7.2 ft |
| June 2021 | 7.2 ft |
Flood categories and crest history from the NOAA National Water Prediction Service, gauge FLRM2. Stages are gage height, not depth. Not for navigation.
Nearby river gauges
- Whitemarsh Run at White Marsh, MD
- Honeygo Run near White Marsh, MD
- Moores Run at Radecke Ave at Baltimore, MD
- Minebank Run near Glen Arm, MD
- Long Green Creek at Glen Arm, MD
- Herring Run at Sinclair Lane at Baltimore, MD
- West Branch Herring Run at Idlewylde, MD
- Long Quarter Branch at Lutherville, MD
- Little Gunpowder Falls at Laurel Brook, MD
- Foster Branch near Joppatowne, MD
- Beaverdam Run at Cockeysville, MD
- Wheel Creek near Abingdon, MD
Live streamflow and gage height: USGS gauge 01585090. Percentile context computed against the gauge's period of record. Not for navigation.
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