TidalMapWhitemarsh Run at White Marsh, 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 01585100 sits on Whitemarsh Run and reads everything draining 7.6 square miles of the Gunpowder-Patapsco basin. Its datum sits 34 feet above sea level NAVD88. Daily flow has been on record here since 1959, 64 years of it.
Where this gauge sits in the drainage
One gauged site sits upstream of here. The closest is Whitemarsh Run near Fullerton, MD, reading 2.7 square miles. This gauge adds the 4.9 square miles that drain in between.
Normal flows here
Whitemarsh Run runs a median of 4.0 cfs at this gauge across 64 years of record. March is the fullest month at a median 6.5 cfs, and September the leanest at 2.0 cfs. The highest daily mean on record is 1,100 cfs in 2010, and the lowest is 0.1 cfs in 1966.
| Month | Median flow | Share of annual median |
|---|---|---|
| Jan | 5.2 cfs | 130% |
| Feb | 6.4 cfs | 160% |
| Mar | 6.5 cfs | 162% |
| Apr | 5.8 cfs | 145% |
| May | 4.4 cfs | 110% |
| Jun | 3.2 cfs | 80% |
| Jul | 2.5 cfs | 62% |
| Aug | 2.4 cfs | 60% |
| Sep | 2.0 cfs | 50% |
| Oct | 2.4 cfs | 60% |
| Nov | 3.3 cfs | 82% |
| Dec | 4.7 cfs | 118% |
Medians from the USGS daily-statistics record, 1959 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 11 feet. NWS starts watching it at 9 feet. The highest crest on record is 18.5 feet, in August 1971.
| Category | Gage height |
|---|---|
| Action | 9 ft |
| Minor flooding | 11 ft |
| Moderate flooding | 15 ft |
| Major flooding | 18 ft |
| When | Crest |
|---|---|
| August 1971 | 18.5 ft |
| September 2010 | 16.7 ft |
| August 1978 | 16.2 ft |
| June 2015 | 16.1 ft |
| September 1971 | 15.9 ft |
Flood categories and crest history from the NOAA National Water Prediction Service, gauge WHMM2. Stages are gage height, not depth. Not for navigation.
Nearby river gauges
- Honeygo Run near White Marsh, MD
- Whitemarsh Run near Fullerton, MD
- Long Green Creek at Glen Arm, MD
- Moores Run at Radecke Ave at Baltimore, MD
- Foster Branch near Joppatowne, MD
- Minebank Run near Glen Arm, MD
- Herring Run at Sinclair Lane at Baltimore, MD
- Little Gunpowder Falls at Laurel Brook, MD
- West Branch Herring Run at Idlewylde, MD
- Wheel Creek near Abingdon, MD
- Plumtree Run near Bel Air, MD
- Long Quarter Branch at Lutherville, MD
Live streamflow and gage height: USGS gauge 01585100. Percentile context computed against the gauge's period of record. Not for navigation.
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