Major Flood
18 ft
Current Water Level
Gage Height
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Streamflow
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Last Reading
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FLOOD STAGES
Know the flood categories.
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
Moderate Flood
11 ft
Minor Flood
8 ft
Action Stage
7 ft
What Floods at Each Level
11 ft
Howard Chapel Road is flooded at the Patuxent River.
8 ft
The parking lot for the Patuxent River State Park at Maryland Route 97 begins to flood.
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Sep 10, 1971 | 18.6 ft | 21,800 cfs |
| Jun 21, 1972 | 16.1 ft | 14,500 cfs |
| Jul 20, 1956 | 14.35 ft | 10,700 cfs |
About This Gauge
USGS Site
NWS LID
PRUM2
River
Patuxent River
County
Montgomery, MD
Coordinates
39.2383°N, 77.0558°W
Get Flood Alerts for Patuxent River
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of Patuxent River near Unity?
The Patuxent River near Unity gauge is maintained by USGS (site 01591000) and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for Patuxent River near Unity?
The NWS-defined flood stage for Patuxent River near Unity is 8 feet. Action stage begins at 7 feet. Moderate flooding starts at 11 feet, and major flooding at 18 feet.
How do I get alerts when Patuxent River rises?
Download StormCast free on Google Play, go to River Gauges, and add Patuxent River near Unity to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category.
Where is the Patuxent River near Unity gauge located?
The gauge is located in Montgomery County, Maryland at coordinates 39.2383°N, 77.0558°W. USGS site number: 01591000. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Gauges on Patuxent River
On This River
Downstream: Patuxent River below Brighton Dam
More Resources
Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey
- Stage may be affected by ice.