Patapsco River at Ellicott City
Maryland — Water Level & Flood Stage
Located in Baltimore County, Maryland on the Patapsco River. Live water level data from USGS, updated every 15 minutes.
Current Water Level
Gage Height
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Streamflow
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Last Reading
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This is an NWS forecast point (LID: ELPM2). Live data may be limited. View on NWS AHPS →
Flood Stages
Major Flood
127 ft
Moderate Flood
125 ft
Minor Flood
122.5 ft
Action Stage
121.5 ft
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
What Floods at Each Level
127 ft
Major flooding is occurring in lower Old Town Ellicott City. The flooding will be even more significant if local rainfall has occurred, causing additional backwater flooding.
125 ft
Main Street in Ellicott City is flooded near the railroad bridge with water either approaching or entering buildings. Backwater flooding may be occurring further upstream if local rainfall has occurred.
124 ft
Main Street in Ellicott City begins to flood both near 8000 Main Street and near the intersection of Main Street and Maryland Avenue.
122 ft
Water exceeds the banks and approaches an access road adjacent to 8000 Main Street in Ellicott City.
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 |
|---|---|---|
| May 27, 2018 | 124.78 ft | — |
| May 27, 2018 | 124.78 ft | — |
| Jun 3, 2018 | 122.6 ft | — |
| Jun 3, 2018 | 122.6 ft | — |
About This Gauge
NWS LID
ELPM2
River
Patapsco River
County
Baltimore, MD
Coordinates
39.2683°N, 76.7939°W
Get Flood Alerts for Patapsco 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 Patapsco River at Ellicott City?
The Patapsco River at Ellicott City gauge is maintained by USGS 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 Patapsco River at Ellicott City?
The NWS-defined flood stage for Patapsco River at Ellicott City is 122.5 feet. Action stage begins at 121.5 feet. Moderate flooding starts at 125 feet, and major flooding at 127 feet.
How do I get alerts when Patapsco River rises?
Download StormCast free on Google Play, go to River Gauges, and add Patapsco River at Ellicott City to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category — even when your screen is off.
Where is the Patapsco River at Ellicott City gauge located?
The gauge is located in Baltimore County, Maryland at coordinates 39.2683°N, 76.7939°W. Data is provided by the U.S. Geological Survey and the National Weather Service.
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Source & Notes
- Stage may be affected by ice.