Major Flood
15 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
10 ft
Minor Flood
7 ft
Action Stage
4 ft
What Floods at Each Level
15 ft
Multiple spots on Hartley Mill Road are flooded.
11.5 ft
Glen Arm Road begins to flood.
11 ft
Hartley Mill Road begins to flood in spots.
9.5 ft
Water reaches Hillrise Avenue.
7 ft
Water approaches a farm road and Long Green Pike.
4 ft
Water begins to overflow the right bank of the creek but no impacts are observed.
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 |
|---|---|---|
| Jun 30, 1984 | 6.7 ft | 3,250 cfs |
| Feb 23, 2016 | 6.43 ft | 2,790 cfs |
| Nov 15, 2006 | 6.39 ft | 2,730 cfs |
About This Gauge
USGS Site
NWS LID
GALM2
River
Long Green Creek
County
Baltimore, MD
Coordinates
39.4547°N, 76.4789°W
Get Flood Alerts for Long Green Creek
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 Long Green Creek at Glen Arm?
The Long Green Creek at Glen Arm gauge is maintained by USGS (site 01584050) 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 Long Green Creek at Glen Arm?
The NWS-defined flood stage for Long Green Creek at Glen Arm is 7 feet. Action stage begins at 4 feet. Moderate flooding starts at 10 feet, and major flooding at 15 feet.
How do I get alerts when Long Green Creek rises?
Download StormCast free on Google Play, go to River Gauges, and add Long Green Creek at Glen Arm 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 Long Green Creek at Glen Arm gauge located?
The gauge is located in Baltimore County, Maryland at coordinates 39.4547°N, 76.4789°W. USGS site number: 01584050. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Resources
Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey
- Stage may be affected by ice.