RIVER GAUGE · LONG GREEN CREEK
Long Green Creek at Glen Arm
Baltimore County, Maryland
Water level0.91 ft
Flow2 cfs
Last readingSep 16, 2026, 4:15 PM UTC (last recorded)
Action4 ft
Minor flood7 ft
Moderate flood10 ft
Major flood15 ft
The past week
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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.
Highest crests on record
| Date | Level | 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 |
Get an alert when Long Green Creek rises
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