RIVER GAUGE · ALLEGHENY RIVER
Allegheny River at Freeport Lock and Dam
Armstrong County, Pennsylvania
Water level11.81 ft
Flow16,800 cfs
Last readingSep 16, 2026, 4:30 PM UTC (last recorded)
Action16 ft
Minor flood23 ft
Moderate flood24 ft
Major flood26 ft
The past week
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What floods at each level
- 33.29 ft
Water reaches the record flood level of the ST. Patricks Day Flood and crest on March 18, 1936.
- 25 ft
Some buildings in the industrial park 1/4 mile upstream from the Lock begin to flood.
- 24.1 ft
Water reaches the level reached during Hurricane Ivan September 18, 2004. Freeport received 6 inches of rain.
- 22.8 ft
Backwater from Buffalo Creek surrounds the sewage disposal plant on Lower Market Street. Basements on First, Second and Lower High and Market Streets in town begin to flood.
- 20.2 ft
Lock walls overtopped.
- 16 ft
Navigation suspended. Lock out of service.
Highest crests on record
| Date | Level | Flow |
|---|---|---|
| Mar 17, 1936 | 33.3 ft | — |
| Dec 29, 1942 | 25.7 ft | — |
| Mar 9, 1964 | 25.3 ft | — |
More on Allegheny River
DownstreamAllegheny River at Natrona Lock and Dam
Allegheny River at C.W. Bill Young Lock and Dam
Allegheny River at Clinton Lock and Dam
Allegheny River at Eldred
Allegheny River at Franklin
Allegheny River at Kittanning Lock and Dam
Allegheny River at Mosgrove Lock and Dam
Allegheny River at Natrona Lock and Dam
Allegheny River at Parker
Allegheny River at Rimer Lock and Dam
Allegheny River at Sharpsburg Lock and Dam
Get an alert when Allegheny River rises
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