RIVER GAUGE · ALLEGHENY RIVER
Allegheny River at Natrona Lock and Dam
Allegheny County, Pennsylvania
Water level12.62 ft
Flow23,000 cfs
Last readingSep 16, 2026, 5:15 PM UTC (last recorded)
Action17.2 ft
Minor flood21 ft
Moderate flood24 ft
Major flood26 ft
The past week
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What floods at each level
- 29.4 ft
Pennsylvania Railroad main line and sidings affected at Tarentum PA, 3 miles downstream floods.
- 21.5 ft
The Natrona Water Company is affected.
- 21.3 ft
Water begins to back up into the sewers at Braeburn Steel Co.
- 21 ft
Lock walls overtopped.
- 18 ft
Navigation suspended, lock out of service.
Highest crests on record
| Date | Level | Flow |
|---|---|---|
| Mar 17, 1936 | 32.1 ft | 365,000 cfs |
| Dec 29, 1942 | 28.4 ft | — |
| Jan 21, 1959 | 27.6 ft | — |
More on Allegheny River
Allegheny River at C.W. Bill Young Lock and Dam
Allegheny River at Clinton Lock and Dam
Allegheny River at Eldred
Allegheny River at Freeport Lock and Dam
Allegheny River at Franklin
Allegheny River at Kittanning Lock and Dam
Allegheny River at Mosgrove 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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