Allegheny River at Freeport Lock and Dam, PA

The last 7 days and the forecast

NWS forecast issued Mon, Oct 12, 9:20 AM. Forecasts change as rain falls and as upstream water arrives.

Flood stages

What floods at each level

From the National Weather Service, highest first.

• 33.29 ftWater reaches the record flood level of the ST. Patricks Day Flood and crest on March 18, 1936.
• 25 ftSome buildings in the industrial park 1/4 mile upstream from the Lock begin to flood.
• 24.1 ftWater reaches the level reached during Hurricane Ivan September 18, 2004. Freeport received 6 inches of rain.
• 22.8 ftBackwater 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 ftLock walls overtopped.
• 16 ftNavigation suspended. Lock out of service.

Highest crests on record

1. 33.3 ft — March 18, 1936
2. 25.7 ft — December 30, 1942
3. 25.3 ft — March 10, 1964
4. 25 ft — January 20, 1996
5. 24.8 ft — January 22, 1959

Recent crests: 22.52 ft (April 13, 2024) · 19.54 ft (January 29, 2024) · 22.58 ft (February 19, 2022) · 18.5 ft (March 23, 2007) · 23.6 ft (March 16, 2007)

Up and down the river, and nearby

• UpstreamAllegheny River at Clinton Lock and Dam, PA
• DownstreamAllegheny River at Natrona Lock and Dam, PA
• Buffalo Creek (PA) at Iron Bridge, PA
• Kiskiminetas River at Vandergrift, PA
• Crooked Creek at Crooked Creek Dam Tailwater, PA
• Allegheny River at Kittanning Lock and Dam, PA
• Allegheny River at C.W. Bill Young Lock and Dam, PA
• Crooked Creek at Idaho, PA