Monongahela River at Charleroi Lock and Dam, PA
River level and flood forecast · Westmoreland County
Normal11.3 ftas of Mon 4 PM
The river is 16.8 ft below flood stage (28 ft).
Forecast to rise to 14.6 ft Tue 8 AM, below the 28 ft flood stage.
The last 7 days and the forecast
NWS forecast issued Mon, Oct 12, 1:58 PM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 35 ft |
| Moderate flood stage | 31 ft |
| Flood stage | 28 ft |
| Action stage | 22.6 ft |
| Record crest (November 5, 1985) | 42.7 ft |
What floods at each level
From the National Weather Service, highest first.
- 42.7 ftWater reaches the flood of record...Election Day Flood event...November 5, 1985.
- 39.9 ftWater reaches the level of the ST. Patricks Day Flood and crest on March 18, 1936.
- 37 ft50 homes are flooded in Roscoe. Flooding also occurs in the towns of Elco, Allenport, and Stockdale.
- 36 ftSeveral homes are flooded on Lynn Street in Roscoe.
- 35.9 ftWater levels reach the flood levels of the flood of July 30, 2017.
- 35 ftBackwater flooding in Monongahela along Pigeon Creek causes flood waters up to 4.5 feet in businesses in the lowest building in Penos Plaza and up to 6 feet in Armstrong Park. Backwater flooding spreads upstream along Pigeon Creek to the Route 43 overpass on Park Avenue.
- 34.1 ftDivision of American Chain and Cable Co. In Monessen floods.
- 33.15 ftWater reaches the level reached on March 5, 2015.
- 33 ftFlooding is widespread in Fayette City.
- 32 ftFlooding occurs on Connellsville, Fourth, Cook, and Main Streets in Fayette City
- 31.6 ftLock walls overtopped.
- 30 ftBackwater flooding along Pigeon Creek in Monongahela, begins to flood the lowest building in Penos Plaza, Armstrong Park, and closes Wall Street Bridge across Pigeon Creek.
- 29 ftNavigation suspended, lock out of service.
- 28 ftIn Monongahela, backwater flooding along Pigeon Creek begins from the intersection of Park Way and Park Avenue.
- 26.3 ftWater reaches the level reached during Hurricane Ivan September 18, 2004.
- 26 ftRoute 201 in closed due to flooding along Donner's Run.
Highest crests on record
- 42.7 ft — November 5, 1985
- 41.1 ft — March 9, 1967
- 39.9 ft — March 18, 1936
- 39.8 ft — January 20, 1996
- 39.4 ft — March 5, 1963
Recent crests: 32.35 ft (April 4, 2024) · 28.16 ft (February 5, 2022) · 31.56 ft (March 2, 2021) · 28.33 ft (December 18, 2019) · 20.01 ft (February 7, 2019)
Up and down the river, and nearby
- UpstreamMonongahela River at Maxwell Lock and Dam (lower pool), PA
- DownstreamMonongahela River at Elizabeth Lock and Dam, PA
- Youghiogheny River at Sutersville, PA
- Redstone Creek at Waltersburg, PA
- Chartiers Creek at S. Central Ave, PA
- Monongahela River at Braddock Lock and Dam, PA
- Turtle Creek at Wilmerding, PA
- Tenmile Creek above Jefferson, PA
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (CHRP1); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.