Monongahela River at Grays Landing Lock and Dam, PA
River level and flood forecast · Fayette County
The river is 7.6 ft below flood stage (21 ft).
Forecast to rise to 13.6 ft Mon 8 PM, below the 21 ft flood stage.
Flow: 18,500 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Mon, Oct 12, 1:57 PM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 27 ft |
| Moderate flood stage | 25 ft |
| Flood stage | 21 ft |
| Action stage | 15 ft |
| Record crest (July 1, 1888) | 36 ft |
What floods at each level
From the National Weather Service, highest first.
- 36 ftWater reaches the flood of record...July 1, 1888.
- 35 ftFlood waters reach the historic log cabin along Front Street in Greensboro.
- 34 ftFlood waters reach the corner of Front and County Streets in Greensboro.
- 31 ftFlood waters reach the Bed and Breakfast on County Street in Greensboro.
- 30.5 ftWater reaches level of the November 5, 1985 flood.
- 28.4 ftWater reaches the level of the St. Patricks Day Flood and crest on March 18, 1936.
- 25.8 ftWater reaches the level reached during the rain and snowmelt flood on January 20, 1996.
- 25 ftFlood waters reach Martin Ferry Road in the village of Glasworks.
- 24 ftThe lock walls are overtopped at Grays Landing Lock and Dam.
- 23.95 ftWater levels reach the flood levels of the flood of July 29, 2017.
- 22.78 ftWater reaches the level reached on March 4, 2015.
- 21 ftThe lock at Grays Landing Lock and Dam goes out of service, and navigation is suspended.
- 19 ftThe bike trail floods in Greensboro near County Street.
Highest crests on record
- 36 ft — July 1, 1888
- 30.5 ft — November 5, 1985
- 28.4 ft — March 18, 1936
- 25.8 ft — January 20, 1996
- 24.5 ft — February 19, 2000
Recent crests: 18.95 ft (May 31, 2025) · 21.02 ft (April 4, 2024) · 21.77 ft (March 1, 2021) · 16.4 ft (July 1, 2019) · 15.88 ft (February 13, 2019)
Up and down the river, and nearby
- UpstreamMonongahela River at Point Marion Lock and Dam (lower pool), PA
- DownstreamMonongahela River at Maxwell Lock and Dam (lower pool), PA
- Dunkard Creek at Shannopin, PA
- Cheat River below Lake Lynn, PA
- Tenmile Creek above Jefferson, PA
- Deckers Creek at Morgantown, WV
- Redstone Creek at Waltersburg, PA
- Monongahela River at Morgantown Lock and Dam, WV
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (GYLP1); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.