Major Flood
27 ft
Current Water Level
Gage Height
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Streamflow
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Last Reading
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FLOOD STAGES
Know the flood categories.
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
Moderate Flood
25 ft
Minor Flood
21 ft
Action Stage
15 ft
What Floods at Each Level
36 ft
Water reaches the flood of record...July 1, 1888.
35 ft
Flood waters reach the historic log cabin along Front Street in Greensboro.
34 ft
Flood waters reach the corner of Front and County Streets in Greensboro.
31 ft
Flood waters reach the Bed and Breakfast on County Street in Greensboro.
30.5 ft
Water reaches level of the November 5, 1985 flood.
28.4 ft
Water reaches the level of the St. Patricks Day Flood and crest on March 18, 1936.
25.8 ft
Water reaches the level reached during the rain and snowmelt flood on January 20, 1996.
25 ft
Flood waters reach Martin Ferry Road in the village of Glasworks.
24 ft
The lock walls are overtopped at Grays Landing Lock and Dam.
23.95 ft
Water levels reach the flood levels of the flood of July 29, 2017.
22.78 ft
Water reaches the level reached on March 4, 2015.
21 ft
The lock at Grays Landing Lock and Dam goes out of service, and navigation is suspended.
19 ft
The bike trail floods in Greensboro near County Street.
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Jun 30, 1888 | 36 ft | — |
| Nov 4, 1985 | 30.5 ft | 189,000 cfs |
| Mar 17, 1936 | 28.4 ft | 130,000 cfs |
About This Gauge
USGS Site
NWS LID
GYLP1
River
Monongahela River
County
Fayette, PA
Coordinates
39.8250°N, 79.9231°W
Get Flood Alerts for Monongahela River
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of Monongahela River at Grays Landing Lock and Dam?
The Monongahela River at Grays Landing Lock and Dam gauge is maintained by USGS (site 03072655) and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for Monongahela River at Grays Landing Lock and Dam?
The NWS-defined flood stage for Monongahela River at Grays Landing Lock and Dam is 21 feet. Action stage begins at 15 feet. Moderate flooding starts at 25 feet, and major flooding at 27 feet.
How do I get alerts when Monongahela River rises?
Download StormCast free on Google Play, go to River Gauges, and add Monongahela River at Grays Landing Lock and Dam to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category.
Where is the Monongahela River at Grays Landing Lock and Dam gauge located?
The gauge is located in Fayette County, Pennsylvania at coordinates 39.8250°N, 79.9231°W. USGS site number: 03072655. Data is provided by the U.S. Geological Survey and the National Weather Service.
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Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey, Observations courtesy of U.S. Army Corps of Engineers
- The above river forecast includes future rainfall/snowmelt. Forecast stages may be different if the actual rainfall/snowmelt is different than the forecast rainfall/snowmelt.
- Stage may be affected by ice.