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Advanced Hydrologic Prediction Service
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This probabilistic forecast is issued by the Ohio River Forecast Center.
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About this graph
Forecasts for the Monongahela River at Maxwell Lock and Dam (lower pool) are issued routinely year-round.
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Upstream Gauge - at Grays Landing Lock and Dam Upstream Gauge Downstream Gauge Downstream Gauge - at Charleroi Lock and Dam
Zoom Level:16
Flood Categories (in feet)
Major Flood Stage: 36
Moderate Flood Stage: 34
Flood Stage: 32
Action Stage: 23.5
Low Stage (in feet): -9999

Historic Crests
(1) 44.40 ft on 11/05/1985
(2) 38.20 ft on 03/07/1967
(3) 38.00 ft on 03/05/1963
(4) 37.80 ft on 01/20/1996
(5) 36.50 ft on 02/19/2000
(6) 35.40 ft on 03/20/1963
(7) 33.32 ft on 07/30/2017
(8) 32.60 ft on 06/24/1972
(9) 32.50 ft on 05/25/1968
(10) 32.30 ft on 02/10/1994
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 20.68 ft on 02/08/2019
(2) 30.81 ft on 02/17/2018
(3) 33.32 ft on 07/30/2017
(4) 21.50 ft on 03/15/2015
(5) 30.89 ft on 03/05/2015
(6) 27.30 ft on 05/05/2009
(7) 23.90 ft on 06/05/2008
(8) 29.40 ft on 12/14/2007
(9) 31.40 ft on 11/20/2003
(10) 26.80 ft on 02/24/2003
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 0.00 ft on 01/01/1980
KML Image
Gauge LocationGauge Map Marker
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
40.5 Flooding begins on the lower side of Main Street in Brownsville
35 Homes flood on Middle Street, Liberty Street, Water Street, Broadway Street, River Street, and Axton Street in West Brownsville.
33.5 Lock walls overtopped.
33.32 Water levels reach the flood levels of the flood of July 30, 2017.
32 Low lying areas of West Brownsville begin to flood.
31 Navigation suspended, lock out of service.
28 Middle Street and Liberty Street in West Brownsville are closed due to storm drain system backups, and several homes have basement flooding.
27 Brownsville Road at Albany Tunnel (near Assad Iron and Metal) in Fayette County is closed due to high water.

Other Real-time and/or Archive Data Sources:

Additional Information Collapse
Potential River Levels - Used to
Potential River Levels
Used to Estimate the Chance of Flooding and the Range of Possible River Levels
10 Day (HEFS) 10 Day (NAEFS) 10 Day (GEFS)
HEFS Ensemble NAEFS Ensemble GEFS Ensemble

Note: Use the official hydrograph at the top of this web page for river levels within the next 72 hours.

Collaborative Agencies Collapse
The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
NWS Information
National Weather Service
Pittsburgh Weather Forecast Office
192 Shafer Road
Moon Township, PA 15108
(412) 262-1591
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Page last modified: 2-Nov-2020 7:30 PM
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