Rivers in Pennsylvania
Monongahela River at Point Marion Lock and Dam (lower pool)
Below flood stage
13.77ftStage
Observed Thu, Sep 24, 5:15 AM EDT
- Flood stage
- 26.00 ft
- Forecast crest
- 14.20 ftSun, Sep 27, 2:00 AM EDT
- Record crest
- 34.00 ft1996
Flood stages and impacts
| Category | Stage |
|---|---|
| Major flood | 28.00 ft |
| Moderate flood | 27.00 ft |
| Minor flood | 26.00 ft |
| Action | 20.00 ft |
- 45.00 ftFlood waters extend to near the railroad tracks.
- 44.40 ftWater reaches the flood of record...Election Day Flood event...November 5, 1985.
- 40.00 ftFlood waters extend to main and cheat streets.
- 35.00 ftFlood waters reach portions of Fourth, Water, Second, Broadway, and Home Streets in Point Marion.
- 34.00 ftFlood waters reach homes on Water Street, and the lock walls are overtopped at Point Marion Locks and Dam.
- 30.36 ftWater levels reach the flood levels of the flood of July 29, 2017.
- 29.70 ftThe first floors of about twenty-five homes in Point Marion are flooded, and backwater flooding occurs along Camp Run.
- 29.00 ftThe locks go out of service at the Point Marion Locks and Dam, and navigation is suspended. Flood waters reach Water Street near the intersection with Penn Street in Point Marion.
- 27.97 ftWater reaches the level reached on March 4, 2015.
- 27.50 ftFlood waters reach the access road to Point Marion Locks and Dam about 0.8 of a mile below the dam.
- 26.00 ftBasement flooding begins in some homes and businesses in Point Marion.
Flood outlook
Chance of flooding, September to November
| Category | Chance |
|---|---|
| Minor flooding | 7% |
| Moderate flooding | Under 5% |
| Major flooding | Under 5% |
The three-month chances are the River Forecast Centers’ long-range flood outlook, issued September 22, 2026.
Crest history
35 crests on NOAA’s list since 1963.
| # | Date | Stage |
|---|---|---|
| 1 | January 19, 1996 | 34.00 ft |
| 2 | March 7, 1967 | 33.50 ft |
| 3 | February 19, 2000 | 32.30 ft |
| 4 | March 5, 1963 | 31.80 ft |
| 5 | July 29, 2017 | 30.30 ft |
| 6 | March 20, 1963 | 30.20 ft |
| 7 | May 24, 1968 | 29.70 ft |
| 8 | March 4, 2015 | 27.97 ft |
| 9 | February 17, 2018 | 27.66 ft |
| 10 | January 26, 1978 | 27.60 ft |
| 11 | June 6, 1981 | 27.40 ft |
| 12 | August 18, 1980 | 27.20 ft |
| 13 | June 24, 1974 | 27.00 ft |
| 14 | December 14, 2007 | 27.00 ft |
| 15 | January 11, 1974 | 27.00 ft |
| 16 | March 1, 2021 | 26.90 ft |
| 17 | June 23, 1972 | 26.30 ft |
| 18 | December 9, 1978 | 26.20 ft |
| 19 | May 4, 2009 | 26.19 ft |
| 20 | November 20, 2003 | 25.60 ft |
| 21 | March 21, 2002 | 25.30 ft |
| 22 | January 26, 2010 | 25.10 ft |
| 23 | October 10, 1976 | 24.60 ft |
| 24 | February 7, 2004 | 24.50 ft |
| 25 | June 5, 2008 | 23.65 ft |
Most recent crests
- March 1, 2021: 26.90 ft
- February 8, 2019: 18.99 ft
- September 28, 2018: 22.40 ft
- February 17, 2018: 27.66 ft
- July 29, 2017: 30.30 ft
- March 15, 2015: 21.63 ft
- March 4, 2015: 27.97 ft
- January 26, 2010: 25.10 ft
- May 4, 2009: 26.19 ft
- June 5, 2008: 23.65 ft
Nearby
Upstream, downstream and the gauges around this one.
What this means
Forecasts by the Ohio River Forecast Center. Forecasts are issued routinely year-round. 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.
Sources
Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service. Streamflow and the daily record from the U.S. Geological Survey.