Rivers in Pennsylvania
Allegheny River at Natrona Lock and Dam
Below flood stage
12.50ftStage
Observed Thu, Sep 24, 6:15 PM EDT
- Flood stage
- 21.00 ft
- Forecast crest
- 12.50 ftThu, Sep 24, 8:00 PM EDT
- Record crest
- 32.10 ft1936
Flood stages and impacts
| Category | Stage |
|---|---|
| Major flood | 26.00 ft |
| Moderate flood | 24.00 ft |
| Minor flood | 21.00 ft |
| Action | 17.20 ft |
- 29.40 ftPennsylvania Railroad main line and sidings affected at Tarentum PA, 3 miles downstream floods.
- 21.50 ftThe Natrona Water Company is affected.
- 21.30 ftWater begins to back up into the sewers at Braeburn Steel Co.
- 21.00 ftLock walls overtopped.
- 18.00 ftNavigation suspended, lock out of service.
Flood outlook
Chance of flooding, September to November
| Category | Chance |
|---|---|
| Minor flooding | Under 5% |
| 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
15 crests on NOAA’s list since 1936.
| # | Date | Stage |
|---|---|---|
| 1 | March 18, 1936 | 32.10 ft |
| 2 | December 30, 1942 | 28.40 ft |
| 3 | January 22, 1959 | 27.60 ft |
| 4 | June 23, 1972 | 27.50 ft |
| 5 | March 10, 1964 | 26.40 ft |
| 6 | September 18, 2004 | 24.20 ft |
| 7 | January 20, 1996 | 23.10 ft |
| 8 | February 14, 1966 | 22.10 ft |
| 9 | February 17, 1976 | 21.80 ft |
| 10 | March 16, 2007 | 21.40 ft |
| 11 | December 31, 1990 | 20.70 ft |
| 12 | January 7, 2005 | 20.00 ft |
| 13 | February 9, 2019 | 18.63 ft |
| 14 | February 19, 2022 | 18.52 ft |
| 15 | March 24, 2007 | 17.84 ft |
Most recent crests
- February 19, 2022: 18.52 ft
- February 9, 2019: 18.63 ft
- March 24, 2007: 17.84 ft
- March 16, 2007: 21.40 ft
- January 7, 2005: 20.00 ft
- September 18, 2004: 24.20 ft
- January 20, 1996: 23.10 ft
- December 31, 1990: 20.70 ft
- February 17, 1976: 21.80 ft
- June 23, 1972: 27.50 ft
Nearby
Upstream, downstream and the gauges around this one.
- UpstreamAllegheny River at Freeport Lock and Dam
- DownstreamAllegheny River at C.W. Bill Young Lock and Dam
- Buffalo Creek (PA) at Freeport/ Iron Bridge
- Buffalo Creek (PA) at Iron Bridge
- Kiskiminetas River at Vandergrift
- Allegheny River at Clinton Lock and Dam
- Crooked Creek at Crooked Ck. Dam Pool
- Crooked Creek at Crooked Creek Dam Tailwater
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.