Allegheny River at C.W. Bill Young Lock and Dam
Highest listed crest 31.10 ftFlood stage 17.0 ft21 crests since 1936
The Allegheny River at C.W. Bill Young Lock and Dam crested at major flood stage 2 times among the 21 crests the National Weather Service lists from 1936 to 2024. The highest, 31.10 ft on March 18, 1936, was major flooding, 14.10 feet above flood stage. 5 other gauges on the Allegheny River crested above flood stage within a week of it, 3 at their own highest listed crest.
The gauge
- Highest listed crest
- 31.10 ft
- March 18, 1936
- Flood stage
- 17.0 ft
- Major flooding from 23.0 ft
- Crests at major
- 2
- 82nd of 170 gauges in Pennsylvania
- Most recent flood crest
- April 13, 2024
- 17.45 ft, minor flooding
Flood stages
The thresholds the National Weather Service uses for this gauge today, and how many listed crests reached each.
| Action stage | 15.0 | 3 | Feb 9, 2019 |
| Flood stage (minor) | 17.0 | 13 | Apr 13, 2024 |
| Moderate flood stage | 20.0 | 3 | Jun 23, 1972 |
| Major flood stage | 23.0 | 2 | Dec 30, 1942 |
Every listed crest
21 crests from 1936 to 2024. Filled: at or above flood stage. Hover a crest for its date and stage.
Crests at or above flood stage, by decade
- These are the crests the local National Weather Service office lists for the gauge: the highest on record and recent crests. Lesser floods between them may be missing, so counts by decade are a floor.
- Categories use today's flood stages. Levees, dams and channel changes since a crest can make old and new stages not directly comparable.
Highest crests
| 1 | Mar 18, 1936 | 31.10 | +14.10 | Major |
| 2 | Dec 30, 1942 | 23.30 | +6.30 | Major |
| 3 | Mar 10, 1964 | 21.40 | +4.40 | Moderate |
| 4 | Jan 22, 1959 | 21.10 | +4.10 | Moderate |
| 5 | Jun 23, 1972 | 20.90 | +3.90 | Moderate |
| 6 | Sep 18, 2004 | 19.80 | +2.80 | Minor |
| 7 | Jan 2, 1979 | 19.20 | +2.20 | Minor |
| 8 | Jan 20, 1996 | 19.10 | +2.10 | Minor |
| 9 | Mar 6, 1964 | 18.60 | +1.60 | Minor |
| 10 | Apr 9, 1987 | 18.40 | +1.40 | Minor |
| 11 | Mar 16, 2007 | 17.90 | +0.90 | Minor |
| 12 | Feb 17, 1976 | 17.80 | +0.80 | Minor |
| 13 | Apr 13, 2024 | 17.45 | +0.45 | Minor |
| 14 | Dec 31, 1990 | 17.40 | +0.40 | Minor |
| 15 | Mar 7, 2011 | 17.19 | +0.19 | Minor |
| 16 | Feb 19, 2022 | 17.07 | +0.07 | Minor |
| 17 | Sep 10, 2004 | 17.00 | 0.00 | Minor |
| 18 | Jan 7, 2005 | 17.00 | 0.00 | Minor |
| 19 | Jan 15, 2005 | 16.50 | −0.50 | Action |
| 20 | Feb 9, 2019 | 16.20 | −0.80 | Action |
| 21 | Mar 24, 2007 | 16.00 | −1.00 | Action |
The worst floods along the Allegheny River
For this gauge's highest crests, the other gauges on the Allegheny River that crested above flood stage within a week.
March 18, 1936: 31.10 ft here, major flooding
- Freeport Lock and DamPA · Mar 18, 1936 · 33.30 ft · Major · its highest
- Natrona Lock and DamPA · Mar 18, 1936 · 32.10 ft · Major · its highest
- Clinton Lock and DamPA · Mar 18, 1936 · 26.40 ft · Major · its highest
- Kittanning Lock and DamPA · Mar 18, 1936 · 24.20 ft · Major
- Mosgrove Lock and DamPA · Mar 18, 1936 · 19.60 ft · Minor
December 30, 1942: 23.30 ft here, major flooding
- Natrona Lock and DamPA · Dec 30, 1942 · 28.40 ft · Major
- Kittanning Lock and DamPA · Dec 30, 1942 · 23.70 ft · Major
- Freeport Lock and DamPA · Dec 30, 1942 · 25.70 ft · Moderate
- Mosgrove Lock and DamPA · Dec 30, 1942 · 21.80 ft · Moderate
- FranklinPA · Dec 30, 1942 · 18.30 ft · Minor
- West HickoryPA · Dec 30, 1942 · 14.76 ft · Minor
March 10, 1964: 21.40 ft here, moderate flooding
- Mosgrove Lock and DamPA · Mar 10, 1964 · 27.70 ft · Major · its highest
- Natrona Lock and DamPA · Mar 10, 1964 · 26.40 ft · Major
- Kittanning Lock and DamPA · Mar 10, 1964 · 24.80 ft · Major
- Freeport Lock and DamPA · Mar 10, 1964 · 25.30 ft · Moderate
- WarrenPA · Mar 6, 1964 · 15.00 ft · Moderate
- FranklinPA · Mar 10, 1964 · 18.60 ft · Minor
- West HickoryPA · Mar 6, 1964 · 14.23 ft · Minor
- SalamancaNY · Mar 6, 1964 · 12.87 ft · Minor
Gauges on the Allegheny River
In USGS station-number order, which runs downstream within a river basin.
| Eldred | PA | 29.10 ft, Jun 23, 1972 | 2 |
| Olean | NY | 26.20 ft, Jun 23, 1972 | 2 |
| Salamanca | NY | 24.01 ft, Jun 23, 1972 | 1 |
| Warren | PA | 19.40 ft, Mar 17, 1865 | 6 |
| West Hickory | PA | 17.83 ft, Jan 25, 1964 | 3 |
| Franklin | PA | 26.00 ft, Feb 27, 1917 | 3 |
| Parker | PA | 29.60 ft, Jan 22, 1959 | 2 |
| Rimer Lock and Dam | PA | 21.80 ft, Jan 22, 1959 | 0 |
| Mosgrove Lock and Dam | PA | 27.70 ft, Mar 10, 1964 | 2 |
| Kittanning Lock and Dam | PA | 30.70 ft, Mar 26, 1913 | 6 |
| Clinton Lock and Dam | PA | 26.40 ft, Mar 18, 1936 | 1 |
| Freeport Lock and Dam | PA | 33.30 ft, Mar 18, 1936 | 1 |
| Natrona Lock and Dam | PA | 32.10 ft, Mar 18, 1936 | 5 |
| C.W. Bill Young Lock and Dam this gauge | PA | 31.10 ft, Mar 18, 1936 | 2 |
| Sharpsburg Lock and Dam | PA | 26.90 ft, Jun 24, 1972 | 1 |
Other gauges in Allegheny County
| Natrona Lock and Dam | 32.10 ft, Mar 18, 1936 | 5 |
| Sharpsburg Lock and Dam | 26.90 ft, Jun 24, 1972 | 1 |
| Carnegie | 25.05 ft, Sep 18, 2004 | 1 |
| Girty's Run | 13.56 ft, Jul 5, 2018 | 0 |
| Etna | 10.28 ft, May 30, 1986 | 0 |
| Braddock Lock and Dam | 35.30 ft, Mar 18, 1936 | 8 |
| Elizabeth Lock and Dam | 32.50 ft, Mar 18, 1936 | 9 |
| Dashields Lock and Dam | 42.80 ft, Mar 18, 1936 | 5 |
| Pittsburgh | 46.00 ft, Mar 18, 1936 | 22 |
| Etna | 14.60 ft, Sep 1, 2021 | 0 |
| Turtle Creek | 11.34 ft, Jun 18, 2009 | 1 |
| Sutersville | 32.50 ft, Oct 16, 1954 | 12 |
Allegheny County: every hazard · River floods across the country · Pennsylvania
NOAA National Water Prediction Service, gauge ACMP1, retrieved October 30, 2026. Stages in feet on the gauge's own datum, not elevation. Crests are as the National Weather Service lists them; preliminary values may be revised.