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Allegheny River at Mosgrove Lock and Dam

Highest listed crest 27.70 ftFlood stage 19.0 ft16 crests since 1936

The Allegheny River at Mosgrove Lock and Dam crested at major flood stage 2 times among the 16 crests the National Weather Service lists from 1936 to 2022. The highest, 27.70 ft on March 10, 1964, was major flooding, 8.70 feet above flood stage. 8 other gauges on the Allegheny River crested above flood stage within a week of it.

The gauge

Highest listed crest
27.70 ft
March 10, 1964
Flood stage
19.0 ft
Major flooding from 24.0 ft
Crests at major
2
82nd of 170 gauges in Pennsylvania
Most recent flood crest
February 18, 2022
19.18 ft, minor flooding
Location
Armstrong County
Pennsylvania

Flood stages

The thresholds the National Weather Service uses for this gauge today, and how many listed crests reached each.

Flood categories, Allegheny River at Mosgrove Lock and Dam
Action stage14.03Feb 8, 2019The level at which the NWS or its partners begin to take action
Flood stage (minor)19.09Feb 18, 2022Minimal or no property damage, but possibly some public threat
Moderate flood stage21.02Jun 23, 1972Some inundation of structures and roads near the stream
Major flood stage24.02Mar 10, 1964Extensive inundation of structures and roads

Every listed crest

16 crests from 1936 to 2022. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Allegheny River at Mosgrove Lock and Dam, 1936 to 2022 16182022242628ft Flood stage 19.0 ftMajor 24.0 ft Mar 18, 1936: 19.60 ft, minor floodingDec 30, 1942: 21.80 ft, moderate floodingMar 5, 1964: 25.60 ft, major floodingMar 10, 1964: 27.70 ft, major floodingFeb 14, 1966: 20.80 ft, minor floodingFeb 3, 1970: 17.70 ft, action stageFeb 21, 1972: 20.10 ft, minor floodingJun 23, 1972: 21.70 ft, moderate floodingFeb 17, 1976: 19.30 ft, minor floodingDec 31, 1990: 18.70 ft, action stageSep 10, 2004: 19.00 ft, minor flooding; 136,000 cubic feet per secondSep 18, 2004: 20.40 ft, minor flooding; 158,300 cubic feet per secondMar 16, 2007: 19.20 ft, minor flooding; 140,120 cubic feet per secondMar 7, 2011: 19.08 ft, minor flooding; 137,603 cubic feet per secondFeb 8, 2019: 17.93 ft, action stage; 112,600 cubic feet per secondFeb 18, 2022: 19.18 ft, minor flooding; 139,637 cubic feet per second Highest, 27.70 ft, Mar 10, 1964 19401960198020002020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Allegheny River at Mosgrove Lock and Dam 1930s: 1 1940s: 1 1950s: 0 1960s: 3 3 1970s: 3 1980s: 0 1990s: 0 2000s: 3 2010s: 1 2020s: 1 1930s1940s1950s1960s1970s1980s1990s2000s2010s2020s
  1. 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.
  2. 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

Highest listed crests, Allegheny River at Mosgrove Lock and Dam
1Mar 10, 196427.70+8.70Major—
2Mar 5, 196425.60+6.60Major—
3Dec 30, 194221.80+2.80Moderate—
4Jun 23, 197221.70+2.70Moderate—
5Feb 14, 196620.80+1.80Minor—
6Sep 18, 200420.40+1.40Minor158,300
7Feb 21, 197220.10+1.10Minor—
8Mar 18, 193619.60+0.60Minor—
9Feb 17, 197619.30+0.30Minor—
10Mar 16, 200719.20+0.20Minor140,120
11Feb 18, 202219.18+0.18Minor139,637
12Mar 7, 201119.08+0.08Minor137,603
13Sep 10, 200419.000.00Minor136,000
14Dec 31, 199018.70−0.30Action—
15Feb 8, 201917.93−1.07Action112,600
16Feb 3, 197017.70−1.30Action—

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 10, 1964: 27.70 ft here, major flooding

March 5, 1964: 25.60 ft here, major flooding

December 30, 1942: 21.80 ft here, moderate flooding

Gauges on the Allegheny River

In USGS station-number order, which runs downstream within a river basin.

Flood gauges on the Allegheny River
EldredPA23.029.10 ft, Jun 23, 19722
OleanNY12.026.20 ft, Jun 23, 19722
SalamancaNY12.024.01 ft, Jun 23, 19721
WarrenPA14.019.40 ft, Mar 17, 18656
West HickoryPA14.017.83 ft, Jan 25, 19643
FranklinPA17.026.00 ft, Feb 27, 19173
ParkerPA20.029.60 ft, Jan 22, 19592
Rimer Lock and DamPA19.021.80 ft, Jan 22, 19590
Mosgrove Lock and Dam this gaugePA19.027.70 ft, Mar 10, 19642
Kittanning Lock and DamPA21.030.70 ft, Mar 26, 19136
Clinton Lock and DamPA21.026.40 ft, Mar 18, 19361
Freeport Lock and DamPA23.033.30 ft, Mar 18, 19361
Natrona Lock and DamPA21.032.10 ft, Mar 18, 19365
C.W. Bill Young Lock and DamPA17.031.10 ft, Mar 18, 19362
Sharpsburg Lock and DamPA21.026.90 ft, Jun 24, 19721

Other gauges in Armstrong County

Flood gauges in Armstrong County
Clinton Lock and Dam21.026.40 ft, Mar 18, 19361
Freeport Lock and Dam23.033.30 ft, Mar 18, 19361
Kittanning Lock and Dam21.030.70 ft, Mar 26, 19136
Parker20.029.60 ft, Jan 22, 19592
Rimer Lock and Dam19.021.80 ft, Jan 22, 19590
Idaho12.519.33 ft, Sep 18, 20040
St Charles17.023.90 ft, Jul 19, 19961

Armstrong County: every hazard · River floods across the country · Pennsylvania

NOAA National Water Prediction Service, gauge MOSP1, 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.