Allegheny River at Clinton Lock and Dam

Highest listed crest 26.40 ftFlood stage 21.0 ft7 crests since 1936

The Allegheny River at Clinton Lock and Dam crested at major flood stage 1 time among the 7 crests the National Weather Service lists from 1936 to 2019. The highest, 26.40 ft on March 18, 1936, was major flooding, 5.40 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: 26.40 ft; March 18, 1936
Flood stage: 21.0 ft; Major flooding from 24.0 ft
Crests at major: 1; 103rd of 170 gauges in Pennsylvania
Most recent flood crest: June 23, 1972; 22.00 ft, moderate flooding
Location: Armstrong County; Near Lower Burrell (11.7 mi), New Kensington (13.4 mi)
Identifiers: NWS CLNP1; USGS 03039035

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 Clinton Lock and Dam

Action stage	17.0	4	Feb 8, 2019	The level at which the NWS or its partners begin to take action
Flood stage (minor)	21.0	0	—	Minimal or no property damage, but possibly some public threat
Moderate flood stage	22.0	1	Jun 23, 1972	Some inundation of structures and roads near the stream
Major flood stage	24.0	1	Mar 18, 1936	Extensive inundation of structures and roads

Every listed crest

7 crests from 1936 to 2019. 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

Highest listed crests, Allegheny River at Clinton Lock and Dam

1	Mar 18, 1936	26.40	+5.40	Major	—
2	Jun 23, 1972	22.00	+1.00	Moderate	—
3	Sep 18, 2004	20.30	−0.70	Action	170,400
4	Mar 16, 2007	19.80	−1.20	Action	136,730
5	Dec 31, 1990	19.20	−1.80	Action	—
6	Feb 8, 2019	17.90	−3.10	Action	97,600
7	Mar 23, 2007	16.20	−4.80	Below flood stage	80,580

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: 26.40 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
C.W. Bill Young Lock and DamPA · Mar 18, 1936 · 31.10 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

June 23, 1972: 22.00 ft here, moderate flooding

EldredPA · Jun 23, 1972 · 29.10 ft · Major · its highest
Natrona Lock and DamPA · Jun 23, 1972 · 27.50 ft · Major
Sharpsburg Lock and DamPA · Jun 24, 1972 · 26.90 ft · Major · its highest
OleanNY · Jun 23, 1972 · 26.20 ft · Major · its highest
SalamancaNY · Jun 23, 1972 · 24.01 ft · Major · its highest
Kittanning Lock and DamPA · Jun 23, 1972 · 23.70 ft · Major
Freeport Lock and DamPA · Jun 23, 1972 · 24.50 ft · Moderate
Mosgrove Lock and DamPA · Jun 23, 1972 · 21.70 ft · Moderate
C.W. Bill Young Lock and DamPA · Jun 23, 1972 · 20.90 ft · Moderate
ParkerPA · Jun 23, 1972 · 22.30 ft · Minor

Gauges on the Allegheny River

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

Flood gauges on the Allegheny River

Eldred	PA	23.0	29.10 ft, Jun 23, 1972	2
Olean	NY	12.0	26.20 ft, Jun 23, 1972	2
Salamanca	NY	12.0	24.01 ft, Jun 23, 1972	1
Warren	PA	14.0	19.40 ft, Mar 17, 1865	6
West Hickory	PA	14.0	17.83 ft, Jan 25, 1964	3
Franklin	PA	17.0	26.00 ft, Feb 27, 1917	3
Parker	PA	20.0	29.60 ft, Jan 22, 1959	2
Rimer Lock and Dam	PA	19.0	21.80 ft, Jan 22, 1959	0
Mosgrove Lock and Dam	PA	19.0	27.70 ft, Mar 10, 1964	2
Kittanning Lock and Dam	PA	21.0	30.70 ft, Mar 26, 1913	6
Clinton Lock and Dam this gauge	PA	21.0	26.40 ft, Mar 18, 1936	1
Freeport Lock and Dam	PA	23.0	33.30 ft, Mar 18, 1936	1
Natrona Lock and Dam	PA	21.0	32.10 ft, Mar 18, 1936	5
C.W. Bill Young Lock and Dam	PA	17.0	31.10 ft, Mar 18, 1936	2
Sharpsburg Lock and Dam	PA	21.0	26.90 ft, Jun 24, 1972	1

Other gauges in Armstrong County

Flood gauges in Armstrong County

Freeport Lock and Dam	23.0	33.30 ft, Mar 18, 1936	1
Kittanning Lock and Dam	21.0	30.70 ft, Mar 26, 1913	6
Mosgrove Lock and Dam	19.0	27.70 ft, Mar 10, 1964	2
Parker	20.0	29.60 ft, Jan 22, 1959	2
Rimer Lock and Dam	19.0	21.80 ft, Jan 22, 1959	0
Idaho	12.5	19.33 ft, Sep 18, 2004	0
St Charles	17.0	23.90 ft, Jul 19, 1996	1

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

NOAA National Water Prediction Service, gauge CLNP1, 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.