Monongahela River at Braddock Lock and Dam

Highest listed crest 35.30 ftFlood stage 22.0 ft24 crests since 1936

The Monongahela River at Braddock Lock and Dam crested at major flood stage 8 times among the 24 crests the National Weather Service lists from 1936 to 2024. The highest, 35.30 ft on March 18, 1936, was major flooding, 13.30 feet above flood stage. 3 other gauges on the Monongahela River crested above flood stage within a week of it, 1 at its own highest listed crest.

The gauge

Highest listed crest: 35.30 ft; March 18, 1936; 300,000 cubic feet per second
Flood stage: 22.0 ft; Major flooding from 24.0 ft
Crests at major: 8; 21st of 170 gauges in Pennsylvania
Most recent flood crest: April 4, 2024; 24.43 ft, major flooding
Location: Allegheny County; Near Munhall (2.1 mi), West Mifflin (3.4 mi), McKeesport (3.6 mi)
Identifiers: NWS BDDP1; USGS 03085000

Flood stages

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

Flood categories, Monongahela River at Braddock Lock and Dam

Action stage	18.2	10	Jul 30, 2017	The level at which the NWS or its partners begin to take action
Flood stage (minor)	22.0	4	Sep 11, 2018	Minimal or no property damage, but possibly some public threat
Moderate flood stage	23.0	1	Nov 20, 2003	Some inundation of structures and roads near the stream
Major flood stage	24.0	8	Apr 4, 2024	Extensive inundation of structures and roads

Every listed crest

24 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

Highest listed crests, Monongahela River at Braddock Lock and Dam

1	Mar 18, 1936	35.30	+13.30	Major	300,000
2	Jun 24, 1972	29.70	+7.70	Major	—
3	Jan 20, 1996	29.10	+7.10	Major	230,000
4	Nov 6, 1985	28.60	+6.60	Major	224,000
5	Oct 16, 1954	28.20	+6.20	Major	—
6	Dec 30, 1942	27.10	+5.10	Major	—
7	Apr 4, 2024	24.43	+2.43	Major	159,379
8	Feb 20, 2000	24.20	+2.20	Major	164,000
9	Nov 20, 2003	23.10	+1.10	Moderate	169,000
10	Feb 17, 2018	22.58	+0.58	Minor	143,500
11	Sep 11, 2018	22.52	+0.52	Minor	143,032
12	Dec 19, 1990	22.00	0.00	Minor	154,000
13	Feb 10, 1994	22.00	0.00	Minor	154,000
14	Jan 29, 1994	21.90	−0.10	Action	153,000
15	Dec 31, 1990	21.80	−0.20	Action	151,000
16	Mar 5, 2015	21.71	−0.29	Action	136,156
17	Feb 7, 2004	21.40	−0.60	Action	146,000
18	Jan 6, 2005	21.40	−0.60	Action	—
19	Mar 7, 2004	21.30	−0.70	Action	129,000
20	Jul 30, 2017	21.13	−0.87	Action	—
21	Feb 24, 2003	20.90	−1.10	Action	—
22	Sep 18, 2004	20.70	−1.30	Action	127,700
23	Mar 21, 2002	20.30	−1.70	Action	—
24	Feb 9, 2019	16.84	−5.16	Below flood stage	99,020

The worst floods along the Monongahela River

For this gauge's highest crests, the other gauges on the Monongahela River that crested above flood stage within a week.

March 18, 1936: 35.30 ft here, major flooding

Charleroi Lock and DamPA · Mar 18, 1936 · 39.90 ft · Major
Elizabeth Lock and DamPA · Mar 18, 1936 · 32.50 ft · Major · its highest
Grays Landing Lock and DamPA · Mar 18, 1936 · 28.40 ft · Major

June 24, 1972: 29.70 ft here, major flooding

Charleroi Lock and DamPA · Jun 23, 1972 · 35.40 ft · Major
Elizabeth Lock and DamPA · Jun 24, 1972 · 29.00 ft · Major
Maxwell Lock and Dam (lower pool)PA · Jun 24, 1972 · 32.60 ft · Minor
Point Marion Lock and Dam (lower pool)PA · Jun 23, 1972 · 26.30 ft · Minor

January 20, 1996: 29.10 ft here, major flooding

Charleroi Lock and DamPA · Jan 20, 1996 · 39.80 ft · Major
Maxwell Lock and Dam (lower pool)PA · Jan 20, 1996 · 37.80 ft · Major
Point Marion Lock and Dam (lower pool)PA · Jan 19, 1996 · 34.00 ft · Major · its highest
Elizabeth Lock and DamPA · Jan 20, 1996 · 30.30 ft · Major
Grays Landing Lock and DamPA · Jan 20, 1996 · 25.80 ft · Moderate

Gauges on the Monongahela River

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

Flood gauges on the Monongahela River

Morgantown Lock and Dam	WV	22.0	27.70 ft, Nov 6, 1985	1
Point Marion Lock and Dam (lower pool)	PA	26.0	34.00 ft, Jan 19, 1996	7
Grays Landing Lock and Dam	PA	21.0	36.00 ft, Jul 1, 1888	3
Maxwell Lock and Dam (lower pool)	PA	32.0	44.40 ft, Nov 5, 1985	5
Charleroi Lock and Dam	PA	28.0	42.70 ft, Nov 5, 1985	14
Elizabeth Lock and Dam	PA	20.0	32.50 ft, Mar 18, 1936	9
Braddock Lock and Dam this gauge	PA	22.0	35.30 ft, Mar 18, 1936	8

Other gauges in Allegheny County

Flood gauges in Allegheny County

C.W. Bill Young Lock and Dam	17.0	31.10 ft, Mar 18, 1936	2
Natrona Lock and Dam	21.0	32.10 ft, Mar 18, 1936	5
Sharpsburg Lock and Dam	21.0	26.90 ft, Jun 24, 1972	1
Carnegie	20.0	25.05 ft, Sep 18, 2004	1
Girty's Run	11.0	13.56 ft, Jul 5, 2018	0
Etna	9.0	10.28 ft, May 30, 1986	0
Elizabeth Lock and Dam	20.0	32.50 ft, Mar 18, 1936	9
Dashields Lock and Dam	25.0	42.80 ft, Mar 18, 1936	5
Pittsburgh	22.0	46.00 ft, Mar 18, 1936	22
Etna	13.0	14.60 ft, Sep 1, 2021	0
Turtle Creek	6.0	11.34 ft, Jun 18, 2009	1
Sutersville	20.0	32.50 ft, Oct 16, 1954	12

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

NOAA National Water Prediction Service, gauge BDDP1, 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.