Monongahela River at Elizabeth Lock and Dam, PA

Flood stages

What floods at each level

From the National Weather Service, highest first.

• 32 ftElizabeth immediately downstream of Lock 3 floods.
• 30.5 ftWater Street, First Street and Second Street in West Elizabeth flood. Flood waters are 4 to 5 feet deep in homes along Water Street.
• 27 ftSerious damage to homes and industries in West Elizabeth. Many roads flood.
• 25.6 ftWater reaches the first floor of numerous homes from the intersection of First and Border Streets north to the intersection of Mill and First streets in West Elizabeth.
• 24.05 ftWater levels reach the flood levels of the flood of July 30, 2017.
• 23 ftIndustrial Chemical Corporation plant floods.
• 22 ftIn West Elizabeth basements of numerous homes in the block bounded by First and Water streets begin to flood.
• 20 ftSmall communities around Lock 3 area begin minor flooding.
• 18.1 ftLock walls overtopped.
• 17.5 ftNavigation suspended, lock out of service.

Highest crests on record

1. 32.5 ft — March 18, 1936
2. 31.6 ft — November 6, 1985
3. 30.3 ft — January 20, 1996
4. 29 ft — June 24, 1972
5. 28.5 ft — October 16, 1954

Recent crests: 24.54 ft (April 4, 2024) · 20.17 ft (February 5, 2022) · 22.87 ft (March 2, 2021) · 20.05 ft (December 18, 2019) · 18.1 ft (February 8, 2019)

Up and down the river, and nearby

• UpstreamMonongahela River at Charleroi Lock and Dam, PA
• DownstreamMonongahela River at Braddock Lock and Dam, PA
• Youghiogheny River at Sutersville, PA
• Turtle Creek at Wilmerding, PA
• Thompson Run at Turtle Creek, PA
• Ohio River at Pittsburgh, PA
• Saw Mill Run at Duquesne Heights, PA
• Chartiers Creek at Carnegie, PA