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Lower Monongahela River Project

Locks and Dams 2, 3 and 4 on the Monongahela River in Allegheny, Washington and Westmoreland counties in southwestern Pennsylvania are the three oldest currently operating-navigation facilities on the Monongahela River. These locks experience the highest volume of commercial traffic on the entire Monongahela River Navigation System and the pools created by these facilities provide industrial and municipal water, and are popular with recreational boaters.

The Lower Mon project replaced the nearly 100 year-old fixed-crest dam at Braddock Locks and Dam with a gated dam, will remove Locks and Dam 3 in Elizabeth and construct two new larger locks (Charleroi Locks) at Locks and Dam 4 in Charleroi.

Current Active Construction:

  • Pool 3 Dredging (completed in March, FY2022)
  • Stilling Basin (anticipated to be complete in FY2022)
  • Charleroi River Chamber and Control Tower (anticipated to be complete in FY2024)
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