Braddock New Gated Dam on Monongahela River (tbi9902) Allegheny County, Pennsylvania Innovative 'in the wet' construction began the summer of 2000 on the New Braddock Gated Dam project located approximately 11 miles south of Pittsburgh.
The original Dam was completed in 1906 and was replaced by a gated dam to improve navigation along the lower Monongahela River. The Braddock Locks are located on the Monongahela River and are responsible for transporting 19,000,000 tons of freight per year. Two portions of the dam consisting of football-field-sized precast hollow-core concrete dam segments were constructed at our precast yard located in Leetsdale, Pennsylvania. The larger of the two sections is 333 feet long, 106 feet wide and 40 feet high. Precast panels were assembled in a large basin excavated alongside the Ohio River. The basin was then flooded and the segments were floated out into the river. Each segment was barged upstream through two locks before reaching its final destination. The dam sits on (89) drilled shafts 78" diameter, 40-foot long rock-socketed. When the segments were transported to the site, they were aligned and then submerged in the river to sit on top of the shafts. The new dam stands 82 feet high, about half under water.
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Construction Method: In-the-wet, Precast Concrete
Contract: #DACW59-99-C-0009 Start Date: Notice of Award 07/01/99; Notice to Proceed 08/02/99 Completion Date: 07/01/04 Owner: U.S. Army Corps of Engineers, Pittsburgh District, Engineer/Construction Manager: George R. Reule
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