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Crews Replace Century-Old Miter Gate


A group of construction workers heavy lifting a miter gate on a jobsite.
Derrick Barge 24 using specialized lifting equipment to remove the existing miter gate in November 2023. Photo credit: A. Leal de la Torre—Sr. Graphic Designer

Manson Construction Co. was selected by the U.S. Army Corps of Engineers (USACE) to replace the large lock center gate at the Hiram M. Chittenden (Ballard) Locks in Seattle, WA. In October, Manson crews removed the more than 100-year-old gate using the DERRICK BARGE 24. Crews will continue construction activities and will install a new miter gate assembly in 2024 that consists of two leafs, measuring 46 ft. by 60 ft. and weighing 180 tons each.


The project is crucial to U.S. Commerce and vessel traffic, with the Ballard Locks providing passage for more than 50,000 vessels a year and maintaining water levels for both Lake Washington and Lake Union.


Fun Fact: In 1945, Manson rebuilt the shear walls at the Ballard Locks for the U.S. Government, placing a fendering system to improve the approaches of the Locks. (Source: Bridging the Generations)










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