The wooden cofferdam (customized floating dry dock) that BIW designed was built and used solely to change propellers on BIW Hull 5 KATAHDIN (US Navy ram). This cofferdam never left Bath; it was strictly a special-purpose shipyard tool.

Ship Specifications
Length 40′ft
Ship Type Wood Cofferdam
Owner Bath Iron Works, KATAHDIN
The wooden cofferdam (customized floating dry dock) that BIW designed was built and used solely to change propellers on BIW Hull 5 KATAHDIN (US Navy ram). This cofferdam never left Bath; it was strictly a special-purpose shipyard tool.
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