Bath Iron Works Sinking Basin Maintenance Dredging 2009

In 2009, CASHMAN was contracted to conduct its first phase of maintenance dredging at the Bath Iron Works (BIW) dry-dock sinking basin. BIW is a major U.S. shipyard located on the Kennebec River and since its founding in 1884, has built private, commercial and military vessels, most of which have been ordered by the U.S. Navy. Part of General Dynamics Marine Systems, Bath Iron Works is a full-service shipyard specializing in the design, building and support of complex surface combatants for the U.S. Navy. The shipyard has built and designed battleships, frigates, cruisers and destroyers, including the Arleigh Burke class, which are currently among the world’s most advanced surface warships. 


  • Dredged ~30,000 cubic yards of material from the Bath Iron Works (BIW) 850’ by 280’ dry dock sinking basin. 
  • Dredging was performed to depths of 75 feet with a 1-ft overdredge allowance. 
  • Work was completed using the clamshell dredge F.J. Belesimo with a 12-CY heavy digging bucket, as well as using one 4,000-CY split-hull barge. 
  • Dredged material was transported to the in-river disposal site at Bluff Head, in the Kennebec River, located ~6 nautical miles from the dredging area. 


  • CASHMAN used a four-point anchoring system instead of spuds to solve the challenges of a current that flowed in excess of 5 knots in the Kennebec River. 
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General Dynamics - Bath Iron Works
$1.5 Million
Nov. 2009- Dec. 2009