Coast Guard, unified command finalize raising of sunken tug

SAN FRANCISCO – The U.S. Coast Guard, California Department of Fish and Game’s Office of Spill Prevention and Response, and other partner organizations have finalized contractual plans to surface the sunken tug Wenonah at Treasure Island.

Global Diving and Salvage has subcontracted American Bridge-Flour Joint Venture’s barge crane, the Left Coast Lifter, to assist in the rising and disposal of the 300-ton tug, Wenonah. Operations are scheduled to commence within the next few days.

SURFACING PROCESS:

  • Preventative measures taken to ensure integrity of containment boom and increase absorbent materials around tug.
  • Two access channels dug under the hull of the tug, fore and aft of the vessel.
  • Two 90-foot segments of chain capable of lifting 450 tons will be positioned under the tug and winched together above the vessel by a crane.
  • Left Coast Lifter will raise the tug to the waterline.
  • Coast Guard Pacific Strike Team members will board the tug and commence de-watering, compartment-by-compartment.

The Treasure Island Development Authority, a resource trustee, will oversee the disposal of the tug. The unified command will oversee cleanup of any further oil discharge that may occur during the surfacing of the tug.

The Left Coast Lifter is a 400-foot long shear leg crane used in the construction of the new East Span of the San Francisco – Oakland Bay Bridge. The crane can lift up to 1,873 tons.

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