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WILLIAM S.
Pictured as: the William S. (Bisso Towboat Company) Photo by: Captain Ted

Built in 2012, by Main Iron Works Incorporated of Houma, Louisiana (hull #434) as the William S. for the Bisso Towboat Company Incorporated of Luling, Louisiana.

In 2025, the company was acquired by the Moran Towing Corporation of New Canaan, Connecticut. Where the tug retained her name.

Powered by two, Caterpillar 3516C diesel engines. With two, Ulstein Aquamaster US205 MK2 z-drives. With 90.6(in) diameter by 82.4(in) pitch, four bladed, stainless steel propellers. She is a twin screw tractor tug, rated at 4,000 horsepower.

Her electrical service is provided by two, 99kW Marathon generator sets. Driven by two, John Deere diesel engines. The tug's capacities are 30,163 gallons of diesel fuel, 1,826 gallons of lube and hydraulic oil, and 10,938 gallons of potable water.

Her deck equipment consists of a Market DYSF42, hydraulic winch mounted on the bow outfitted with 500(ft) of 8(in) Saturn 12 line.


  • Vessel Name: WILLIAM S.
  • USCG Doc. No.: 1239737.
  • Vessel Service: TOWING VESSEL
  • Trade Indicator: Coastwise Unrestricted, Registry
  • Call Sign: WDG4522
  • Hull Material: STEEL
  • Hull Number: 434
  • Ship Builder: MAIN IRON WORKS LLC
  • Year Built: 2012
  • Length: 96
  • Hailing Port: NEW ORLEANS, LA.
  • Hull Depth: 16.5
  • Hull Breadth: 38
  • Gross Tonnage: 195
  • Net Tonnage: 38
  • Previous Vessel Names:
    WILLIAM S.
  • Previous Vessel Owners:
    BISSO TOWBOAT CO. INC.