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O.J. CENAC (2002)
Pictured as: the Cooper Mountain (Harley Marine) Photo by: Steven Collingwood

Built in 2002, by Main Iron Works Incorporated of Houma, Louisiana (hull #413) as the O.J. Cenac for the Cenac Towing Company of Houma, Louisiana.

In 2008, the tug was acquired by Teppco Marine Services of Houma, Louisiana. Where she retained her name.

In 2009, she was acquired by Enterprise Marine Services of San Antonio, Texas. Where the tug was renamed as the O.J.

In 2015, the tug was acquired by Harley Marine Services Incorporated of Seattle, Washington. Where she was renamed as the Cooper Mountain.

Powered by three, Cummins QSK60 diesel engines. With Twin Disc MG 5321 DC reduction gears, at a ratio of 7:1. Turning three, 74(in) by 60(in), four bladed, fixed pitch, propellers. She is a triple screw tug, rated at 6,000 horsepower.

Her electrical service is provided by two, Tier III compliant, 132kW Cummins BTA5 generator sets. The tug's capacities are 102,400 gallons of fuel, 1,465 gallons of lube oil, and 20,500 gallons of water.

The towing equipment consists of an air over hydraulic, single drum, towing winch.


  • Vessel Name: O.J. CENAC (2002)
  • USCG Doc. No.: 1136328
  • Vessel Service: TOWING VESSEL
  • IMO Number: 8976607
  • Trade Indicator: Coastwise Unrestricted, Registry
  • Call Sign: WDF2428
  • Hull Material: STEEL
  • Hull Number: 413
  • Ship Builder: MAIN IRON WORKS, INC
  • Year Built: 2002
  • Length: 115.8
  • Hailing Port: ST LOUIS, MO.
  • Hull Depth: 14
  • Hull Breadth: 38
  • Gross Tonnage: 183
  • Net Tonnage: 128
  • Owner:
    OCEAN APEX T & B LLC
    8235 FORSYTH BLVD STE 400
    SAINT LOUIS, MO 63105
  • Previous Vessel Names:
    O J CENAC, O J CENAC, O J
  • Previous Vessel Owners:
    CENAC TOWING CO INC, TEPPCO MARINE SERVICES LLC, ENTERPRISE MARINE SERVICES LLC, ENTERPRISE MARINE SERVICES LLC