See main article: Bay-class tugboat. The 140feet Bay-class tugboats are operated primarily for domestic ice breaking duties. They are named after American bays and are stationed mainly in the northeast United States and the Great Lakes.
WTGBs use a low pressure air hull lubrication or bubbler system that forces air and water between the hull and ice. This system improves icebreaking capabilities by reducing resistance against the hull, reducing horsepower requirements.
Morro Bay was laid down by the Tacoma Boatbuilding Co., in Tacoma, Washington on 6 August 1979. She was launched on 11 July 1980 and later commissioned at the Reserve Training Center in Yorktown, Virginia, on 28 March 1981. She served at Yorktown until 1998 and then at New London, Connecticut, before she was reassigned to Cleveland, Ohio in the summer of 2014.
On 2 July 2008, Morro Bay was returning to New London when she collided with a Block Island ferry.[3]
In May 2018, Morro Bay arrived at the Great Lakes Shipyard for repairs and maintenance.[4]
On 13 June 2021, while the museum ship was being towed out of Cleveland for repairs, Morro Bay collided with Cod at 11:30 a.m., though damage to the vessels was minor.[5]