Bay-class tugboat

The Bay-class tugboat is a class of 140 ft icebreaking tugboats of the United States Coast Guard, with hull numbers WTGB-101 through to WTGB-109.

They can proceed through fresh water ice up to 20 in thick, and break ice up to 3 ft thick, through ramming. These vessels are equipped with a system to lubricate their progress through the ice, by bubbling air through the hull.

Service Life Extension Program
The WTGB SLEP project includes significant system upgrades and improvements to the propulsion plant; heating, ventilation, and air conditioning systems; installation of an engine-room fire-suppression system; boat launching davit replacement; Oily Water Separator replacement; stack exhaust configuration modifications; hull air-ice lubrication system; and crew habitability improvements to meet current standards (including removal of lead paint). The first WTGB SLEP is scheduled for 12 months; however, once the Yard achieves a satisfactory production labor learning curve (anticipated after Hull #3), the Yard will complete two 140-foot WTGB SLEPs per year, with an anticipated duration of 9 months each. The first of nine cutters (Morro Bay) entered production at the Coast Guard Yard on July 1, 2014. Morro Bay returned to her homeport of Cleveland in September 2015



Ships

 * (WTGB-101) Katmai Bay (Homeport - Sault Ste. Marie, MI)
 * (WTGB-102) Bristol Bay (Homeport - Detroit, MI)
 * (WTGB-103) Mobile Bay (Homeport - Sturgeon Bay, WI)
 * (WTGB-104) Biscayne Bay (Homeport - St. Ignace, MI)
 * (WTGB-105) Neah Bay (Homeport - Cleveland, OH)
 * (WTGB-106) Morro Bay (Homeport - Cleveland, OH)
 * (WTGB-107) Penobscot Bay (Homeport - Bayonne, NJ)
 * (WTGB-108) Thunder Bay (Homeport - Rockland, ME)
 * (WTGB-109) Sturgeon Bay (Homeport - Bayonne, NJ)
 * (WTGB-110) Curtis Bay (Construction cancelled)