USCG Icebreaking Tug

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USCG icebreaking tug Biscayne Bay (WTGB 104)
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USCG icebreaking tug Biscayne Bay (WTGB 104)

The United States Coast Guard has a class of 140 foot icebreaking tugs, with the pennant numbers WTGB 101 through WTGB 109. They can proceed through fresh water ice up to 20 inches thick. And they can break ice up to three feet thick, through ramming. These vessels are equipped with a system to lubricate their progress through the ice, by bubbling air through the hull.


Displacement 662 tons
Length 42.70 meters (140'0")
Beam 11.40 meters (37'6")
Draught 3.80 meters (12'6")
Speed 15 knots
Compliment 17 (3 officers)

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