Icebreaking 
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Photos of icebreaking operations on the Great Lakes
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Mackinaw (1.80 MB)
WHITEFISH BAY, Mich. (Mar. 14, 2007) -- The cutter Mackinaw (WLBB-30) conducted ice trials in 24-inch thick ice along the St. Marys and Neebish Rivers to Whitefish Bay March 14 after a period of three weeks testing the ship's capabilities. -
Mackinaw at the Soo Locks (1.58 MB)
SAULT STE. MARIE, Mich. (Mar. 14, 2007) Crewmembers aboard the Mackinaw (WLBB-30) observed the capability of the ship's Azipod to flush ice away from the pier at the Soo Locks before mooring here March 14 after concluding a third week of ice trials from Green Bay, Wis. to Sault Ste. Marie, Mich.