The Duluth-based U.S. Coast Guard Cutter Alder will be in use locally Friday in the Superior Bay, where it will assist a tug-barge in moving from one berth to another.

The tug-barge will move from Fraser Shipyards in Superior to the Midwest Energy Resources Co. terminal.

The Alder will sail from its dock in Duluth to assist the unspecified tug-barge, a Coast Guard news release said Thursday.

The Coast Guard described the leftward-turning route as a track through the ice as starting at Fraser in Howards Bay, "through East Gate Basin, then proceeding east down the Superior Front Channel to the Superior Midwest Energy Terminal."

Alder will be monitoring VHF Channel 16 throughout the icebreaking evolution, the Coast Guard said, before warning users of the shipping channels to be aware.

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All snowmobile, all-terrain-vehicle operators, and other recreational users of the ice were being asked to avoid associated shipping channels outside Superior, and to plan their activity carefully near the ice.

"Ice fishermen, especially, should use caution when placing their ice shacks in proximity to these shipping channels," the Coast Guard said.