The Coast Guard cutter Shackle, one of three 65-foot ice breaking tugs working on the Kennebec River, breaks ice on Thursday as it heads south between Gardiner and Pittston.

The Coast Guard cutter Shackle, one of three 65-foot ice breaking tugs working on the Kennebec River, breaks ice on Thursday as it heads south between Gardiner and Pittston.

The Coast Guard cutter Shackle, one of three 65-foot ice breaking tugs working on the Kennebec River, breaks ice on Thursday as it steams south toward the Maine Kennebec River Bridge between Dresden and Richmond. The old green metal bridge that was replaced by the new taller bridge is being dismantled.

The Coast Guard cutter Shackle, one of three 65-foot ice breaking tugs working on the Kennebec River, breaks ice on Thursday as it steams south toward the Maine Kennebec River Bridge between Dresden and Richmond. The old green metal bridge that was replaced by the new taller bridge is being dismantled.

The Coast Guard cutter Shackle, one of three 65-foot ice breaking tugs working on the Kennebec River, breaks ice on Thursday as it steams south toward the Maine Kennebec River Bridge between Dresden and Richmond.