The U.S. Coast Guard cutter Thunder Bay breaks ice at 12:34 p.m. Thursday on the Kennebec River between Swan Island and Dresden, seen from Dresden riverbank.

The U.S. Coast Guard cutter Thunder Bay breaks ice at 12:32 p.m. Thursday on the Kennebec River between Swan Island and Dresden, seen from Dresden riverbank.

After turning around Thursday just south of the Maine Kennebec Bridge, between Richmond and Dresden, the U.S. Coast Guard cutter Thunder Bay heads back south on the Kennebec River.

The U.S. Coast Guard cutter Thunder Bay breaks ice at 12:09 p.m. Thursday on the Kennebec River between Swan Island and Dresden, seen from Dresden riverbank.

People watch the U.S. Coast Guard cutter Thunder Bay on Thursday under the Maine Kennebec Bridge in Richmond.

People watch the U.S. Coast Guard cutter Thunder Bay on Thursday under the Maine Kennebec Bridge in Richmond.