Lobster boats sit amidst the ice at Widgery Wharf in Portland on Feb. 24.

A Coast Guard cutter chops its way through icy waters in Casco Bay on Feb. 13. With smaller boats trapped at their berths, Portland Harbor’s fishing fleet has suffered as a result of the deep freeze.

This photo of the front page of the Feb. 26, 1934 Portland Press Herald shows photos of Casco Bay Lines boat Emita stuck in the ice more than 200 yards from Peaks Island. The boat's passengers walked across the ice to get to the island. The frigid winter of 1934 saw many harbors around Casco Bay frozen solid.

The Astaco Amante backs out of the wharf area to clear chunks of ice between Union and Widgery wharves in Portland on Feb. 24.

A tugboat escorts the cargo ship Anette out of the ice filled river and into open water in this photo taken Feb. 13.

Ice can be seen in Portland Harbor in this 1965 photo taken from the Million Dollar Bridge.

The Lucky Catch is tied among chunks of ice at Union Wharf in Portland on Feb. 24.

The tug Andrew McCallister follows the Anette, a cargo ship that carried clay to South Portland, through a frozen Portland Harbor on Feb. 13.

Workers deal with ice and snow on a boat docked on Portland's waterfront in this December 1955 photo.

Frozen chains and icicles hang from a railing on a boat at Widgery Wharf in Portland on Feb. 24.

Chunks of ice sweep away from the steel hull of the tugboat Andrew McCallister as it travels along the Fore River on Feb. 13. While tugs, ships, ferries and barges are still able to navigate in the ice-clogged harbor waters, smaller fishing vessels have had to stay at the pier. Workers along the Portland waterfront say they haven’t seen the harbor frozen to this extent in more than three decades.

Boats at Widgery Wharf in Portland were trapped in ice and covered with snow in this 1977 photo.

The passage of boats breaks up the ice in Portland Harbor but because the weather has been so cold, it frequently freezes again overnight.

Some boats found open water near Merrill Wharf in Portland in this 1977 photo but the harbor was iced over behind them.

Aboard an ice-encrusted deck on a barge from Saint John, New Brunswick, a deckhand secures a line while docking in South Portland.

A boat is covered with ice in this 1955 photo taken on Portland's waterfront.

Colds temps created ice and locked up boats in Portland Harbor between Long Wharf and Chandlers Wharf in January 2014.

Ice hangs from lines tying boats to a Union Wharf piling in Portland on Feb. 24.