Mystic — Mystic Seaport has raised the $850,000 needed to fully fund the restoration of the Sabino, one of the country's last remaining operating coal-fired steamships.

The ship, which last operated in 2014, is scheduled to resume its trips on the Mystic River next summer. It is one of four ships designated as National Historic Landmarks in the museum’s collection.

“We are really excited about getting her back in operation next summer,” Seaport spokesman Dan McFadden said.

He said the Coast Guard has approved the design for a new boiler, which will be fabricated and installed early next year.

McFadden said a total of 144 individuals contributed to the project. The museum also received state and federal grants totaling $520,000 for the work.

“We are proud to announce that through your tremendous efforts and generosity the Sabino restoration campaign is now fully funded. All of your generous support has allowed Mystic Seaport the ability to completely restore and refit this beloved National Historic Landmark,” Christopher Freeman, the museum’s director of development, and Amanda Keenan, its advancement associate, wrote to contributors.

Much of the restoration work on the ship had been completed earlier this year, when it was determined the boiler needed to be replaced. The museum said at the time that the need to obtain additional private funding and find a manufacturer to build the boiler made it impossible to finish the work in time for this year’s operating season.

A call then went out for donations to replace the boiler, which was built in the 1940s. That boiler is on display in the new Thompson Exhibit Building.

“It is a technical and sculptural artifact that allows visitors to take an up-close look at the marvelously complicated inner workings of steam power,” Freeman and Keenan wrote to the contributors.

The Sabino will be powered by its original engine built in 1908 in Noank.

A recommissioning ceremony is being planned for the ship next year.

j.wojtas@theday.com