SPRINGFIELD, Mass. (AP) – When Kenneth Crimmins moved here from Vermont years ago, he thought he was settling on the edge of a small patch of woods. He didn’t know he had waterfront property and that those woods were actually a rare floating island that had docked in his back yard.

This month, the 10,000 square-foot island settled on a different shore. On Saturday, Crimmins watched as workers once again hauled it to the middle of the lake. It took eight men using two cables capable of pulling 45 tons three hours to “re-float” the island.

The island, though an interesting oddity, is a bit of an eyesore and has a funny smell, Crimmins said. With no island in his back yard, he has a better view and fewer mosquitos, he said.

William Lodi has lived on the pond for about 20 years and said he’s seen the island get stuck a dozen or so times. “It doesn’t bother anybody in the middle – they like to see it go back and forth,” Lodi said.

Experts say the floating island is one of few in the country and perhaps dates back centuries. Scientists suggest that the island’s base is made up of a webbing of tree roots and other organic material. Methane gas is believed to contribute to its ability to float. The trees on it act as sails and routinely send it on a slow careen around the pond.

Every few years, according to neighbors, it crashes into someone’s back yard, sometimes with enough force to take out a tree or fence.

“It’s been all over,” said Philip Cote, who has lived in the neighborhood for 44 years.

C.J. Morel, of CJ’s Towing in Springfield, said his crew hooked straps around four of the island’s biggest trees and attached them to cables. Then a truck on the opposite end of the pond pulled until the island came free.

A worker stationed on the island whooped when he felt the island move underneath him, sailing back to the center of the 10-acre pond.

The pond and island are owned by Cathedral High School, which is paying about $5,000 for it to be towed. That money, principal John Miller said, is coming out of the school’s operating budget. The school is funded by the Springfield Diocese.