Deer Island is a peninsula in Boston Harbor, Massachusetts. Since 1996 it is part of the Boston Harbor Islands National Recreation Area. Although still an island by name, Deer Island has been connected to the mainland since the former Shirley Gut channel, which once separated the island from the town of Winthrop, was filled in by the New England Hurricane of 1938. Today Deer Island is best known as the location of the Deer Island Waste Water Treatment Plant, whose 150-foot-tall (46 m) egg-like sludge digesters are major harbor landmarks.
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