Deer Island is a peninsula in Boston, Massachusetts, United States. Since 1996, it has been part of the Boston Harbor Islands National and State Park. 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, Massachusetts, was filled in by …Deer Island is a peninsula in Boston, Massachusetts, United States. Since 1996, it has been part of the Boston Harbor Islands National and State Park. 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, Massachusetts, was filled in by the 1938 New England hurricane. Today, Deer Island is the location of the Deer Island Wastewater Treatment Plant, whose 150-foot-tall egg-like sludge digesters are major harbor landmarks.
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