Moon Island is situated in Quincy Bay, in the middle of Boston Harbor, Massachusetts, and is the location of the Boston Fire Department Training Academy, and Boston Police Department shooting range. All of the land on the island is owned by the City of Boston but the island is under the jurisdiction of Quincy, Massachusetts. It is also part of the Boston Harbor Islands National Recreation Area.
The causeway to Moon Island did not exist before the late 1870s and there was no bridge across Western Way to Long Island until the construction of the Long Island Viaduct in 1951. This bridge was closed October 8, 2014. The sand spit from Thompson Island to Squaw Rock on Squantum was a clam bar until the sewage outflow from Moon Island backed up into the local waters. Native Americans summered in this area for thousands of years and consumed the prevalent mollusks.
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