 The dedication plaque at the outbound entry to this bridge at Squantum, says it was built in 1950-51 by the Institutions Department of the City of Boston, and calls it the "Long Island Viaduct".Moon Island is connected to the mainland Squantum peninsula of North Quincy by a causeway.Long Island is currently used to support social service programs, as it has since 1882, contained in Boston Public Health Commission Long Island Health Campus facilities in 19 buildings on .