Funny thing about Deer Island: it’s not actually an island. A hurricane in 1938 created the causeway that now connects the ‘island’ to the mainland, so the Harbor Express boats do not go here (it’s accessible only by car). The other funny thing about Deer Island is that it is dominated by a gigantic sewage treatment plant, which is one of the key factors in the clean-up of Boston Harbor. The facility is surrounded by 60 acres of parkland, with 5 miles of trails. Tours of the waste water treatment facility are also available, with advance arrangements.
