Bridge Island Meadows is an 80-acre (320,000 m2) nature reserve owned by The Trustees of Reservations on the floodplains of the upper Charles River in Millis, Massachusetts.[1][2] The property was a 1974 gift from Dr. and Mrs. John D. Constable to the Trustees of Reservations.[2] The property is surrounded by wetlands, and is only accessible by boat.