Constitution Island is located on the east side of the Hudson River directly opposite the U.S. Military Academy Reservation and is connected to the east shore by Constitution Marsh.
It is the only part of the U.S. Military Academy Reservation on the east side of the Hudson River. Formerly known as "Martelaer's Rock", Constitution Island is the site of the earliest Revolutionary War fortifications in the Hudson Valley. Taken briefly by the British in 1777, the island was re-occupied by American forces in 1778, and made an integral part of Fortress West Point. The island was bequeathed to the military academy in 1909 and has been administered by the West Point Museum ever since.