Fort O'Brien

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Fort O'Brien
MachiasportME FortOBrienView.jpg
View of fort remains: Revolutionary War on the left, Civil War on the right
Fort O'Brien is located in Maine
Fort O'Brien
Nearest city Machiasport, Maine
Coordinates 44°41′22″N 67°23′48″W / 44.68944°N 67.39667°W / 44.68944; -67.39667Coordinates: 44°41′22″N 67°23′48″W / 44.68944°N 67.39667°W / 44.68944; -67.39667
Area 0 acres (0 ha)
Built 1775
Governing body State
NRHP Reference #


Added to NRHP October 01, 1969

Fort O'Brien State Historic Site, also known as Fort Machias, preserves the remains of a fort located in Machiasport, Maine that was built and destroyed three times over a 90-year period.

The Civil War batteries

The first fort was built in 1775 to guard the Machias River and its communities, and destroyed by the British during the American Revolutionary War in the same year. The fort was rebuilt in 1777, and then destroyed by the British in 1814 during the War of 1812. Gun batteries were installed at the site in 1863, during the American Civil War.[2] The cannon "Napoleon" still exists on site.

The site is open from Memorial Day through Labor Day.


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