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Fort Baldwin
Part of Coast Defenses of the Kennebec
Phippsburg, Maine
Type Fortification
Site information
Owner Public - State of Maine
Open to
the public
Fort Baldwin Historic Site
Fort Baldwin is located in Maine
Fort Baldwin
Location in Maine
Fort Baldwin is located in the United States
Fort Baldwin
Location in the United States
Location Sabino Hill, Phippsburg, Maine
Area 6 acres (2.4 ha)
Built 1905 (1905)
Architect United States Army Corps of Engineers
NRHP reference No. 79000166
Added to NRHP August 3, 1979
Site history
Built 1905–1912
Built by U.S. Army Corps of Engineers
In use 1912–1924, 1941–1945
Materials Reinforced concrete, earth
Garrison information

Fort Baldwin is a former coastal defense fortification near the mouth of the Kennebec River in Phippsburg, Maine, United States, preserved as the Fort Baldwin State Historic Site. It was named after Jeduthan Baldwin, an engineer for the Continental Army during the American Revolution. The fort was constructed between 1905 and 1912 and originally consisted of three batteries. The site was listed on the National Register of Historic Places in 1979.

Artillery Batteries

  • Battery Cogan with two 3-inch M1903 guns on pedestal mounts. Named in honor of a lieutenant in the 5th Continental Regiment during the American Revolution. Cogan, who had also been quartermaster of the 1st New Hampshire Regiment, died August 21, 1778.
  • Battery Joseph Roswell Hawley with two 6-inch M1900 guns on pedestal mounts. This battery also housed the fort's original observation station and electric equipment. Named in honor of Brigadier General Joseph R. Hawley who served with distinction during the American Civil War.
  • Battery Hardman with one 6-inch gun M1905 on a disappearing carriage. Named in honor of a Captain in the 2nd Maryland Regiment, Continental Army during the American Revolution. Hardman was taken prisoner at Camden, South Carolina and died while a prisoner of war on September 1, 1780.


Additionally, facilities for a controlled minefield in the river were built at nearby Fort Popham. The fort was in caretaker status prior to the American entry into World War I, and at some point was probably under the Coast Defenses of the Kennebec command. During World War I, Fort Baldwin and Fort Popham had a garrison of 200 soldiers from the 13th and 29th Coast Artillery companies of the Coast Defenses of Portland. All three 6-inch guns were withdrawn in 1917 as part of a program to put these weapons on field carriages and use them on the Western Front. Battery Hawley's guns were not sent overseas and were remounted in 1919. Battery Hardman's gun was sent to France; apparently it was eventually returned to the US but not to Fort Baldwin. A history of the Coast Artillery in World War I states that none of the regiments in France equipped with 6-inch guns completed training in time to see action before the Armistice.

In 1924, Fort Baldwin was disarmed as part of a general drawdown of less-threatened coast defenses and sold to the State of Maine. Early in World War II, four circular concrete "Panama mounts" were constructed at Fort Baldwin, two of them on Battery Hawley's 6-inch gun positions. These were to provide improved firing platforms for towed 155 mm M1918 guns that were adopted by the Coast Artillery following World War I. From 1941 to 1943, Battery D, 8th Coast Artillery protected Fort Baldwin and its Fire Control Tower that could radio the precise position of enemy vessels to batteries in Casco Bay, notably Battery Steele with its 16-inch guns. A battery of four 155 mm guns, most likely from Fort Williams, was deployed to Fort Baldwin from early 1942 to 17 January 1944. After the war, the Army returned the property to the State of Maine in 1949.

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