The Grover Cliff geodetic survey station marker was emplaced in 1847, and the military site was renamed Grover's Cliff Military Reservation in 1895. November 1890 planning for the military site was for 3 artillery rifles and 16 mortars, and by spring 1898 Lieutenant Sewail was in charge of construction. A spur of the Boston, Revere Beach and Lynn Railroad was built to the site by 29 March, bids for lumber were received in April, and the "Winthrop Mortar Batteries" of the regular army were ordered to Grovers Cliff in May 1898 for the 16 mortars, with the batteries encamping 16 May on Cherry Street in Boston. Constructed during the Endicott modernization period for fortifications, "the first concrete foundation for one of the disappearing guns at Grovers Cliff" was complete in May 1898, and in 1900 the installation was renamed Fort Heath.
Battery Theodore Winthrop construction was complete by 1901 with three 12-inch M1888 guns on M1896 disappearing carriages, the heaviest guns in the United States ArmyCoast Artillery Corps at the time. "Major Morris of the Seventh Heavy Artillery" was the initial commander, and "Batteries P and O of the Regular Army" manned the guns. Additional land was considered in 1901 for a Fort Heath garrison, and the fort was inspected by the Ordnance Department in 1902. Fort Heath was a secondary station for a 1907 naval exercise, and in 1908 the Massachusetts Volunteer Militia had a Fort Heath unit. In 1908 the fort had a "range-finders house" and a sea wall was considered. In 1917 a "duct line" between Fort Banks and Fort Heath was contracted to New England Telephone and Telegraph, and for 3 batteries—Winthrop and Battery Kellogg & Battery Lincoln at Ft Banks—Ft Heath had the primary base end stations and the Battery Commanders' stations. After the 1925 renaming of the Coast Defenses of Boston to the Harbor Defenses of Boston, the fort's ammunition hoists were authorized for disposal in January 1932. A federal survey marker was set in the roof of the southernmost of the three fire control buildings at the fort in line at the northern end of Battery Winthrop. The marker on the "BC" structure is roughly indicated on the 1921 map. Gun No. 3 of Battery Winthrop was about 120 ft. southeast of this marker, and the line between this gun and Gun No. 1 was 270 ft. in length.
Coast Guard radio station
The United States Coast Guard radio station at Fort Heath opened on 12 November 1931, and was initially used for testing "traffic…relayed from Point Bonita, California." The station had three 50-foot masts in 1934 but as a trial for determining if Navy facilities could instead handle USCG radio traffic, the "station at Winthrop" closed from 1934 to 1936. Subsequently, operating "until 1939 when the site was taken over by the Army", the USCG equipment "relocated to a former intelligence monitoring station at North Truro, Massachusetts."
AA Battery No. 4
Antiaircraft Battery No. 4 was designated in 1935 after the third gun pad was constructed in 1934 for 3-inch AA guns. The first two gun pads were built during World War I. The three emplacements were south of a surveillance radar and west of the "Theo. Winthrop" foundations, and the three guns were approved on 8 January 1942 to be moved to Fort Ruckman.
Anti-Motor Torpedo Boat Battery 945 at the eastern tip of Fort Heath guns, and the HHB 3rd Battalion of the 9th Coast Artillery Regiment was activated at Fort Heath on 1 June 1941. From September–November 1941 the camouflage training school for the First Coast Artillery District was conducted by the Corps of Engineers at Fort Heath. Gun No. 1 was north of the second gun, and Battery 945 was declared surplus on 28 December 1943 nuclear-hardened bunker was the largest structure of the Fort Heath radar station.
The FAA operated the ARSR-1 until the mid-to-late 1990s, and by 2005, the "Fort Heath property" acquired by the town had been converted to a municipal park. The fort land is a Formerly Used Defense Site.
