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| Fort Foster | |
|---|---|
| Name | Fort Foster |
| Location | Kittery, Maine, United States |
| Coordinates | 43.0847°N 70.7374°W |
| Type | Coastal fortification |
| Built | 1862–1898 |
| Builder | United States Army Corps of Engineers |
| Materials | Earthworks, timber, masonry, concrete |
| Condition | Preserved ruins and reconstructed elements |
| Ownership | Maine Department of Conservation; managed by Kittery, Maine |
| Controlledby | United States |
| Battles | American Civil War, Spanish–American War (coastal defense readiness) |
Fort Foster is a 19th‑century coastal fortification located in Kittery, Maine guarding the mouth of the Piscataqua River and the approaches to Portsmouth, New Hampshire and Newcastle, Maine. Initially constructed during the American Civil War and upgraded during the Endicott Period of coastal defenses, the site reflects changing technologies overseen by the United States Army Corps of Engineers, the United States Army Coast Artillery Corps, and regional authorities. The fort’s surviving earthworks, magazines, and later concrete batteries are preserved as a municipal park and as a focus for archaeological and historical research.
Construction began in 1862 in response to Confederate commerce raiders and concerns after the First Battle of Bull Run increased anxiety on the Atlantic seaboard; local leaders in Kittery, Maine and officials from Portsmouth Navy Yard advocated for improved defenses. The initial phase paralleled works at Fort Constitution and Fort McClary as part of a regional program guided by the United States Army Corps of Engineers. After the American Civil War, funding lapses left many works incomplete until renewed interest in the 1880s. The 1890s brought the Endicott Board recommendations, influenced by Secretary of War William Crowninshield Endicott, spurring upgrades across the coast including the addition of breech‑loading rifle batteries similar to those recommended for Fort Dearborn and other New England sites. During the Spanish–American War mobilization, Fort Foster’s batteries were readied though the fort saw no major combat; post‑war reorganizations transferred responsibilities to the United States Army Coast Artillery Corps, which maintained intermittent garrisoning into the early 20th century. Decommissioning followed advances in naval armament and the consolidation of harbor defenses around Portsmouth Naval Shipyard, and control later passed to Maine Department of Conservation and local authorities who established public access.
Designed as an enclosed work with seaward‑facing batteries, the fort’s earliest phase used timber revetments, packed earth, and bombproof magazines—construction techniques common to works overseen by the United States Army Corps of Engineers during the Civil War. The later Endicott upgrades introduced reinforced concrete emplacements, disappearing carriages, and reinforced magazines aligned with recommendations from the Endicott Board and influenced by contemporary battery designs at Fort Monroe and Fort Adams. Emplacement layouts balanced overlapping fields of fire to control channels used by merchant and naval vessels approaching Portsmouth Harbor, with powder rooms and shell storage arranged to minimize the risk of sympathetic detonation—a principle codified in manuals from the United States Army Ordnance Department. Landscape engineering integrated glacis and sally ports to permit infantry support from nearby earthwork parapets.
Fort Foster functioned primarily as a deterrent and as an active component of harbor defense networks that included Fort Constitution, Fort Stark, and batteries at Baker Island National Wildlife Refuge (historically armed). During the American Civil War and the Spanish–American War periods the fort conducted drills, gunnery practice, and coordination with the United States Navy's local elements at the Portsmouth Naval Shipyard. Though the site did not engage in recorded combat actions, it participated in mobilization exercises, target practice, and emergency preparedness under directives from the United States Army Coast Artillery Corps and regional defense coordinators. In World War I and World War II, shifting strategic emphasis and the advent of long‑range naval guns and aircraft relegated many Endicott batteries to secondary roles; Fort Foster’s guns were eventually removed or scrapped in accordance with national recalibration of coastal defenses supervised by the War Department.
After military abandonment, the fort’s land underwent phases of private ownership, municipal acquisition, and conservation. Local preservationists and historians from organizations such as the Kittery Historical and Naval Museum and state archaeologists with the Maine Historic Preservation Commission documented remaining earthworks, magazines, and masonry. Archaeological surveys have recovered ordnance fragments, shell timbers, and artifacts linked to garrison life; these finds have been cataloged following standards from the Society for American Archaeology and reported in regional journals. Stabilization efforts employed techniques endorsed by the National Park Service's standards for historic preservation, including controlled reconstruction of select parapets and interpretive signage developed in collaboration with the Maine Historical Society.
Perched on Gerrish Island and adjacent promontories overlooking the Piscataqua River estuary, the fort occupies coastal terrain characterized by glacial till, rocky ledges, and saltmarshes common to Maine’s southern shore. Tidal action from the Gulf of Maine influences erosion patterns that threaten exposed earthworks, prompting shoreline management plans drawn with input from Maine Department of Environmental Protection and regional marine biologists from the University of New Hampshire. Local flora and fauna include salt‑tolerant grasses, gull nesting sites, and migratory bird corridors noted by the Audubon Society's regional chapters; habitat conservation is balanced with public access and historical interpretation.
The site is open to the public as Fort Foster Park under local management; facilities include walking trails, interpretive panels, picnic areas, and parking managed by Kittery, Maine. Guided tours, seasonal events, and volunteer‑led programs are offered by the Kittery Historical and Naval Museum and local historical societies; visitors are advised to consult town notices for hours, special events, and accessibility. Nearby points of interest include Portsmouth, New Hampshire's waterfront, the Portsmouth Naval Shipyard, and other regional forts such as Fort McClary and Fort Constitution for comparative study.
Category:Forts in Maine