Question: Why was the fort viewable from Willard Beach never used? 

full_context: Document 1: Eastern Promenade: The Eastern Promenade (Eastern Prom) is a historic promenade, 68.2 acre public park and recreation area in Portland, Maine. Construction of the Promenade began in 1836 and continued periodically until 1934. The 1.5 mi park was designed by the Olmsted Brothers design firm and experienced its greatest expansion from the 1880s to the 1910s. The Promenade rings around the Munjoy Hill neighborhood and occupies the farthest eastern portion of Portland's peninsula. The Promenade is home to many historical sites, including a mass grave and the mast of the "USS Portland"
Document 2: Willard Beach: Willard Beach is a beach and neighborhood in South Portland, Maine. The beach, which covers 4 acres, used for swimming as well as commercial and recreational boating. Southern Maine Community College abuts the beach. Willard Beach is known for its views of Spring Point Ledge Light as well as island forts including Fort Gorges.
Document 3: Fort Point State Park: Fort Point State Park is a public recreation area with historic features that overlooks Penobscot Bay from the easternmost tip of Cape Jellison in the town of Stockton Springs, Maine. The state park's 156 acre feature the Fort Point Light and the site of historic Fort Pownall. The park offers hiking trails, picnicking, and fishing.
Document 4: Fort Independence (Massachusetts): Fort Independence is a granite bastion fort that provided harbor defenses for Boston, Massachusetts. Located on Castle Island, Fort Independence is one of the oldest continuously fortified sites of English origin in the United States. The first primitive fortification, called "The Castle", was placed on the site in 1634 and, after two re-buildings, replaced circa 1692 with a more substantial structure known as Castle William. Re-built after it was abandoned by the British during the American Revolution, Castle William was renamed Fort Adams and then Fort Independence. The existing granite fort was constructed between 1833 and 1851. Today it is preserved as a state park and fires occasional ceremonial salutes. Fort Independence was added to the National Register of Historic Places in 1970.
Document 5: Fort Levett: Fort Levett was a former U.S. Army fort built on Cushing Island, Maine beginning in 1898. Located in Cumberland County, Maine, in Casco Bay near Portland, Maine, the fort was heavily fortified with guns for coastal defense. Conceived under the Endicott Program in 1885 and begun in the wake of the Spanish–American War, Fort Levett was manned during both World Wars. The fort's name is sometimes mis-spelled as "Fort Leavitt".
Document 6: Coalhouse Fort: Coalhouse Fort is an artillery fort built in the 1860s to guard the lower Thames from seaborne attack. It stands at Coalhouse Point in Essex on the north bank of the river, at a location near East Tilbury that was vulnerable to raiders and invaders. It was the last in a series of fortifications dating back to the 15th century and was the direct successor to a smaller mid-19th century fort built on the same site. Constructed during a period of tension with France, its location on marshy ground caused problems from the start and led to a lengthy construction process. The fort was equipped with a variety of large-calibre artillery guns and the most modern defensive facilities at the time, including shell-proof casemates protected by granite facing and cast-iron shields. However, its lengthy construction and the rapid pace of artillery development at the time meant that it was virtually obsolete for its original purpose within a few years of its completion.
Document 7: South Portland Bus Service: South Portland Bus Service is a municipally-owned suburban provider of mass transportation. Because the city of South Portland opted out of the Greater Portland Transit District, this community runs its own separate three-route bus service. Two routes serve major shopping areas and loop through major residential streets, funneling residents locally and giving them access to downtown Portland. A third route provides access to Willard Beach and Southern Maine Community College, with all three routes going to downtown Portland.
Document 8: Hills Beach: Hills Beach is seaside community in Biddeford, York County, Maine, located approximately 85 mi north of Boston, Massachusetts. Hills Beach is a long stretch of sandy beach on the north side of Biddeford Pool near the mouth of the Saco River and near the Saco Bay. The beach is protected by a breakwater on the north side and the curve of the cove to the south. Access to Hills Beach is at the entrance to the University of New England. Hills Beach is located near Basket Island, Wood Island Light, Stage Island, and others.
Document 9: Sandy Pond Beach Unique Area: Sandy Pond Beach Unique Area is a 76 acre New York State conservation area located within the eastern Lake Ontario dunes. It lies at the north end of a spit of land dividing North Sandy Pond from Lake Ontario, and is about 2 mi north of the developed portion of Sandy Island Beach State Park. There is no road access to the area, which can be most easily reached by boat. For this reason, local residents have long referred to the beach as "Boaters' Beach". It has been managed as part of Sandy Island Beach State Park since 2011.
Document 10: Fort Gorges: Fort Gorges is a former United States military fort built on Hog Island Ledge in Casco Bay, Maine. Built from 1858 to 1864, no battles were fought there and no troops were stationed there. Advancing military technology, including iron clad ships and long range guns, made the fort obsolete before it could be used. The fort is now a park, accessible only by boat. It was added to the National Register of Historic Places in 1973.
Document 11: Fort Knox (Maine): Fort Knox, now Fort Knox State Park or Fort Knox State Historic Site, is located on the western bank of the Penobscot River in the town of Prospect, Maine, about 5 mi from the mouth of the river. Built between 1844 and 1869, it was the first fort in Maine built entirely of granite; most previous forts used wood, earth, and stone. It is named after Major General Henry Knox, the first U.S. Secretary of War and Commander of Artillery during the American Revolutionary War, who at the end of his life lived not far away in Thomaston. The fort was designated a National Historic Landmark in 1970, as a virtually intact example of a mid-19th century granite coastal fortification. Fort Knox also serves as the entry site for the observation tower of the Penobscot Narrows Bridge that opened to the public on 19 May 2007.
Document 12: Fort McClary: Fort McClary is a former defensive fortification of the United States military located along the southern coast of Maine at Kittery Point. Built at the mouth of the Piscataqua River, it was used primarily throughout the 19th century to protect approaches to the harbor of Portsmouth, New Hampshire, and the U.S. naval shipyard.
Document 13: Fort Warren (Massachusetts): Fort Warren is a historic fort on the 28 acre Georges Island at the entrance to Boston Harbor. The fort is pentagonal star fort, made with stone and granite, and was constructed from 1833–1861, completed shortly after the beginning of the American Civil War. Fort Warren defended the harbor in Boston, Massachusetts, from 1861 through the end of World War II, and during the Civil War served as a prison for Confederate officers and government officials. The fort remained active through the Spanish–American War and World War I, and was re-activated during World War II. It was permanently decommissioned in 1947, and is now a tourist site. It was designated a National Historic Landmark in 1970 as a masterpiece of coastal engineering of the pre-Civil War period, and for its role in the Civil War. It was named for Revolutionary war hero Dr. Joseph Warren, who sent Paul Revere on his famous ride, and was later killed at the Battle of Bunker Hill. The name was transferred from the first Fort Warren in 1833, which was renamed Fort Winthrop.
Document 14: Spring Point Ledge Light: Spring Point Ledge Light is a sparkplug lighthouse in South Portland, Maine that marks a dangerous obstruction on the west side of the main shipping channel into Portland Harbor. It is now adjacent to the campus of Southern Maine Community College.
Document 15: Goose Rocks: Goose Rocks Beach (formerly known as "Beachwood"), is a beach neighborhood located in the town of Kennebunkport, Maine United States, bordered by Cape Porpoise, Maine (another neighborhood of Kennebunkport) to the southwest, and Granite Point (a coastal neighborhood of Biddeford, Maine ) to the northeast. The village is inhabited mainly by summer residents from surrounding states and Canadian Provinces. The Little River, which forms a border between Kennebunkport and Biddeford, empties into Goosefare Bay, the body of water that faces Goose Rocks Beach. Goose Rocks is unofficially bounded by the Batsun River to the south-west, Route 9 to the north-west, and the Little River to the north-east. In 2009 Goose Rocks Beach was the subject of a recent lawsuit in which multiple beach-front property owners filed against the town of Kennebunkport, claiming that they owned the beach in front of their homes up to the high tide water line. town. Goose Rocks Beach was the site of the O'Hara Watercolor School run by American watercolor painter Eliot O'Hara from 1930 to 1947. The school and many other buildings burned down in the Great Fires of 1947.
ground_truth: Advancing military technology, including iron clad ships and long range guns, made the fort obsolete before it could be used.