USS Niagara, commonly called the U.S. Brig Niagara or the Flagship Niagara, is a wooden-hulled snow-brig that served as the relief flagship for Oliver Hazard Perry in the Battle of Lake Erie during the War of 1812. As the ship is certified for sail training by the United States Coast Guard, she is also designated SSV Niagara. Niagara is usually docked behind the Erie Maritime Museum in downtown Erie in the U.S. state of Pennsylvania as an outdoor exhibit for the museum. She also often travels the Great Lakes during the summer, serving as an ambassador of Pennsylvania when not docked. It was listed on the National Register of Historic Places in 1973 and was designated the official state ship of Pennsylvania by the Pennsylvania General Assembly in 1988.

Niagara was constructed from 1812 to 1813 to protect the vulnerable American coastline on Lake Erie from the British and played a pivotal role in the battle for the lake. Along with most warships that served in the war, Niagara was sunk for preservation on Presque Isle in 1820. Raised in 1913, it was rebuilt for the centennial of the Battle of Lake Erie. After deteriorating, the restoration of Niagara was started again in the 1930s, but was hampered by the lack of funds caused by the Great Depression and remained uncompleted until 1963. A more extensive restoration was carried out in 1988 in which much of the original ship was largely destroyed. The incorporation of new materials and modern equipment makes it ambiguous as to whether it is or is not a replica.

Naming In 1907, President Theodore Roosevelt issued an executive order standardizing the prefix of all vessels of the United States Navy to be "USS". Prior to this, ship prefixes were used "haphazardly", but ships' names were often preceded by the abbreviation "US" and the type of vessel. A survey of documents contained in the National Archives and Records Administration that were sent to and from the Department of the Navy in that era found a number of inconsistencies. Of 55 correspondences that mentioned Niagara, 43.6 percent used the term "US Sloop Niagara", 32.7 percent used "US Brig Niagara" and 23.6 percent had "USS Niagara".

Because of its historical role as the flagship of Oliver Hazard Perry during the Battle of Lake Erie, the ship is commonly referred to as the Flagship Niagara. Niagara also carries the name of "SSV Niagara" due to its designation by the United States Coast Guard as a Sailing School Vessel.

Construction In the beginning of September 1812, Daniel Dobbins, a merchant on the Great Lakes, arrived in Washington, D.C., to warn the United States government of the vulnerability of the Lake Erie coastline to a British attack. Dobbins had been captured by the British after a surprise attack at Fort Mackinac in Michigan, but was able to negotiate his release. Dobbins was briefly detained again by the British in Detroit after the city was captured. After several days of discussions with President James Madison and Secretary of the Navy Paul Hamilton, Dobbins convinced them that the safest place to build a fleet was in the sheltered bay formed by Presque Isle at Erie, Pennsylvania. On 15 September, Hamilton authorized Dobbins to construct four gunboats. Hamilton also granted $2,000 to be used for the construction and appointed Dobbins, a civilian, to the rank of sailing master in the United States Navy. On 31 December, Captain Isaac Chauncey, the commander of naval forces on Lake Ontario, arrived in Erie for a day, made some alterations to Dobbins' ship design and authorized him to build, additionally, two brigs. Oliver Hazard Perry was named chief naval officer in February 1813 and was given orders to report to Erie from Newport, Rhode Island. Perry arrived in Erie on 26 March, after being held up in Sackets Harbor, New York for two weeks by Chauncey in case of a possible attack by the British.

The construction of the fleet was largely supervised by Noah Brown, a shipwright brought in from New York City. The keels of two brigs were each constructed out of a single black oak log. Due to a lack of iron, the timbers that made up the hulls were joined using wooden pins called treenails. In place of the oakum and pitch normally used to caulk ships, lead was used. The timbers used in the brigs were still green, as the builders did not have the luxury of time to allow the wood to dry properly. A total of 65 cannons were shipped to Erie to arm the fleet; Hamilton approved the production of 37 cannons by a foundry in Washington, D.C., and the rest were moved from Sackets Harbor. and were launched in April 1813, in May, and the brig on 25 June. Niagara was launched on 4 July along with .

One of the strategic advantages of building a fleet in Erie was that the bay formed by Presque Isle was cut off from the Lake Erie by a sandbar, which prevented British warships from being able to enter the bay. The brigs Niagara and Lawrence both had a draft of , which was too deep to cross the sandbar. On 4 August, Niagara was pulled onto the sandbar using its anchor in a technique called kedging and was lightened by removing its cannons and ballast. A pair of barges, called "camels", were placed on either side of the ship. The camels were sunk and secured to Niagara. The water was pumped out of the camel, lifting the ship. By the following day, Niagara was safely over the sandbar and was rearmed; Lawrence was floated over the sandbar a couple of days before Niagara. During the construction, the area was usually under daily surveillance by the British. On the day Lawrence crossed the sandbar, a pair of British warships, and , observed for an hour but failed to notice Perry's actions.

War of 1812

On 6 August, Perry ordered a shakedown cruise of his squadron, now totaling ten after the inclusion of three merchant vessels—, and —that were converted into warships and , which was captured from the British. Lieutenant Daniel Turner was placed in command of Niagara for the cruise, as the squadron was still seriously undermanned; Dobbins had even written a letter, directed to Secretary Hamilton, out of desperation back in December 1812. Word arrived on 8 August that Jesse Elliott was en route to Erie from Black Rock, New York with 89 men. Elliott was promoted to Master Commandant in July, and was given command of Niagara after arriving in Erie on 10 August.

On 17 August, Perry's squadron anchored off of Sandusky, Ohio, and dispatched a boat to inform General William Henry Harrison of their presence. Harrison and his staff met with Perry aboard the ships the next day and agreed to a rendezvous in Put-in-Bay. In Put-in-Bay, Harrison made available 100 "Kentucky and frontier riflemen" to serve on board as Marines. A British squadron, under the command of Commodore Robert Heriot Barclay, was based at Fort Amherstburg, Canada. While Perry's squadron was under construction, Barclay had ordered the construction of , which was to be a match for Niagara and Lawrence. Unbeknownst to Perry, supplies in Fort Amherstburg were running out, as his squadron had cut off shipments from Long Point. Fearing an uprising caused by a shortage of food, Barclay and his squadron set sail as soon as Detroit was complete.

Battle of Lake Erie

On 10 September, both squadrons got underway. Detroit fired the first shot around noon, while still out of range. Perry formed his ships into a line of battle, with the larger ships each being assigned a target: Lawrence to Detroit, Niagara to Queen Charlotte, and Caledonia to . As the line moved to engage, Niagara, under the command of Elliott, lagged behind the rest of the American squadron. The cause of the failure of Niagara to maintain formation is unknown, either deliberate on the part of Elliott, or because it was becalmed. After a couple of hours, all of the cannons on Lawrence that were facing the British were out of commission and the brig could no longer be maneuvered. Perry lowered his battle flag, emblazoned with the last words of Captain James Lawrence, "DONT GIVE UP THE SHIP" and transferred to the still-intact Niagara via a dinghy. Perry took command of Niagara and crossed the British line perpendicularly in a tactic called crossing the "T". Queen Charlotte, while attempting to prevent Niagara from breaking through the line, collided with Detroit and became entangled. Niagara opened fire with both broadsides: the starboard broadside hitting Queen Charlotte and Detroit, and the port into Lady Prevost. After several broadsides, Queen Charlotte struck her colours, followed shortly after by Detroit and the rest of Barclay's squadron.

Following the battle, Niagara assisted in the transporting of Harrison's army to the mouth of the Detroit River in preparation for an invasion of southwest Ontario. On 25 April 1814, command of Niagara was transferred to Arthur Sinclair. After repairs, the squadron—consisting of Niagara, Lawrence, Caledonia, Scorpion and Tigress—departed Erie for Detroit. In Detroit, soldiers under the command of Colonel George Croghan embarked with the squadron, bound for Mackinac Island. The squadron arrived on 26 July and landed on 4 August. The battle was ultimately lost, with Croghan being forced to retreat back to his boats. On 13 August, the squadron arrived at the mouth of the Nottawasaga River where they attacked a blockhouse owned by the North West Company (NWC). The NWC blockhouse was destroyed by the British, along with the schooner HMS Nancy, to prevent the supplies they contained from being captured.

After the Treaty of Ghent was signed, ending the war, the majority of the surviving ships that participated in the Battle of Lake Erie were disposed of in 1815. Queen Charlotte, Detroit, and Lawrence were sunk for preservation in Misery Bay on Presque Isle, whereas Niagara was kept afloat and operated as a receiving ship. It was sunk in 1820 when the naval station at Presque Isle was closed. Benjamin H. Brown of Rochester, New York bought all four ships in 1825, but sold them in 1836 to George Miles of Erie. Miles raised the ships, planning on using them as merchant vessels. Lawrence and Niagara, not having a large enough hold and being in poor condition, were allowed to sink again.

Centennial

As part of celebrations for the centennial of the Battle of Lake Erie, Niagara was raised from Misery Bay in April 1913. Its keel was found to be in good enough condition for the brig to be rebuilt. Efforts to rebuild Niagara were hampered by the lack of original plans. The restored Niagara was launched on 7 June, complete with a new bowsprit, rigging and reproduction cannons supplied by the Boston Navy Yard. From mid-July to mid-September, Niagara was towed to various ports on the Great Lakes—including Milwaukee, Chicago, Detroit, Buffalo and Cleveland—by USS Wolverine, the Navy's first iron-hulled warship. Ownership of Niagara was transferred to the City of Erie in 1917, where it remained docked and deteriorating.