The USS Tonawanda was a Miantonomoh-class monitor built for the United States Navy during the American Civil War era. Constructed at the Philadelphia Navy Yard, she was laid down in 1863 and launched on May 6, 1864. The vessel was commissioned on October 12, 1865, under the command of Commander William Ronckendorff. With a length overall of 259 feet 6 inches (79.1 meters), a beam of 52 feet 10 inches (16.1 meters), and a draft of 13 feet 5 inches (4.1 meters), Tonawanda displaced approximately 3,400 long tons (3,500 tonnes) and had a tonnage of 1,564 tons burthen. Her hull featured five layers of 1-inch wrought iron plates, tapering to 3 inches at the bottom, backed by 12–14 inches of wood, providing significant protection. The ship's main armament comprised four 15-inch (381 mm) Dahlgren smoothbore muzzle-loading guns mounted in two twin turrets positioned fore and aft of the funnel, capable of firing 350-pound shells up to 2,100 yards. Power was supplied by four inclined horizontal-return connecting-rod steam engines, rated at 1,400 indicated horsepower, driving two propellers. Steam was generated by four Martin vertical water-tube boilers, enabling a top speed of approximately 9–10 knots. The vessel carried 300 long tons of coal for her engines. Her deck armor was 1.5 inches thick, with turret armor consisting of ten layers of 1-inch plates, and the pilot house protected by eight layers. Although completed too late for Civil War service, USS Tonawanda served briefly as a training ship at the United States Naval Academy after her commissioning. She was decommissioned in December 1865, reactivated in October 1866, and renamed Amphitrite in June 1869. Her service ended in 1872, and she was sold for scrap in 1873 to Harlan and Hollingsworth Co. of Wilmington, Delaware. The Navy Department later claimed that the ship was being repaired when Congress refused to fund new ships, leading to the construction of a new iron-hulled monitor of the same name with the proceeds of her sale, highlighting her role in the transitional period of naval design and her maritime significance as part of the post-Civil War naval fleet.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.