Louis Wernwag

(Wikipedia) Louis Wernwag (b. Alteburg, Württemberg, Germany, 4 December 1769; d. Harpers Ferry, Virginia, 12 August 1843) was a prominent bridge builder in the United States in the early 19th century.
... He constructed the first Conowingo Bridge in 1818 and rebuilt Theodore Burr's Port Deposit Bridge in 1824, both crossings of the Susquehanna River in Maryland. His last bridge was across the Potomac River at Harper's Ferry for the Baltimore and Ohio Railroad, and was built in 1833. Continued