Benjamin Henry Latrobe II
of Philadelphia, Pennsylvania
BO - Harper Ferry Bridge (Jefferson County, West Virginia)
Designer, 1836Lost Through truss bridge over Potomac River on Former B&ODestroyed by disaster
CSX - Thomas Viaduct (Howard County, Maryland)
Designer, 1835Eight-span stone arch bridge over Patapsco River on the B&O Railroad between Relay and ElkridgeOpen to traffic
ST - Hoosac Tunnel (Berkshire County, Massachusetts)
Built 1854Tunnel under Hoosac Mountains on Pan Am RailwaysOpen with daily traffic