The Macomb’s Dam Bridge (originally Central Bridge) and 155th Street Viaduct, constructed in 1890-95 to the designs of eminent structural engineer Alfred Pancoast Boller, for the N.Y.C. Departments of Public Parks and Public Works, was a considerable municipal undertaking as well as a significant feat of engineering. The Macomb’s Dam Bridge is the third oldest major bridge in New York City (after the Brooklyn and Washington Bridges) and is also the city’s oldest intact metal truss swing-type bridge, a bridge type most often employed in New York City along the Harlem River between the 1880s and 1910.