The Otowi Suspension Bridge near San Ildefonso, New Mexico, is a 1924 single-lane wooden suspension bridge over the Rio Grande that played a major role in the state’s transportation history by opening much of northern New Mexico to automobile travel, including Bandelier National Monument, the Pajarito Plateau, Los Alamos, and later the nationally significant Los Alamos National Laboratory during World War II. Noted for its engineering importance as the only public highway suspension bridge in New Mexico and rated the state’s best bridge in a 1987 survey, it was recognized as a contributing property in the Otowi Historic District in 1975 and individually listed on the National Register of Historic Places in 1997. The bridge carried vehicles until 1948, when it was replaced by a nearby two-lane steel through truss bridge, itself at the time the longest road bridge in New Mexico, and today the historic suspension bridge remains in use as a pedestrian crossing.