Historical Marker #1601 in Kenton County commemorates the Roebling Suspension Bridge, the first bridge to span the Ohio River. Opened to traffic on January 1, 1867, at the time the bridge was the longest suspension bridge in the world. The cost of the completed project totaled nearly $1.8 million.
In August 1855, the Covington and Cincinnati Bridge Company board of directors chose German émigré John August Roebling to be the architect of the bridge. Construction began in September 1856, but encountered several delays, including financial problems from the nationwide economic panic of 1857 and the outbreak of the Civil War. While the bridge was formally opened on January 1, 1867, it was later in the year when the Covington Street Railway Company laid rails for its horse-cars across the bridge. By 1895, nearly 1.4 million people crossed the bridge annually, and almost six-hundred streertcars crossed daily.
From 1895 to 1896, the bridge was restructured to accommodate an increase in traffic. This work led to the addition of two new steel cables, which doubled the original strength of the bridge. Other improvements included a new Cincinnati approach to the bridge well above the normal floodplain, which allowed the bridge to remain open during the devastating 1937 Ohio River flood.
The bridge company sold the structure to the Commonwealth of Kentucky in 1953. Nearly twenty years later, it was listed on the National Register of Historic Places and became a National Historic Landmark. The American Society of Civil Engineers honored the bridge as a national historic civil engineering landmark in 1983. That same year, the span was renamed the John A. Roebling Bridge in honor of its engineer, who also designed the famed Brooklyn Bridge in New York City.