The Sixth Street bridge, one of the three identical sister bridges spanning the Allegheny river at downtown Pittsburgh, is one of the few surviving examples of large eyebar suspension bridges in the United States. The site did not allow for typical anchorages so the bridges were built with a unique self-anchored suspension design consisting of steel eyebars, the first such self-anchored suspension bridges constructed in this country. The American Institute of Steel Construction named the Sixth Street Bridge as the "most beautiful steel bridge" of 1928.