This spot is where Relief Street used to continue across the river via the Smithman Bridge, also called the Relief Bridge or the Relief Street Bridge, connecting to Central Avenue on Oil City's south side. John B. Smithman built the bridge so his Oil City Railway Company's streetcars could cross the Allegheny. Construction started in 1892 with the first streetcar crossing on November 30th, 1893. The bridge was 830 feet long, had two sets of tracks, and a covered walkway. I have no idea what happened to it. :)