Armstrong Tunnel

The Armstrong Tunnel in Pittsburgh, Pennsylvania, connects Second Avenue at the South Tenth Street Bridge, under the Bluff where Duquesne University is located, to Forbes Avenue between Boyd Street and Chatham Square. The tunnel was constructed between 1926 and 1927. The chief engineer was Vernon R. Covell of the Allegheny County Public Works Department. The tunnel portals were designed by a city architect, Stanley L. Roush, who is also is noted for the Smithfield Street Bridge portals, the City-County Building, the Corliss Tunnel, and many other municipal projects. The tunnel itself is characterized by twin bores of horseshoe cross-section, and bends halfway through. It also has a pedestrian walkway on the western side. Pghbridges.com...