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Armstrong Tunnel
The Armstrong Tunnel at Forbes Avenue. Duquesne University's Gumberg Library is visible in the background
Armstrong Tunnel is located in Pittsburgh
Armstrong Tunnel
Location in Pittsburgh
Armstrong Tunnel is located in Pennsylvania
Armstrong Tunnel
Location in Pennsylvania
Armstrong Tunnel is located in the United States
Armstrong Tunnel
Location in the United States
Location Between Forbes and Second Aves. at S. Tenth St., Pittsburgh, Pennsylvania.
Built 1926
Architect Covell, Vernon R.; Et al.
NRHP reference No. 86000015
Quick facts for kids
Significant dates
Added to NRHP January 7, 1986

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 noted for the Smithfield Street Bridge portals, the Pittsburgh 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. reports that since the air draft flows toward the river, bicyclists are able to travel through the tunnel in that direction "with little or no effort."

Since August 1987 the tunnels have provided cellular phone reception.


The tunnels were named in honor of Joseph G. Armstrong, County Director of Public Works. Most of the bridges over the Pittsburgh's three rivers were replaced between 1910 and 1940, years which included Mr. Armstrong's terms as Mayor of Pittsburgh and Allegheny County Commissioner.

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