1949,1986 Tarentum Bridge over Alegheny River at Tarentum, PA

(Archived Bridge Hunter; Bridge Hunter; Historic Bridges; pghbridges; Satellite) George Stuart Memorial Bridge

This 1,784' (544m) long bridge has a main span of 446' (136m). [HistoricBridges]

Street View, Sep 2021

Jackson-Township historical preservation posted

Richard & Robert Gunst in Tarentum Park with the Tarentum Bridge under construction in the background in Tarentum, Allegheny County in May of 1951. This photo is from the Alle-Kiski Valley Historical Society.

(Photo from Raymond Rieser via https://www.facebook.com/groups/232382343450800/)

Old Postcard via BridgeHunter

It is hard to see in the photos, but the bridge is on a significant slant with a bluff on one end and a flood plain on the other. 

pghbridges
"Elevation drawing looking downstream"

Jackson-Township historical preservation posted

Richard Gunst standing by the Tarentum Bridge being constructed across the Allegheny River in Tarentum, Allegheny County in November of 1950. This photo is from the Alle-Kiski Valley Historical Society.

(Photo from Raymond Rieser via https://www.facebook.com/groups/232382343450800/)