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"