1962 PA-59 Cornplanter Bridge over Allegheny Reservoir (Kinzua Dam) near Warren, PA

(Archived Bridge Hunter; Bridge Hunter; no Historic Bridges; Satellite)

"Longest bridge in Warren County. Named after Cornplanter, a Seneca war chief and diplomat. Later renamed in 1978 for James Morrison, the first permanent settler in Kinzua Township, though the Cornplanter name is still commonly used." [ArchivedBridgeHunter]

I always like photos of bridges built to span a reservoir before the reservoir is filled.

Jackson-Township historical preservation posted
Bridge over the Kinzua Dam (Allegheny Reservoir), located on Route 59 just east of the city of Warren, PA in the 1960s.  The Allegheny Reservoir on the Allegheny River is a flood control project but also provides many forms of outdoor recreation in the surrounding areas.

Scott T, May 2019

This 1813' (554m) long bridge has spans of 300' (91m). [BridgeHunter]