1935-1996 US-421+IN-39 Bridge over Wabash River at Delphi, IN

(Bridge Hunter; no Historic Bridges; Satellite, it was replaced by a UCEB in 1996)

Photo taken in 1935 (courtesy of Carroll County Historical Museum) via BridgeHunter

Photo taken ca. 1936 (courtesy of Carroll County Historical Museum) via BridgeHunter
[It looks like some sort of load test or publicity photo with all of the cars closely packed on it.]

Bridges Now and Then posted
The Wabash River Bridge, State Road 39. Delphi, Indiana, 1935. (Granville C. Thompson-Perdue University)
Tn T Gorgia: Nice falsework for the arch barrel.
Theron Stratton: A lot of skilled manual labor went into any concrete arch bridge. When labor started becoming higher priced than steel or precast, we lost the arches.

Bridges Now and Then posted
Construction on the Wabash River Bridge at Delphi, Indiana, September, 1935. (Purdue University)

Theron Stratton commented on his comment
I did actually build one in Des Moines IA in 2005. Sort of a monumental bridge and needless to say, the falsework looked nothing like this.