A closeup look of this photo reveals that this bridge was an example of WIBCo's Hammond design or Pratt variant that featured normal diagonals with counters that cross 2 panels. The bridge was 2 spans of 8 panels and would have been pinned and made of wrought iron.
Upper Wagon Bridge
Approximate latitude, longitude
+42.20376, -91.52646(decimal degrees) 42°12'14" N, 91°31'35" W (degrees°minutes'seconds")