Public Domain: Published Prior to 1923
BH Photo #249507
Fascinating looking around these man-made lakes. In bing bird's eye, you can see small bridges, culverts, roadways, and foundations near the lake on abandoned roads. Even a bridge on what appears to be old 14 that is now apparently part of a fishing jetty at 41.432982,-93.100511.
Pennsylvania through trusses with Camelback format (5 slope) upper chords.
Where's the link? It it very useful to know what it looks like so that we can help you answer your question......