I am not for sure if it is tractors. I couldn't make it out from the photo, and can't remember what it said the day I was there. Downward perspective of the rusting truss, and the creek below. Another shot of the bridge. The top bar of the right side of the bridge is badly rusting, more so than the rest of the bridge structure.
Flaky rust is evident.
The pavement rutting and heaving is also more prevelent in this photo. From this photo, U.S. 60 is dead ahead.