I received a tip about this span and finally had the chance to check it out. Almost certainly a transplant off of a county road that has been used to gain access across McKillip Ditch. The trusses are in excellent shape and all parts appear to be original. Concrete abutments are in good shape and a very substantial added metal substructure has kept this bridge solidly in place. With a new deck this one could likely carry farm equipment again...although I would prefer to see it in a park or on a trail. Looks to be a WIBCo. product from the late 1870's or early 1880's.
Abandoned pratt pony truss bridge over McKillip Ditch on Field crossing