As first finders today of the "Harra Covered Bridge" box near Barlow,
Ohio, my husband and I have a warning for future seekers of this LB.
The box's home seems also to be the home of a medium-sized gray snake.
I think we woke him (or her) up from a nap and it wasn't interested in
leaving the scene.

This box is already precariously perched (no spoiler here- it's all
described in the clues), requiring one to choose between hanging over
a steel railing of a covered bridge, or approaching it from underneath
the bridge on a steep bank. Using teamwork with one gingerly poking
the box away from the snake with a walking stick and the other
catching it (the box, not the snake) before it fell into the creek, we
managed to get our "F". -Rose