Southern end of the abandoned County Line Bridge, which formerly carried County Line Road (Louisa County to the right and Washington County to the left) over Long Creek just west of Columbus Grove, Iowa, United States. The old right-of-way remains on the map, but mosquitos, not humans, are its primary users, while the bridge's wooden floor and railings are unable to hold even the weight of a human. Built in 1893, it is listed on the National Register of Historic Places.