(Pottawatomie, 1932) across the Pottawatomie River in Osawatomie, Miami County, KS. 6th St. S. 1.0 miles from jct with Main St. in Osawatomie to the bridge. Marsh Arch triple span rainbow arch; highest arch 120’ high. (N38 29.12 W94 57.06) Photos by Ruth Reynolds 3-22-06.