Keywords: usgs floods iowa midwest flooding midwestflooding outdoor Unused railroad bridge that collapsed, part of which is being washed downstream (Waterloo, IA) (photography: Don Becker, USGS) usgs.gov/june08floods Unused railroad bridge that collapsed, part of which is being washed downstream (Waterloo, IA) (photography: Don Becker, USGS) usgs.gov/june08floods |