ROCK PORT, Mo. – Southbound Interstate 29 will be narrowed just south of the Iowa state line, according to the Missouri Department of Transportation. On Tuesday, Dec. 16, at approximately 2 p.m., local maintenance crews will close the driving lane of southbound I-29 between mile markers 124 and 123 to perform routine maintenance on the bridge over the Nishnabotna River. The lane will remain closed overnight and should reopen after 3 p.m. on Wednesday, Dec. 17. All planned work is weather permitting.