TARKIO, Mo – Route AA in Atchison County is scheduled to close, according to the Missouri Department of Transportation. Local maintenance crews will close Route AA from U.S. Hwy 59 to O Avenue for a culvert replacement on Thursday, October 16, 2014, from 7 a.m. to 4 p.m., weather permitting. During this closure, motorists will need to use an alternate route.