State route 172 at mile point 8.405 in Johnson County will be closed most of the day on Thursday, June 7, 2018 due to road work. The area is near Stapleton Branch. District 12 Engineer Tim Spencer said the Johnson County maintenance crew will replace a collapsed cross drain that runs under the pavement. Work will begin around 8am, with the pavement sawed open to remove the damaged cross drain, then the new drain installed and covered, and pavement replaced. Drivers must find an alternate route as there will be no through traffic allowed during the replacement.