Road Closures 0 comments Road Closures posted by BrazoriaExpress March 11, 2019 March 11 -15. Northbound Frontage Road at FM 518 closed daily from 9:00 AM to 3:00 PM. March 11 – 15. Southbound Frontage Road form Discovery Bay Drive to Hickory Slough closed daily from 9:00 AM to 3:00 PM.