Drivers in Williamson County are urged to consider alternate routes Sunday night as The Texas Department of Transportation shuts down Interstate 35 at exit 254 or FM 3406/ Old Settlers Boulevard.

TxDOT said crews will work to install large beams for a new southbound to northbound U-turn bridge.

Both directions of FM 3406 over I-35 will close beginning at 8:30 p.m., and won't reopen until 5 a.m. Monday. The northbound I-35 main lanes will be closed and traffic will be detoured to the frontage roads at exit 254 from 10 p.m. until 5 a.m.

Officials said drivers wishing to cross I-35 at FM 3406 will be detoured to RM 1431 or U.S. 79. Detour road signs are already set in place, TxDOT said.