ROANOKE, Va. -

The southbound ramp of Interstate 581 at Elm Avenue in Roanoke will be closed Monday and Tuesday night.

The detour will start at 10 p.m. Monday and Tuesday night, and be in place until 5 a.m. the following morning.

The ramp closure is needed for drainage work related to the Elm Avenue interchange improvement project, according to the Virginia Department of Transportation.