The state Department of Transportation and city officials will meet Thursday at City Hall to outline plans for improvements to rail crossings near the U.S. Route 1 viaduct.

Jeff Pitcher, a transportation operations manager for rails with the DOT, said he already has met with city officials. The purpose of Thursday’s meeting, he said, is to inform the public.

Pitcher said the DOT will dig two feet beneath the crossings on Washington Street as it intersects School and Vine streets, then repair and resurface the crossings.

The DOT wants to complete the project in just two days — May 13 and 14, Pitcher said.

“Hopefully, by that Wednesday morning, we’ll have it back open,” he said. “We’ll close the Washington-and- Vine intersection, and the detour will be minimal.”

Pitcher said that the work is being done to upgrade the structure, which was last rebuilt in the early 1980s.

The DOT will eliminate the second crossing, at the dead end that leads to Bath Iron Works, Pitcher said.