The contractor for the segment of US 212 through Henry starts work there Monday, according to the state Department of Transportation.
Webster Scale Inc. plans to reconstruct the north half while traffic moves on the south half.
When the north half is done, the company plans to work on the south half while traffic uses the north half.
The $2.2 million project is scheduled to be done Oct. 19.
Vehicles will face a width restriction of 10 feet during the work.
The project includes grading, asphalt concrete surfacing, installation of curb and gutter, disability upgrades, sidewalks and roadway lighting.
Henry is a community of about 250 people in western Codington County. Watertown is to the east and Clark is to the west on US 212.