Construction on the diverging diamond intersection upgrade at Interstate 70 and Mid Rivers Mall Drive is underway in St. Peters.
Work started in March as crews began to build a diverging diamond interchange and add an additional lane to westbound I-70. The $13 million project is being paid for with federal, regional and local money.
The Missouri Department of Transportation expects the project to be completed in time for the holiday shopping season at Mid Rivers Mall. The project is expected to be completed by Oct. 31.