More Lane Closures for Sioux Falls I-29 Diverging Diamond Project

The next phase of an ongoing major road construction project in Sioux Falls is going to temporarily close some lanes in the area.

According to the South Dakota Department of Transportation, the closures are planned at the intersection of Interstate 29 and 41st Street from 7:00 PM to 6:00 AM on both Tuesday (June 20) and Wednesday (June 21) for crews to work on removals of the bridge.

During the evening and overnight hours on Tuesday, there will be two-way traffic in the northbound lanes. During the evening and overnight hours on Wednesday, there will be two-way traffic in the southbound lanes.

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Access to Shirley Avenue from 41st Street in Sioux Falls is anticipated to reopen to through traffic on Wednesday.

The work is all part of the 41st Street Diverging Diamond Interchange Project, which has been underway at the I-29 interchange since April of last year.

When it's completed by June of 2024, the new interchange will increase traffic flow in the area and reduce the number of accidents getting on and off the interstate.

The project's website describes a diverging diamond interchange as:

The DDI resembles a conventional diamond interchange. Drivers make right turns at a DDI just as they would at a regular diamond interchange. Drivers who want to turn left cross over to the left side of the road and then make their left turn. Because traffic is on the left side of the road between the crossover points, all left turns occur without having to cross opposing traffic.