More Lane Closures, Traffic Diversions Coming to Interstate 90

The latest Diverging Diamond Interchange project along Interstate 90 is about to enter its next phase and that will change how traffic flows in the area.

The South Dakota Department of Transportation has announced that beginning October 9 at 7:00 AM, the eastbound and westbound lanes on I-90 in Brandon will be diverted through the on and off-ramps at Exit 406.

This traffic diversion will be maintained overnight until 6:00 AM, October 10. This traffic pattern switch is being scheduled to remove forms from the exit bridge.

Traffic on South Dakota Highway 11 will be maintained during the diversion. Flaggers will be posted to guide Highway 11 traffic as Interstate traffic will have priority through this traffic pattern shift.

Depending on the work completed during the first night, motorists should be aware that a second night of traffic diversion is possible.

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The work is all part of a $41.3 project which includes the reconstruction of exit 406 with added lighting, signals, and mainline Interstate work. This project also includes three structure replacements. The interchange will be reconstructed as a Diverging Diamond Interchange. Westbound I-90 lanes (along with the railroad structure on I-90) will be reconstructed in 2024 and the eastbound lanes in 2025. The interchange itself and new structure over I-90 will be reconstructed between the 2024 and 2025 construction seasons.

The projected overall completion date is June of 2026.