Lengthy Ramp Closure Coming to I-90 in South Dakota

The ever-changing traffic patterns of an ongoing project on Interstate 90 in South Dakota are about to enter a new phase.

WHAT IS CHANGING?

Beginning Monday (May 12), the eastbound on-ramp to Interstate 90 at Brandon (Exit 406) will be closed as part of the Diverging Diamond Interchange (DDI) construction project.

DETOUR INFORMATION

Motorists planning to travel eastbound on I-90 should use Exit 410 via the signed detour route using S.D. Highway 11, County Road 138 (Aspen Boulevard), and County Road 105.

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HOW LONG WILL THE RAMP BE CLOSED?

The South Dakota Department of Transportation says the closure and detour will be in place until the reconstruction of the eastbound on-ramp at Exit 406 is complete in mid-July 2025.

PROJECT INFORMATION

The second phase of reconstruction on this DDI project includes completing the remaining on-- and off-ramps, the eastbound lanes of I-90, the Exit Bridge, and the replacement of the eastbound I-90 bridge over the BNSF railroad. The second phase of construction will be ongoing until November.

The $41.3 million project is expected to be completed in June 2026.

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