Traffic Switch Scheduled on I-90 and Exit 406 at Brandon

For Immediate Release: 
Monday, March 31, 2025

Contact: 
Michael Noonan, Project Engineer, 605-367-5680 

BRANDON, S.D. – On Monday, April 7, 2025, a two-way traffic configuration will be placed on westbound Interstate 90 at Brandon (exit 406) as part of the Diverging Diamond Interchange (DDI) construction project. This two-way traffic configuration will be in place through the summer months as the second phase of construction is completed on this project.

The traffic diversion on S.D. Highway 11 over the Exit Bridge at I-90 will remain as one lane of traffic north and one lane of traffic south from Ash Street North. This configuration will be in place until the second half of the structure is complete. Access to businesses between exit 406 and Ash Street North will remain as only right-turn in and right-turn out. 

The second phase of reconstruction 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 prime contractor for this $41.3 million project is T & R Contracting of Sioux Falls, S.D. The overall completion of the Diverging Diamond Interchange (DDI) reconstruction project at Brandon (exit 406) is June 2026.

Featured Project Information:
Find more information about this project on the SDDOT website at https://dot.sd.gov/i90-exit406-brandon-pcn-4433.

Sign Up for Text Notifications:
For updates on MAJOR traffic changes about this project, subscribe to a free text-in service. To subscribe, simply text "I90Exit406" to 605-566-4041. Subscribers can unsubscribe at any time. 

About SDDOT:
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For the latest on road and weather conditions, road closures, construction work zones, commercial vehicle restrictions, and traffic incidents, please visit https://sd511.org or dial 511.

Read more about the innovative work of the SDDOT at https://dot.sd.gov.

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