BRANDON, S.D. – On Monday, May 5, 2025, the westbound off-ramp on Interstate 90 at Brandon (exit 406) will be closing as part of the Diverging Diamond Interchange (DDI) construction project. Motorists traveling westbound on I-90 to Brandon should use exit 410 and follow the signed detour south to County Road 138 (Asphalt Boulevard) and then west into Brandon. The westbound exit 406 off-ramp closure and detour will be in place until late June 2025.
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 prime contractor for this $41.3 million project is T & R Contracting of Sioux Falls, SD. The overall completion of the 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:
The mission of the South Dakota Department of Transportation is to provide a safe and efficient public transportation system.
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.
