Interstate 90 - Exit 406 (Brandon)

Project Summary:

This project includes the reconstruction of exit 406 (Brandon) with added lighting, signals, and mainline Interstate work. This project also includes three structure replacements.

The interchange will be reconstructed as a diverging diamond configuration.
Westbound Interstate 90 lanes (along with the railroad structure on I90) will be reconstructed in 2024 and the eastbound lanes (and railroad structure in 2025). The interchange itself and new structure over I90 will be reconstructed between 2024 and 2025.
S.D. Highway 11 traffic will be maintained across Interstate 90 during construction.
The westbound on-ramp and eastbound off-ramp are expected to be open to traffic for the majority of the project. Closures for the westbound off-ramp and eastbound on-ramp are planned for 2025.
Work will extend on S.D. Highway 11 down to Redwood Boulevard. That work includes adding a shared use path on the west side, approach and side street work, a retaining wall on the east side north of Ash St, and other items.

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Project Timeline:

Spring 2024 - Overall Completion Date: June 2026

Minor clean-up work to be completed in 2026

Project Updates:

June 20, 2025:

May 15, 2025 – June 15, 2025, Completed Work: The closure of the westbound off-ramp was followed by a closure of the eastbound on-ramp. All storm sewer has been placed. Grading and graveling of both ramps are near completion. A portion of the westbound off-ramp has been paved. All large panel walls have been completed. Pile for footings of the railroad structure has begun. The abutments and center column are complete on the exit structure. Eastbound lanes have been partially paved up to the bottom of the eastbound on-ramp.

Anticipated work June 15, 2025 – July 15, 2025: The westbound off-ramp will be completed up to S.D. Highway 11 for reopening as well as the eastbound on-ramp pavement. Girders are expected to be set during phase two of the exit structure in late June and possibly begin building of the bridge deck. Grading on the eastbound mainline is anticipated to be completed and graveled. Remaining topsoil should be placed on both the eastbound and westbound ramps. At the railroad it is anticipated that the center columns should be built above ground and pile placed for the abutments of the bridge.

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June 17, 2025:

Beginning at 7 p.m. on Wednesday, June 25, 2025, the eastbound and westbound lanes on Interstate 90 at exit 406 (Brandon) will be temporarily closed for crews to set bridge girders. During the closure, traffic will be diverted through the on- and off-ramps and back onto I-90. This traffic diversion is scheduled to be in place until 7 a.m. on Thursday, June 26, 2025.

Lane closures and traffic diversions on I-90 at exit 406 (Brandon) are also planned from 7 p.m. on Thursday, June 26, 2025, through 7 a.m. on Friday, June 27, 2025. The second night of the scheduled traffic diversion is for crews to install components to build the bridge deck.

Traffic on S.D. Highway 11 will be maintained during both overnight traffic diversions and guided through the work zone with the use of flaggers.

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. Weather dependent, the second phase of construction will be ongoing until November 2025.

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April 25, 2024:

March 26, 2024 - Dakota News Now:

Watch the full story here