Interstate 90 Exit 46 Interchange - Piedmont

Project Summary:

The project will reconstruct Exit 46, including construction of a new, realigned overpass bridge to replace the existing structure, which has reached the end of its service life.

The new alignment will also carry traffic over the railroad, eliminating the at-grade crossing and improving safety and traffic flow in the area.

Sign Up for Text Notifications:

For updates on MAJOR traffic changes, subscribe to a free text-in service. To subscribe, simply text the keyword listed below to 605-566-4041. Subscribers can unsubscribe at any time. 

Text i90exit46 to 605-566-4041

Project Updates:

A reconstruction project on Interstate 90 at Piedmont (exit 46) began in mid- June 2026. Crews are currently building the new eastbound ramps at exit 46 and are also working along Elk Creek Road and Sturgis Road.

The project includes the full reconstruction of exit 46 and portions of Elk Creek Road and Sturgis Road in Piedmont. This is a multi-phased project. The initial phase includes the realignment of Elk Creek Road, reconstruction of a portion of Sturgis Road, construction of the new exit 46 ramps, and partial construction of the new bridges over I-90 and the railroad. This phase is anticipated to be completed by Wednesday, Nov. 25, 2026.

The second phase is scheduled to begin in March 2027, and to be completed by November 2027. This phase will include completing the bridges over I-90 and the railroad, opening the new interchange to traffic, demolishing the existing interchange, and reconstructing the westbound lanes of I-90 near exit 44.

The final phase is planned to begin in February 2028, and will include reconstruction of the eastbound lanes of I 90. This phase will continue through the overall completion of the project.

Project Photos: