learn more about the I-90 project

About the Project 

The South Dakota Department of Transportation (SDDOT), in cooperation with Meade County and the Federal Highway Administration, is working to preserve the Interstate 90 (I-90) corridor between Exits 32 and 40. This 8-mile section of I-90 serves as the primary connection between Sturgis and Rapid City, South Dakota.

The SDDOT has determined the pavement in the eastbound lanes of I-90 between Exits 32 and 40 will need to be replaced within the next eight years. The pavement condition, combined with deteriorating drainage structures, substandard designs, and interchange capacity limits, has led the SDDOT to develop a comprehensive project to address all issues within the corridor. The project will include a corridor study, interchange analysis and justification, environmental documentation, and design plans. The project will culminate with the construction of the selected alternatives studied. Although more than one project may be required to implement all the necessary improvements, construction of the first project is planned for 2022.

Project Schedule

The I-90 Design and Study will follow a five phase plan between 2017 and 2022. 


Corridor Study: February 2018 - January 2019

Determination of Construction Projects: August 2018 - December 2018


Interchange Modification Justification Reports: March 2018 - July 2019


Environmental Studies: January 2018 - April 2021


Construction Plan Development: Project 1: January 2018 - September 2021

                                                     Project 2: January 2019 - May 2023 






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