I-90 study & design

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.