20th Street South & Interstate 29 Interchange

Photo 13

Project Update

The project was awarded to Bowes Construction in the fall of 2021.  Construction started in the fall of 2021 and is ongoing.  This project is being overseen by SDDOT who has hired Banner Associates Inc with HDR Engineering to assist with the construction administration.  Please see the Department of Transportation website for additional information.

Route/Detour Information

No Local detours are required at this time. Traffic on Interstate 29 should follow detour signs as needed. 

A future detour will be needed during work within the intersection of 20th Street South and 22nd Avenue. More information on this detour and the schedule for the closure will be posted once the Contractor has a better grasp on the timeline. 

Project Overview:

This project is adding a new Interstate exchange at 20th St. South (214th Street). Construction will continue from 2022 into 2023.

Completion Date:

July 14, 2023

Contract Amount


Contractor Name

Bowes Construction

Contact Information

Waylon Blasius

Banner Associates, Inc.

Construction Engineer

(605) 692-6342

Jeff Brink

SDDOT Engineering Supervisor

(605) 882-5166

Consultant Name


Banner Associates, Inc.

State Website