Brookings - Intersection on Interstate 29 & 20th St. South

Project Summary:

This project is the construction of a new interstate interchange on the south side of Brookings.  This interchange will make traveling south out of Brookings much quicker and less congested.   

Location: Intersection on I-29 & 20th St South in Brookings

For additional information about this project, view:

Project Timeline: 

Anticipated Start Date: March 28, 2022
The project is anticipated to be completed during the summer of 2023.

Pedestrian Detour Map:

Traffic Control Map:

Project Updates: 

Completed Work: The contractor is working on grading operations including the remaining ramps and 20th Avenue.  Installed Curb and Gutter, fillets, curb ramps, sidewalk, at the 22nd Ave intersection.  Begun installed traffic signals at the 22nd Ave intersection.  The contractor scarified and recompacted the bridge berms and Granular Bridge End Backfill material

Anticipated Work to be completed in November: The contractor will install temporary pavement markings at the 22nd Ave intersection.   Bowes will complete fine grading of the 20th Street mainline.  Will get the signals up at the 22nd Avenue intersection.  The Contractor will complete the concrete on the shared use path.  The contractor will install base course pads on I-29 where the guardrail will be installed.  Asphalt shoulder on I-29 will be installed.


News Stories: 

Dakota News Now 10/10/2022

Dakota News Now 05/01/2022

Brookings Register Article 04/26/2022

Brookings Register Article 01/12/2022

Project Press Releases: 

November 7, 2022 The South Dakota Department of Transportation (SDDOT) says that the two-way traffic zone currently in place on Interstate 29 near Brookings will come to an end on Friday, Nov. 11, 2022. Traffic will return to utilizing both lanes northbound and southbound on I-29.

September 28, 2022 
The South Dakota Department of Transportation (SDDOT) says that the contractors for the 20th Street Interchange project and the Brookings Municipal Utilities (BMU) watermain utility project continue to make progress on the improvements at the intersection of 22nd Avenue and 20th Street South.

August 8, 2022

July 11, 2022

July 8, 2022

June 28, 2022

May 31, 2022

April 14, 2022

Project Videos:

Project Photos: 

October 2022:
(Lto R: overview of 22nd Ave intersection before paving, an overview of 22nd Ave intersection after paving, Sidewalk concrete pour)


September 2022:
(LtoR: Storm Sewer Pipe installation, Bridge overview, Box culvert installation)


August 2022:
(L to R: Overview of the completed bridge deck pour and grading of 20th Avenue, Bridge deck pour overview, Bridge Deck Pour placing concrete)


July 2022:
L to R: Overview of the bridge construction, bridge piling, grading)

June 2022: 
(L to R: Concrete for bent cap, Bridge Piling, Grading)


May 2022:

(Groundbreaking Ceremony 5/11/2022- photo courtesy of the City of Brookings)



Project Contract Amount:

$15.3 Million

Project Contacts:

Bowes Construction Inc

Waylon Blasius, Project Manager, 605-692-6342
Jeff Brink, SDDOT Engineering Supervisor, 605-882-5166 


Project PCN:  

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