Irene - S.D. Highway 46 from U.S. Highway 81 to Irene

Detour Map:

Project Summary:

This project is a 12-mile-long full reconstruction of S.D. Highway 46 in Yankton County. The project begins at the US81/SD46 intersections and ends at the west edge of the City of Irene. Work on this project will consist of full roadway grading, structure replacement, culvert replacement, interim surfacing, intersection lighting at US81/SD46 and new permanent signing.

During construction, the highway will be closed to through traffic. Access to residents and landowners adjacent to the project will be maintained, but travelers are encouraged to use the signed detour route around the project. The detour route around the project includes S.D. Highway 19 to U.S. Highway 18 and U.S. Highway 81.

Project Timeline: 

November 17, 2023 completion date.

Project Press Releases: 

July 13, 2022

July 7, 2022

Project Updates: 

Completed Work: The contractor set up the detour and closed the road to thru traffic. Box culvert construction has begun on 2 box culverts in the west 4 miles.

Anticipated work to be completed in November 2022: The contractor will continue to work on the new box culverts at Stations 96 and 221.

July 13, 2022:

Due to constructability issues with the traffic diversions, S.D. Highway 46 will be closed to through traffic on approximately Thursday, July 21, 2022. This is a process change from previously released information.  

During the closure, motorists will be directed to use the signed detour route on S.D. Highway 19, U.S. Highway 18, and U.S. Highway 81. Access to residences and property adjacent to the project will be maintained for local traffic.


Project Photos:

Fall 2022:
(First box being constructed, First box complete, Second box location, box backfill)


Spring/Summer 2022: 


Project Contract Amount:

$19.3 million


Project Contacts:

Contractor: Foothills Contracting, Inc.

SDDOT: Brian Wenisch (605) 668-2929 x 48


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