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

Project Summary:

This project is a 12-mile-long full reconstruction of S.D. Highway 46 in Yankton County. The project begins at the U.S. Highway 81/S.D. Highway 46 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 U.S. Highway 81/S.D. Highway 46, 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 2023: 

April 4, 2023 - Summer 2024

Project Updates: 

May 1, 2024: 

Foothills Contracting has several items to complete this spring. This work will include some remaining pipe work, fence installation and repairs, maintenance of the gravel surface, and punch list items. Spring rain has caused extensive erosion that will be repaired and stabilized.

The remaining work will be completed as weather and field conditions permit.


Dec. 12, 2023: 

IRENE, S.D. – The South Dakota Department of Transportation (SDDOT) says that S.D. Highway 46, from U.S. Highway 81 to the west edge of the city of Irene, is scheduled to reopen to through traffic on Friday, Dec. 15, 2023. This portion of Highway 46 has been closed to through traffic since April 2023.

The temporary interim surfacing consists of a chip sealed blotter for the first four and one-half miles east of the Highway 81 junction. The remaining seven and one-half miles will be gravel surfacing treated with dust control chloride. Motorists should expect a rough road, loose gravel, and no pavement marking for the gravel surface portion of the project. A posted reduced speed limit of 55 mph will be in effect for the entire length of the project until final paving operations are completed during the summer of 2024.

The prime contractor will be responsible for maintenance of the gravel surfacing, with snow and ice removal operations to be performed by SDDOT crews.


News Stories:

Yankton Daily Press & Dakotan 03/30/2023: Highway 46 Project Ready to Roll Again

Project Photos:

2023 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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