S.D. Highway 73 - Kadoka to the White River

Project Summary:

S.D. Highway 73 - From South of the White River to Kadoka

• Grading
• Structure Work
• Interim Surfacing
• Lighting

Project Timeline:

March 2025 - June 2026

Project Updates:

Nov. 24, 2025:

Oct. 15, 2025 – Nov. 15, 2025 Completed Work: The contractor completed unclassified excavation at multiple locations north of the White River bridge and at the location south of the bridge. Old base course removal and undercut continued. Crews continued placing new base course and grading the roadway, progressing northward. Final ditch grading advanced to allow permanent seeding and fence installation to continue. End-of-season cleanup and checklist items began.

Anticipated Work Nov. 15, 2025 – Dec. 15, 2025: The contractor plans to complete work required for the interim (end-of-season) completion date. This includes finishing cleanup and checklist items. Crews plan to complete hauling base course and apply magnesium chloride to stabilize it for winter. Ditches are planned to be sloped, graded, and mulched—seeded where possible—for winter protection. Erosion control measures will continue and be completed for all disturbed areas that require them.

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Nov. 17, 2025: 

S.D. Highway 73 from Kadoka south nine miles is currently closed due to muddy conditions and unsafe travel on the construction project.
 
It is anticipated that Highway 73 will reopen on Tuesday, Nov. 18, 2025.

STATEWIDE CONSTRUCTION PROJECTS PAGE

PCN: 05HV