S.D. Highway 47 Lyman County Fort Thompson to Iona

Project Summary:

This project will consist of asphalt concrete surfacing, pipe repair, and box culvert replacements.

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Project Timeline:

Spring 2025 - Fall 2025

Project Updates:

Aug. 22, 2025:

July 15, 2025 – Aug. 15, 2025, Completed Work:

• The contractor completed all mainline pipe replacements and box culvert installations.
• Mainline asphalt paving north of I-90 is complete.
• Pipe repair work continues throughout the project.
• Highway 47 has reopened from the intersection of SD Hwy 44 & 47 to the intersection of SD Hwy 47 & 49.
• Cold milling was completed across the entire project.

Anticipated Work Aug. 15, 2025 – Sept. 15, 2025:

• Asphalt paving will continue from north to south.
• Flush sealing will be completed from Hwy 49 to the north end of the project.
• Pipe repairs will continue throughout the project.
• Guardrail widening will be completed at the White River Bridge.
• Topsoil replacement will begin along the project.

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Aug. 7, 2025: 

As of Thursday, Aug. 7, 2025,  S.D. Highway 47 from the junction with S.D. Highway  44 north to the Highway 49 junction will reopen to traffic. This section of Highway 47 was closed over the past month for the installation of a new precast box culvert. 

Work will continue on the project from the Highway 47/Highway 49 junction north toward Interstate 90. 

The prime contractor on this $21.2 million reconstruction project is Spencer Quarries Inc. from Spencer, SD. The overall project completion date is Friday, Nov. 14, 2025. 

Project Photos:

STATEWIDE CONSTRUCTION PROJECTS PAGE

PCN: 05UN, 06Q8, 069Q, 06YC