U.S. Highway 12 - S.D. Highway 1806 and S.D. Highway 63
Project Summary:
U.S. Highway 12 – From 12 miles east of McLaughlin to west of Mobridge
Full-depth reclamation completed in 2025 and asphalt concrete surfacing on U.S. Highway 12 will address cracking and rough joints. Subgrade reconstruction on S.D. Highway 1806 will correct heaving and restore a normal crown. Additional milling and resurfacing on Highway 1806, S.D. Highway 1806P and S.D. Highway 63 will improve ride quality. Guardrail will be replaced at bridges, and culverts repaired as needed.
Project Updates:
June 29, 2026:
Anticipated Work in July 2026:
Remaining work includes installation of rumble strips, application of a flush seal and placement of permanent pavement markings.
Erosion control work on the slide area (SD 1806) and shoulders of U.S. Highway 12 also remains; however, seasonal restrictions will delay this work until August.
Completed Work in June 2026:
The contractor completed paving on all routes.