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:
July 24, 2026:
Anticipated Work in Aug. 2026: August work will include flush seal, permanent striping, permanent seeding and installation of delineators.
Completed Work in July 2026: Blending and stockpiling of millings and base course is complete. Bump grinding should be completed by the end of July.