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 and asphalt concrete surfacing on U.S. Highway 12 is being done to eliminate the existing reflective cracking and rough joints on the existing road. Undercutting and subgrade reconstruction through the heave area on S.D. Highway 1806 is being done to eliminate the existing pavement heaving and restore a normal crown to the highway. This work, combined with the milling and asphalt concrete resurfacing of S.D. Highway 1806, S.D. Highway 1806P and S.D. Highway 63 will restore a normal crown to the highways and provide for a smooth pavement surface. Guardrail is being replaced on all routes with bridges to improve safety, and culverts are being repaired as necessary to ensure proper drainage and extend the life of the roadway.
U.S. Highway 12
Work on the highway will include 3-4” of Cold Milling followed by reclaiming of 3-5” of inplace asphalt concrete and 4-5” of granular material. Once this material is reshaped and compacted, 4-5 ½” of Asphalt Concrete will be placed.
S.D. Highway 1806
Heave Area repair (south of bridge over railroad) will include removal of the top 3 feet of surfacing and subgrade material, reworking and compacting the subgrade material, placing 9” of Base Course and finally resurfacing with 4” of Asphalt Concrete.
S.D. Highway 1806 south of U.S. Highway 12, S.D. Highway 1806 north of U.S. Highway 12, S.D. Highway 1806 Spur Route to Wakpala, and S.D. Highway 63 north of McLaughlin
Resurfacing of these four routes will include 1” of Cold Milling followed by one 2” lift of asphalt concrete.
All Routes
Culvert repair will be done on all five routes and guardrail will be replaced at all bridge locations.
Project Timeline:
June 2025 - Nov. 2025
Project Updates:
Aug. 22, 2025:
Beginning the week of Monday, Aug. 25, 2025, an asphalt resurfacing project is scheduled for a 14-mile portion of U.S. Highway 12 west of Mobridge. The project will begin immediately west of the bridge over the Missouri River on Highway 12 and end north of the bridge over the Grand River to the northwest.
Operations will begin with cold milling of the existing asphalt concrete surface followed by the placement of base course material. Once the base course material has been shaped and compacted, the roadway will then be paved with two-inch lifts of asphalt concrete.
Traffic will be controlled with flaggers and a pilot car during working hours and open to two-way traffic during non-working hours. Motorists should be prepared for delays of up to 15 minutes. Once the base course is placed, motorists can expect to drive on a gravel surface. Motorists are cautioned to reduce their speed when traveling through the work zone.
This work is part of a larger overall project that includes the resurfacing of Highway 12, three sections of S.D. Highway 1806, and a two-mile section of S.D. Highway 63 north of McLaughlin.
Project Photos:
Project Contract Amount:
$24.1 Million
Project Contacts:
SDDOT:605-961-4930
Contractor:
Central Specialties
Alexandria MN
