Road construction is set to begin Tuesday, April 7, on U.S. Highway 85 near Spearfish. Crews will start building new left‑turn lanes at Crook City Road, just south of Interstate 90’s Exit 17.
Two‑way traffic will stay open throughout the project, but a 10‑foot width restriction will be in place in both directions. Oversized vehicles will need to use a signed detour on Highway 14A and I‑90.
Drivers are encouraged to plan ahead and check road conditions at SD511.org or by dialing 511.
