Grading Projects Scheduled to Begin on U.S. Highway 16A and S.D. Highway 87 Near Custer

For Immediate Release:
Monday, Nov. 2, 2026

Contact:
Montana Rivard, Project Engineer, 605-981-5089

Grading Projects Scheduled to Begin on U.S. Highway 16A and S.D. Highway 87 Near Custer

CUSTER, S.D. - Beginning Tuesday, Nov. 3, 2026, two curve-straightening projects are scheduled to begin on U.S. Highway 16A and S.D. Highway 87 in Custer State Park.

On U.S. Highway 16A, the project is located from mile marker 45.6 to 45.9, approximately one-half mile south of S. Playhouse Road. On Highway 87, the project extends from mile marker 57.2 to 57.5, approximately one-half mile south of the intersection with Highway 16A. The projects include grading, surfacing, and pipe work to realign and improve two existing curves.

Traffic Impacts:
Traffic will be controlled by flaggers and a pilot car during working hours. The roadways will remain open during evening hours. Motorists should expect delays of up to 10 minutes and are advised to reduce speed and use caution when traveling through the work zones.

The prime contractor for this $1.6 million project is Mainline Contracting, Inc. of Rapid City. The overall project completion date is Friday, July 2, 2027.

About SDDOT:
The mission of the South Dakota Department of Transportation is to provide a safe and efficient public transportation system.

For the latest on road and weather conditions, road closures, construction work zones, commercial vehicle restrictions, and traffic incidents, please visit https://sd511.orgor dial 511.

Read more about the innovative work of the SDDOT at https://dot.sd.gov.

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