Road Closure Scheduled on U.S. Highway 16A in Keystone

For Immediate Release:
Monday, Sept. 28, 2026

Contact:
Isaac Schulz, Project Engineer, 605-981-5089

KEYSTONE, S.D. – Beginning Monday, Oct. 5, 2026, U.S. Highway 16A in Keystone will be closed at the intersection of U.S. Highway 16A and S.D. Highway 40 for a bridge replacement project. A detour for the closure will be provided.

Traffic will be controlled with temporary traffic signals during the closure. A 12-foot width restriction and 50-foot length restriction will be in place for the duration of the closure. Highway 16A is scheduled to be reopened by April 2027.

The primary contractor for this $2.2 million project is Complete Concrete Inc. of Rapid City, SD. The overall completion date is Friday, May 21, 2027.

Featured Project Page:
Find additional information, construction timelines, and project maps on the SDDOT website at https://dot.sd.gov/16a-keystone.

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.org or dial 511.

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

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