U.S. Highway 16A in Keystone
Project Summary:
The primary purpose of the project is to replace the existing bridge with a box culvert. The bridge has reached the end of its expected service life.
Additional work includes minor approach grading for the new structure, intersection improvements, surfacing, pavement markings, signals, Americans with Disabilities Act (ADA) upgrades and erosion control. Pedestrian facilities will be improved to accommodate pedestrians on both sides of the structure.
A temporary restroom facility will be provided throughout construction.
Project Detour:
Project Updates:
April 30, 2026:
On Thursday, May 14, 2026, the South Dakota Department of Transportation (SDDOT) in collaboration with Complete Concrete, Inc. will hold a preconstruction informational meeting to discuss the bridge replacement project on U.S. Highway 16A in Keystone. The open house style informational meeting is scheduled from 4:30 p.m. – 6:30 p.m. (MT) at Keystone Community Center, located at 1101 Madill St. in Keystone.