Keystone - S.D. Highway 40 Sidewalk

Project Summary: 

This project will join the existing sidewalk with a new sidewalk and provide ADA-compliant ramps at all pedestrian crossings. The project is scheduled to begin on March 14 beginning at 3rd Street and progressing to the east at least to Mitchell Street on or before June 24th, 2022. No work will be allowed from June 24th to August 19th (inclusive). The remaining work to the eastern city limits will occur after August 19th. Access to all businesses and residences will be maintained throughout the life of the project. Traffic may be controlled by flaggers when adequate space is not available. Otherwise, two-way traffic will be maintained with reduced speeds.  

Location: SD 40 through the town of Keystone from 3rd Street to the eastern city limits.  

Project Updates: 

The contractor began work on March 14 beginning at 3rd Street and progressing to the east at least to Mitchell Street. Construction of sidewalk, ADA ramps, and curb & gutter is concentrated on the west side of SD 40 mainly around the intersections with Blair and Mitchell Streets.


Forming curb & gutter at Halley’s Store

Curb & gutter on the northwest corner of Blair Street and SD 40 intersection

Curb & gutter poured at the Rock Shed

Project Contract Amount:



Project Contacts:

Contractor: Complete Concrete, Inc.

SDDOT: Jay Noem, Project Manager 605.440.1220


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