U.S. Highway 85 – Spearfish to Deadwood

In partnership between the South Dakota Department of Transportation (SDDOT) and the Federal Highway Administration (FHWA), a planning-level corridor study is being performed for the portion of U.S. Highway 85 (US85) between the cities of Spearfish and Deadwood in South Dakota. The purpose of this study is to evaluate existing and future conditions of the corridor and potential improvements related to roadway conditions, traffic operations, and safety.

Project Area

The study corridor begins at Duke Parkway, just north of I-90 at Exit 17 in Spearfish. It continues south to the junction with U.S. Highway 14 Alternate (US14A) in Deadwood.

Process Overview

The SDDOT assembled a Study Advisory Team (SAT) comprised of representatives from SDDOT, City of Spearfish, City of Deadwood, Lawrence County and the Federal Highway Administration to guide the development of the corridor study. Project area stakeholders and the public will be invited to provide input on the study and recommended improvements.

Work on the corridor study began in winter 2022/2023. Additional information about the project will be made available as the project progresses and in advance of any public meetings, with the first scheduled for summer 2023.

Open House Meeting

Our second public open house meeting is scheduled for Tuesday, February 27, 2024, from 5:30-7:30 p.m. at the Wilbur S. Tretheway Pavilion (115 S. Canyon Street, Spearfish).

The meeting materials will be accessible on this website on the day of the public meeting.

To view the materials from the last meeting, please click the links below:

July 2023 Meeting materials:
Fact Sheet
Display Boards
Presentation Slides

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