South Dakota Department of Transportation Skip to main content

Contact Us Submit comments and questions to the project team using this form.

The South Dakota Department of Transportation (SDDOT) and its partners are studying Exit 86 on Interstate 29 to determine what modifications might be needed at this interchange to accommodate future growth and traffic volumes.

Planning Study Goals

  • Develop an Interchange Modification Justification Report for the Federal Highway Administration
  • Create Environmental Screen Report and National Environmental Policy Act documents for future planning
  • Provide guidance to implement recommended improvements for future construction

Interchange Options

The project teams will be analyzing two interchange examples that were identified in the SDDOT 2020 Decennial Study. Additionally, up to two additional options will be identified and analyzed as part of the study.

Option 1: Bridge Widening and Turn Lanes

Coming soon!

Option 2: Single Point Urban Interchange (SPUI)

Coming soon!

The Study Area is located at the intersection of I-29 and 258th Street (Exit 86) near Renner and Crooks.

Click to enlarge.


Interchange modifications require various studies and screening reports. This project begins with data collection and analysis to help us develop and refine modification options. Next is the development of the Interchange Modification Justitification Report (IMJR) and Environmental Screening Report (ESR). A more detailed Environmental Analysis occurs during the National Environmental Policy Act (NEPA) process. Lastly, an interchange design is finalized. This design will kick-off the construction phase of this project.

  • Data Collection & Analysis

    Spring/Summer 2022
  • Public & Stakeholder Meetings

    July 2022
  • Develop & Refine Build Options

    Summer 2022
  • Draft IMJR
    Draft ESR

    Fall 2022
  • Public & Stakeholder Meetings

    Fall 2022
  • Submit Final IMJR
    Submit Final ESR

    Fall/Winter 2022
  • Draft NEPA

    Winter/Spring 2023
  • Submit Final NEPA

    Spring/Summer 2023

Design: Anticipated 2024-2028

Construction: Anticipated 2029


Check back for upcoming public information meetings and open house events.

  • Public & Stakeholder meetings

    July 27, 2022

    5:30 - 7:00 p.m.

    Jefferson High School
    1600 N Marion Road
    Sioux Falls, SD 57105

Past Event Materials

Public Meeting #1 (July 27, 2022)

View the meeting boards Watch the narrated presentation

The comment period for this meeting is open


Project Documents

Coming soon.

Previous Studies

SDDOT 2020 Decennial Study

Project Partners

South Dakota Department of Transportation
Sioux Falls Metropolitan Planning Organization
Minnehaha County, South Dakota
Sioux Falls, South Dakota
Crooks, South Dakota
Federal Highway Administration