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

Comments will be accepted for 14 calendar days after the meeting date. All written comments received for this public meeting (during the advertised timeframe) will be summarized and publicly shared. Names and addresses will not be released nor shared throughout this process. The summary document of written comments received will be located on the public meeting website page following the conclusion of the written comment period.

Disclaimer: Email addresses and phone numbers will never be sold or used in any manner not related to the project for which this information is being provided.

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 (Recommended Alternative): Standard Diamond Interchange

Option 2: Single Point Urban Exchange

Option 3: Diverging Diamond Interchange

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

Map showing the study area at Exit 86 on Interstate 29 near Sioux Falls, South Dakota. Labels mark Crooks to the northwest, Renner to the east, and Sioux Falls to the south. A callout box highlights an aerial view of the Exit 86 interchange and surrounding commercial and agricultural land.
Click to enlarge.

Timeline

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.

Project timeline graphic showing sequential phases from left to right: Data Collection and Analysis; Develop and Refine Build Options; Draft IMJR and Draft ESR; Submit Final IMJR and Submit Final ESR; Draft NEPA; and Submit Final NEPA. Two milestones labeled “Public & Stakeholder Meetings” appear above the timeline, positioned early and mid process.

Outreach

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

Resources

Updated project documents coming soon.

Previous Studies

SDDOT 2020 Decennial Study

Past Event Materials

Public Meeting #2 (January 15, 2025)
View the meeting boards Watch the narrated presentation
Public Meeting #1 (July 27, 2022)
View the meeting boards View the narrated presentation

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