I-29 - Exit 71 InterchangeINTERCHANGE MODIFICATION STUDY

About

INCREASING TRAFFIC IN SIOUX FALLS METROPOLITAN AREA

Due to anticipated growth and increasing traffic volumes in the southern Sioux Falls metropolitan area, the SDDOT plans to reconstruct the existing I-29 Exit 71 interchange as part of an anticipated 2028 construction project. Three interchange types have been carried forward from the I-29 Exit 62 to 73 Corridor Study completed in 2018:

  • Compressed diamond interchange
  • Single point interchange (SPI)
  • Diverging diamond interchange (DDI)

The planned 2028 project will also reconstruct I-29 mainline to a 6-lane section (3 lanes in each direction) between I-29 Exit 71 and 73. The southern limits of this 6-lane reconstruction will be determined as part of the study.

The study is a collaborative effort between the South Dakota Department of Transportation (SDDOT), Federal Highway Administration (FHWA), Sioux Falls Metropolitan Planning Organization (MPO), Lincoln County, City of Tea, and City of Harrisburg.

TIMELINE TO CONSTRUCTION

The first step of the process towards construction is the interchange and environmental study, culminating with an Interchange Modification Justification Report (IMJR) and environmental document for SDDOT to submit to FHWA. Following concurrence of the proposed modifications by FHWA, the project will move into design.

  • Interchange Study: through end of 2021
  • Environmental Study (*NEPA): up to October 2022
  • Design: 2023 - 2028

*National Environmental Policy Act (NEPA) of 1969
NEPA and Project Development Overview

This study is a collaborative effort between the SDDOT stakeholders, and the public to develop a comprehensive plan for the corridor.
South Dakota DOT FHWA Logo MPO Sioux Falls Lincoln County, SD City of Tea, a growing tradition City of Harrisburg

STUDY AREA MAP

Click to enlarge the Study Area Map below.


map of SDDOT project between 271st and 273rd street

Events

PUBLIC INFORMATION MEETINGS

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

Public Information/Open House #2

Tuesday, November 30, 2021
5:30-7 PM
Tea City Hall (Council Room)
600 1st St
Tea, SD 57064

Public Meeting/Open House #1

The comment period for this meeting has ended.

VIEW ONLINE MEETING MATERIALS

Schedule

Click to enlarge

The study schedule shows the anticipated pace of the project. Data collection and analysis will take place from February 2021 to August 2021 with Public Meeting #1 taking place on Monday, August 23, 2021. The interchange alternatives will be refined and evaluated from August 2021 to September 2021 with Public Meeting #2 taking place shortly after this process is completed. The IMJR will be developed, reviewed, and revised in October through December of 2021. The final IMJR will be submitted in January 2022. An environmental scan will be conducted from February 2021 to January 2022 with an environmental report being prepared from January 2022 to October 2022.

Resources

DOCUMENTS AND PAST MEETING MATERIALS

Comment

TELL US WHAT YOU THINK

You can send the study team comments, questions, or recommendations throughout the study.

Contact

USE THE COMMENT FORM BELOW OR CONTACT PROJECT MANAGEMENT WITH QUESTIONS

Steven Gramm, P.E.

SDDOT Project Manager
(605) 773-6641
steve.gramm@state.sd.us

Jon Wiegand, P.E., P.T.O.E.

Consultant Project Manager
(605) 782-8105
jonathan.wiegand@hdrinc.com

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