41st Street Diverging Diamond Interchange

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41th Street Diverging Diamond Interchange

Construction Complete!

How to Navigate the DDI


 

7/2/2024

The interchange is now a fully operational Diverging Diamond Interchange (DDI), with all lanes of traffic open. This project was developed through the coordinated efforts of the South Dakota Department of Transportation, the City of Sioux Falls, and the South Dakota Division Office of the Federal Highway Administration.

Federal, state, and local leaders celebrated the completion of the Interstate 29 and 41st Street DDI in Sioux Falls on Tuesday, July 2, 2024. Honored guests who participated in the media presentation/ribbon cutting event included:

  • U.S. Rep. Dusty Johnson
  • Sioux Falls Mayor Paul TenHaken and City of Sioux Falls Public Works Director, Mark Cotter
  • SDDOT Secretary of Transportation Joel Jundt
  • U.S. Senator John Thune - staff member, Benjamin Ready
  • U.S. Senator Mike Rounds - staff member, Keith Moore
  • Sioux Falls city elected officials, state officials, state legislators, members of the Transportation Commission, and 41st Street project planning and operations/contractor team members

Ribbon Cutting Event

Click on the images to enlarge.


People cutting a ribbon.
People standing in front of new interchange.
Speaker at a podium.
People standing in front of new interchange.

Construction Progress

Construction began in early 2022 and was completed in July 2024.

Click or tap on the dots to see more detail about a particular area.

Project overview map Completed South Side of 41st Street West of I-29 (2022)

South Side of 41st Street West of I-29 (2022)

Construction is complete on the south side of 41st Street west of I-29.

  • Removals

    In Progress
    Completed

  • Sanitary Sewer

    In Progress
    Completed

  • Water Main

    In Progress
    Completed

  • Drainage

    In Progress
    Completed

  • Grading

    In Progress
    Completed

  • Gravel

    In Progress
    Completed

  • Concrete Paving

    In Progress
    Completed

  • Misc Concrete

    In Progress
    Completed

  • Restoration

    In Progress
    Completed
Completed Marion Road South of 41st Street (2022)

Marion Road South of 41st Street (COMPLETE)

Construction is complete on Marion Road south of 41st Street.

Completed North Side of 41st Street West of I-29 (2022)

North Side of 41st Street West of I-29 (2022)

Construction is complete on the north side of 41st Street west of I-29.

  • Removals

    In Progress
    Completed

  • Sanitary Sewer

    In Progress
    Completed

  • Water Main

    In Progress
    Completed

  • Drainage

    In Progress
    Completed

  • Grading

    In Progress
    Completed

  • Gravel

    In Progress
    Completed

  • Concrete Paving

    In Progress
    Completed

  • Misc Concrete

    In Progress
    Completed

  • Restoration

    In Progress
    Completed
Completed Marion Road North of 41st Street (2022)

Marion Road North of 41st Street (COMPLETE)

Construction is complete on Marion Road north of 41st Street.

Completed South Side of 41st Street East of I-29 (2023)

South Side of 41st Street East of I-29 (2023)

Construction is complete on the south side of 41st Street east of I-29.

  • Removals

    In Progress
    Completed

  • Sanitary Sewer

    In Progress
    Completed

  • Water Main

    In Progress
    Completed

  • Drainage

    In Progress
    Completed

  • Grading

    In Progress
    Completed

  • Gravel

    In Progress
    Completed

  • Concrete Paving

    In Progress
    Completed

  • Misc Concrete

    In Progress
    Completed

  • Restoration

    In Progress
    Completed
Completed North Side of 41st Street East of I-29 (2023)

North Side of 41st Street East of I-29 (2023)

Construction is copmlete on the north side of 41st Street east of I-29.

  • Removals

    In Progress
    Completed

  • Sanitary Sewer

    In Progress
    Completed

  • Water Main

    In Progress
    Completed

  • Drainage

    In Progress
    Completed

  • Grading

    In Progress
    Completed

  • Gravel

    In Progress
    Completed

  • Concrete Paving

    In Progress
    Completed

  • Misc Concrete

    In Progress
    Completed

  • Restoration

    In Progress
    Completed
Completed Signal and Sidewalk at 38th St.

Signal and Sidewalk at 38th St. (COMPLETE)

Construction at the intersection of 38th Street and Shirley Avenue is complete.

Completed I-29 Interchange Bridge Work (2024)

I-29 Interchange Bridge Work (2024)

Construction is complete on the I-29 bridge and interchange.

  • Removals

    In Progress
    Completed

  • Barrier Walls

    In Progress
    Completed

  • Drainage

    In Progress
    Completed

  • Electrical

    In Progress
    Completed

  • Concrete

    In Progress
    Completed

  • Restoration

    In Progress
    Completed
Completed I-29 Southbound Interchange Work (2022-2023)

I-29 Southbound Interchange Work (2022-2023)

Construction is complete on the Southbound I-29 interchange.

  • Removals

    In Progress
    Completed

  • Drainage & Sanitary Improvements

    In Progress
    Completed

  • Retaining Walls

    In Progress
    Completed

  • Winterize

    In Progress
    Completed

  • Removals

    In Progress
    Completed

  • West 41st off Ramp & I-29 West on Ramp

    In Progress
    Completed

  • Drainage & Sanitary Improvements

    In Progress
    Completed

  • East 41st St off Ramp & I-29 East on Ramp

    In Progress
    Completed

  • Electrical

    In Progress
    Completed

  • Medians

    In Progress
    Completed

  • Restoration

    In Progress
    Completed
Completed I-29 Northbound Interchange Work (2023)

I-29 Northbound Interchange Work (2023)

Construction is complete on the Northbound I-29 interchange.

  • Removals

    In Progress
    Completed

  • Drainage & Sanitary Improvements

    In Progress
    Completed

  • Retaining Walls

    In Progress
    Completed

  • East 41st St off Ramp & I-29 East on Ramp

    In Progress
    Completed

  • West 41st St off Ramp & I-29 West on Ramp

    In Progress
    Completed

  • Electrical

    In Progress
    Completed

  • Medians

    In Progress
    Completed

  • Restoration

    In Progress
    Completed
Completed South side of 41st Street, East of I-29 (2024)

South side of 41st Street, East of I-29 (2024)

Construction is complete on the south side of 41st Street, east of I-29.

  • Removals

    In Progress
    Completed

  • Drainage

    In Progress
    Completed

  • Electrical

    In Progress
    Completed

  • Concrete

    In Progress
    Completed

  • Restoration

    In Progress
    Completed
Completed North side of 41st Street, West of I-29 (2024)

North side of 41st Street, West of I-29 (2024)

Construction is in progress on the north side of 41st Street, west of I-29.

  • Removals

    In Progress
    Completed

  • Drainage

    In Progress
    Completed

  • Electrical

    In Progress
    Completed

  • Concrete

    In Progress
    Completed

  • Restoration

    In Progress
    Completed
Completed Carolyn Avenue (2024)

Carolyn Avenue (2024)

Construction is complete on Carolyn Avenue.

  • Retaining Walls

    In Progress
    Completed

  • Electrical

    In Progress
    Completed

  • Paving

    In Progress
    Completed

  • Restoration

    In Progress
    Completed

  • April - November 2022

    41st Street construction from Marion Road to Meadow Avenue (west half of project area)

  • April - November 2023

    41st Street construction from Meadow Avenue to Shirley Avenue (east half of project area)

  • April - June 2024

    Finishing touches and clean-up; complete construction

 

We're making this as smooth as possible.

  • 41st Street will have one lane in each direction that remains open to traffic at all times.
  • Monitoring 41st Street intersections with live cameras and making signal adjustments in “real-time”.
  • Adjusting signal timings on alternate routes to compensate for additional traffic.
  • Keeping alternate routes free from construction.

A safer route for you.

SDDOT and the City of Sioux Falls are constructing a new diverging diamond interchange as the safest option for the most heavily traveled street in Sioux Falls and the state of South Dakota.

The diverging diamond was chosen because of the safety features, greater capacity and efficiency that it provides for the traveling public, it reduces the conflict of left-hand turn movements and meets the needs of all road users to accommodate large trucks, pedestrians and bicyclists.

What is a diverging diamond interchange (DDI)?