41st Street Diverging Diamond Interchange

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41st Street and Marion Road

41st Street and I-29

41st Street and Marion Road

41st Street and I-29

Traffic Alerts

December 7, 2022

41st Street, Marion Road to I-29

Phase 1 construction of the 41st Street Diverging Diamond Interchange (DDI) project is complete. This project is nearly ten years in the making, as SDDOT and the City of Sioux Falls made plans to improve safety and enhance traffic operations in this area. The DDI was chosen because of its 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. Construction is scheduled to span from 2022 to 2024. Each year segmented its own phase of work.

In April 2022, Phase 1 construction of the project began. During Phase 1, a portion of 41st Street from Marion Road to Meadow Avenue underwent a series of upgrades and transformations that included:

  • Adding traffic lanes
  • Repaving traffic lanes
  • Updating underground utilities
  • Adding new sidewalks and accessible curb ramps
  • Installing new traffic signals and streetlights
  • Reinforcing the girders of the 41st Street bridge
  • Building retaining walls for southbound Interstate 29 on and off ramps

As construction work winds down for the winter, 41st Street is now fully reopened to motorists, but pedestrian traffic will still be limited to the south side of 41st Street when crossing Interstate 29. Pedestrians will need to cross to the south side of 41st Street, at either of the signalized intersections at Marion Road or Terry Avenue, as the sidewalks along the north side of the street east of Meadow Avenue will remain closed.

Phase 2

Spring 2023

Work on Phase 2 will begin in spring 2023, where crews will focus on the DDI bridge structure and updates to 41st Street from Carolyn Avenue to Shirley Avenue. During this time, there will be lane closures, but at least one lane of traffic will be open in each direction along 41st Street. Updates to be completed in Phase 2 include:

  • Updating and adding underground utilities
  • Installing new traffic signals and streetlights
  • Installing new medians
  • Adding new sidewalks and accessible curb ramps

The diverging diamond and construction along 41st Street is expected to finish around November 2023. This will allow the crew to focus on clean-up, finishing touches, and restoration in the spring of 2024.

While most of the construction is on hold for the winter, traffic signal work will continue at the Terry Avenue and 41st Street and the Shirley Avenue and 38th Street intersections. During this time the project’s bi-weekly newsletters and website project updates will be paused. Project announcements will be made as needed and regularly scheduled updates will resume in the spring, with the start of Phase 2 of construction.

Construction Progress

Construction began in early 2022 and is anticipated to be completed in summer 2024. The project is divided into two phases: west and east. The west half of the project area includes 41st Street from Marion Road to Meadow Avenue. The east half includes 41st Street from Meadow Avenue to Shirley Avenue.

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 (2022)

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

  • 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 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 (2022)

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

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

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

Construction has not started 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
? North Side of 41st Street East of I-29 (2023)

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

Construction has not started 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
? Signal and Sidewalk at 38th St.

Signal and Sidewalk at 38th St.

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

  • Removals

    In Progress
    Completed
  • Electric

    In Progress
    Completed
  • Sidewalk

    In Progress
    Completed
  • Traffic Signal

    In Progress
    Completed
  • Restoration

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

I-29 Interchange Bridge Work (2022-2023)

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

  • Girders

    In Progress
    Completed
  • Southside Removals

    In Progress
    Completed
  • Southside Rehab & New Construction

    In Progress
    Completed
  • Northside Removals

    In Progress
    Completed
  • Northside Rehab & New Construction

    In Progress
    Completed
  • Electrical

    In Progress
    Completed
  • Closure Pour

    In Progress
    Completed
  • Barriers

    In Progress
    Completed
  • Restoration

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

I-29 Southbound Interchange Work (2022-2023)

Construction is underway on the 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
? I-29 Northbound Interchange Work (2023)

I-29 Northbound Interchange Work (2023)

Construction has not started on the 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
  • 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