41st Street Diverging Diamond Interchange

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41th Street Diverging Diamond Interchange

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December 6, 2022 Construction Update

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.

Read the full update

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)?

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

 

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.