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August 4 - 17, 2022 Construction Update
- Underground utility work is completed and grading operations are still underway on Marion Road, north of 41st Street
- The drainage ditch grading and paving work is completed on I-29 between 41st Street and 49th Street. Drainage work is underway between 49th Street and 57th Street.
- Marion Road between 41st Street and 39th Street is anticipated to reopen at the end of August.
- By the end of August, underground utility work, grading and paving will be completed along 41st Street between Marion Road and Madelyn Avenue.
- At the end of August, crews will start building retaining walls for the southbound I-29 on-ramp and southbound I-29 off-ramp toward 41st Street from I-29. This work is anticipated to last approximately six to eight weeks.
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)?
The DDI resembles a conventional diamond interchange. Drivers make right turns at a DDI just as they would at a regular diamond interchange. Drivers who want to turn left cross over to the left side of the road then make their left turn. Because traffic is on the left side of the road between the crossover points, all left turns occur without having to cross opposing traffic.
This animated video shows an overview of the 41st and I-29 project as well as how drivers will flow through the interchange from all directions of traffic.
Watch how a DDI works in real life.
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.
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South Side of 41st Street West of I-29 (2022)
South Side of 41st Street West of I-29 (2022)
Construction progresses on the south side of 41st Street west of I-29.
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Removals
In ProgressCompleted -
Sanitary Sewer
In ProgressCompleted -
Water Main
In ProgressCompleted -
Drainage
In ProgressCompleted -
Grading
In ProgressCompleted -
Gravel
In ProgressCompleted -
Concrete Paving
In ProgressCompleted -
Misc Concrete
In ProgressCompleted -
Restoration
In ProgressCompleted
Marion Road South of 41st Street (2022)
Construction progresses on Marion Road south of 41st Street.
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Removals
In ProgressCompleted -
Sanitary Sewer
In ProgressCompleted -
Water Main
In ProgressCompleted -
Drainage
In ProgressCompleted -
Grading
In ProgressCompleted -
Gravel
In ProgressCompleted -
Concrete Paving
In ProgressCompleted -
Misc Concrete
In ProgressCompleted -
Restoration
In ProgressCompleted
North Side of 41st Street West of I-29 (2022)
Construction progresses on the north side of 41st Street west of I-29.
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Removals
In ProgressCompleted -
Sanitary Sewer
In ProgressCompleted -
Water Main
In ProgressCompleted -
Drainage
In ProgressCompleted -
Grading
In ProgressCompleted -
Gravel
In ProgressCompleted -
Concrete Paving
In ProgressCompleted -
Misc Concrete
In ProgressCompleted -
Restoration
In ProgressCompleted
Marion Road North of 41st Street (2022)
Construction progresses on Marion Road north of 41st Street.
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Removals
In ProgressCompleted -
Sanitary Sewer
In ProgressCompleted -
Water Main
In ProgressCompleted -
Drainage
In ProgressCompleted -
Grading
In ProgressCompleted -
Gravel
In ProgressCompleted -
Concrete Paving
In ProgressCompleted -
Misc Concrete
In ProgressCompleted -
Restoration
In ProgressCompleted
I-29 Interchange Work (2022-2023)
Construction progresses on the new interchange.
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Removals
In ProgressCompleted -
Sanitary Sewer
In ProgressCompleted -
Water Main
In ProgressCompleted -
Drainage
In ProgressCompleted -
Grading
In ProgressCompleted -
Gravel
In ProgressCompleted -
Concrete Paving
In ProgressCompleted -
Misc Concrete
In ProgressCompleted -
Restoration
In ProgressCompleted
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 ProgressCompleted -
Sanitary Sewer
In ProgressCompleted -
Water Main
In ProgressCompleted -
Drainage
In ProgressCompleted -
Grading
In ProgressCompleted -
Gravel
In ProgressCompleted -
Concrete Paving
In ProgressCompleted -
Misc Concrete
In ProgressCompleted -
Restoration
In ProgressCompleted
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 ProgressCompleted -
Sanitary Sewer
In ProgressCompleted -
Water Main
In ProgressCompleted -
Drainage
In ProgressCompleted -
Grading
In ProgressCompleted -
Gravel
In ProgressCompleted -
Concrete Paving
In ProgressCompleted -
Misc Concrete
In ProgressCompleted -
Restoration
In ProgressCompleted
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April - November 2022
41st Street construction from Marion Road to Meadow Avenue (west half of project area)
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April - November 2023
41st Street construction from Meadow Avenue to Shirley Avenue (east half of project area)
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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.
