Lane Closures Ahead As I-229 Project Revamps Cliff Avenue

The arrival of spring is ushering in the start of road construction season in Sioux Falls.

According to the South Dakota Department of Transportation, beginning Monday (March 30), the ongoing interchange reconstruction project on Interstate 229 near Cliff Avenue (Exit 4) is scheduled to resume. Lane closures will be in place for southbound traffic to allow crews to install traffic control devices, concrete barriers, and pavement markings for two-way traffic in the southbound lanes. The lane closures will shift as contractors progress with installing the barriers and pavement markings.

Then, on April 6, northbound traffic on I-229 will be switched to the southbound lanes. At that time, the northbound on- and off-ramps at exit 4 will be closed. Drivers should use Exit 3 (Minnesota Avenue) and Exit 5 (26th Street) as detour routes to access Cliff Avenue south of I-229. Motorists are reminded to use caution and reduce their speed while workers and equipment are present.

READ MORE: New Interchange Construction Kicks Off In Sioux Falls

The $48 million project includes additional lighting, signals, and mainline Interstate work. The interchange will be reconstructed as a single-point urban interchange. The overall project includes two structure replacements. The southbound I-229 lanes and the first structure were constructed in 2025. The northbound I-229 lanes and the second structure are being reconstructed this year.

The overall project completion date is June 2027.

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