Interstate 229 Exit 4 - Cliff Ave Reconstruction
Project Summary:
Years Two and Three: The project includes the reconstruction of exit 4 (Cliff Avenue) with added lighting, signals, and mainline Interstate work. The Interchange will be reconstructed as a Single Point Urban Interchange. This project includes two structure replacements. 41st Street will be realigned to intersect with the Lincoln High School entrance. Traffic signals will be added to the intersection of Cliff Avenue & 38th Street. Pedestrian mobility will be improved with a new trail, sidewalk, and access tunnels. The southbound I-229 lanes and structure will be constructed in 2025 and the northbound I-229 lanes and structure will be constructed in 2026.
Year One: This project includes the modification of the median crossovers with a temporary structure in preparation for the 2025 interchange reconstruction. This project also includes the temporary widening of Interstate 229 northbound.
Find information on the project study here: https://www.i229exits3and4.com/
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Project Updates:
March 24, 2026:
The interchange reconstruction project on Interstate 229 near Cliff Avenue (exit 4) is scheduled to resume in Sioux Falls. Beginning Monday, March 30, 2026, lane closures will be in place for southbound traffic on I-229 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.
On Monday, April 6, 2026, 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.
This interchange reconstruction 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.
March 23, 2026:
On Wednesday, March 25, 2026, lane closures will be in place from 8:30 a.m. to 4:30 p.m. for the southbound inside lane and auxiliary lane on Interstate 229 between exit 4 (Cliff Avenue) and exit 3 (Minnesota Avenue). A contractor will be installing a cantilever sign. Motorists are reminded to use caution and reduce their speed while workers and equipment are present.
Detour Route:
