Work Scheduled to Begin on Interstate 229 at Cliff Avenue (Exit 4) in Sioux Falls

For Immediate Release:
Monday, March 31, 2025

Contact:
Mike Schmidt, Project Engineer, 605-941-1000

SIOUX FALLS, S.D. - On Monday, April 7, 2025, interchange reconstruction work is scheduled to begin on Interstate 229 near exit 4 (Cliff Avenue) in Sioux Falls. The project includes additional lighting, signals, and mainline Interstate work. The interchange will be reconstructed as a single point urban interchange. This project also includes two structure replacements. The southbound I-229 lanes and one structure will be constructed in 2025. The northbound I-229 lanes and the second structure will be constructed in 2026.

Beginning Monday, April 7, 2025, northbound traffic on I-229 will be diverted onto the northbound diversion and temporary bridge. During the first full week of April, motorists should plan for nighttime lane closures to allow crews to install traffic control devices, concrete barriers, and pavement markings along northbound I-229. The nighttime closures will be in place from 8 p.m. to 6 a.m.

Beginning Monday, April 14, 2025, southbound traffic on I-229 will be switched to the northbound lanes. At this time, the southbound on and off-ramps at exit 4 will be closed for construction. Drivers should use exit 3 and exit 5 as detour routes to access Cliff Avenue north of I-229. Motorists are reminded to use caution and reduce their speed while workers and equipment are present.

The prime contractor on this $48 million project is T&R Contracting, Inc. of Sioux Falls, SD. The overall completion date is June 2027. 

Featured Project Information:
Find additional information about this project on the SDDOT website at https://dot.sd.gov/i229exit4.

Sign Up for Text Notifications: 
For updates on MAJOR traffic changes on this reconstruction project, subscribe to a free text-in service. To subscribe, simply text "I229Exit4" to 605-566-4041. Subscribers can unsubscribe at any time.  

About SDDOT:
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For the latest on road and weather conditions, road closures, construction work zones, commercial vehicle restrictions, and traffic incidents, please visit https://sd511.org or dial 511.

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