Interstate 229 Exit 4 - Cliff Ave Reconstruction
Public Informational Meeting:
On Wednesday, April 9, 2025, from 5 p.m. - 6:30 p.m. at the Lincoln High School Front Lobby, the South Dakota Department of Transportation (SDDOT) will hold a public informational meeting to discuss the Interstate 229 Exit 4 - Cliff Avenue project in Sioux Falls.
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 Timeline:
Year One: July 2024 - December 2024
Year Two: Spring 2025 - Fall 2025
Year Three: Spring 2026 - June 2027
Project Updates:
April 7, 2025 - Press Release:
On Monday, April 14, 2025, a road closure is scheduled for East 41st Street from east of South Carter Place to South Cliff Avenue. Weather permitting, East 41st Street is scheduled to reopen in August 2025. During the closure, drivers should use Minnesota Avenue and 33rd Street as the detour route. The closure will include the installation of underground utilities. The street is being reconstructed to align with the Lincoln High School entrance as part of the Interstate 229 and exit 4 interchange project.
On Monday, April 14, 2025, and Tuesday, April 15, 2025, South Cliff Avenue will be closed nightly from 8 p.m. to 6 a.m. During the planned closures, crews will be removing the southbound I-229 bridge. This overnight work is anticipated to be complete by 6 a.m. on Wednesday, April 16, 2025. Drivers should plan to use exit 3 and exit 5 as detour routes. Motorists are reminded to use caution and reduce their speed while workers and equipment are present.
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April 4, 2025 - Press Release:
On Wednesday, April 9 and Thursday, April 10, 2025, a lane closure will be in place from 9 a.m. to 3 p.m. for the southbound passing lane on Interstate 229 between exit 4 (Cliff Avenue) and exit 5 (26th Street) in Sioux Falls. Xcel Energy will be pulling wire across I-229 for transmission lines.
This work is part of a larger project to reconstruct I-229 exit 4 as a single point urban interchange. Motorists are reminded to use caution and reduce their speed while workers and equipment are present.
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March 31, 2025 - Press Release:
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.
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Jan. 27, 2025:
Beginning the week of Monday, Feb. 3, 2025, Xcel Energy will be conducting utility work on the project. Plans for the scheduled work can be found here.
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Dec. 20, 2024:
Nov. 15, 2024 – Dec. 15, 2024, Completed Work: Deck panels and guardrail were installed on the temporary bridge. All guardrail along the I-229 northbound diversion has been installed. Topsoil, seed, and the erosion control blanket have been completed.
Anticipated work Dec. 15, 2024 – Jan. 15, 2025: Crews will install twelve new signs between exit 3 and 5. Pavement markings are the last remaining work item to be completed.
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Dec. 13, 2024 - Press Release:
Beginning on Monday, Dec. 16, 2024, a lane closure is planned for the inside northbound lane of Interstate 229 near exit 4 (Cliff Avenue). Crews will be installing a guardrail near the northbound bridge. Weather dependent, the lane will be reopened later in the day on Monday, Dec. 16, 2024.
Motorists should be prepared for delays and use alternate routes during peak travel times through the I-229 and Cliff Avenue construction project. Drivers are urged to use caution and reduce their speed while traveling through the area. Traffic control measures will continue to guide motorists around all closures.
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Dec. 12, 2024:
Nov. 15, 2024 – Dec. 15, 2024, Completed Work: Deck panels and guardrail were installed on the temporary bridge. All guardrail along the I229 northbound diversion has been installed. Topsoil, seed, and erosion control blanket have been completed.
Anticipated work Dec. 15, 2024 – Jan. 15, 2025: Crews will install new signs between Exits 3 & 5. Pavement markings are the last remaining work item to be completed.
Project Photos:
Project Contract Amount:
Year One: $5.6 Million
Year Two and Three: $48 Million
Project Contacts:
605-940-1000
Year One: Soukup Construction, Inc.
605-332-5282
Year Two and Three: T&R Contracting
