Sioux Falls Will Reopen I-229 Ramp on September 24

The I-229 northbound off-ramp at Cliff Avenue will reopen to traffic following recent reconstruction work.

Updated on Sept. 23, 2026 in Construction

A freshly paved, empty highway ramp with concrete barriers viewed in bright daylight, representing the completion of infrastructure reconstruction. — The South Dakota Department of Transportation will reopen the I-229 northbound off-ramp at Cliff Avenue in Sioux Falls on September 24. AI Illustration. Upload story photo >

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The South Dakota Department of Transportation announced that the I-229 northbound off-ramp at Cliff Avenue will reopen on September 24. While the exit is now accessible, drivers are limited to right turns onto Cliff Avenue.

Why it matters

The ramp reopening marks progress in a large-scale infrastructure initiative intended to modernize the regional interchange. Continued construction in the surrounding area remains necessary to meet the project's long-term objectives.

The total interchange reconstruction is valued at $48 million. Southbound I-229 traffic currently operates within a two-lane configuration.

The players

South Dakota Department of Transportation

This state agency is responsible for the planning, construction, and maintenance of the transportation infrastructure throughout South Dakota.

The details

Reconstruction of the northbound auxiliary lane and ramp has been completed to allow for the scheduled reopening. Other segments of the site, including the northbound mainline Interstate and the Cliff Avenue on-ramp, will remain closed to commuters.

September 24, 2026: Reopening of I-229 northbound off-ramp at Cliff Avenue.
Late October 2026: Expected completion of Cliff Avenue paving.
Late November 2026: Northbound mainline and on-ramp work completion.
Early December 2026: Southbound I-229 pavement restriping completion.
June 2027: Overall project completion.

Market Landscape

The $48 million project follows the funding patterns established by the Infrastructure Investment and Jobs Act. Large-scale regional infrastructure upgrades reflect a broader industry trend toward long-term modernization of aging highway interchanges.

Drivers in Sioux Falls can utilize the I-229 northbound off-ramp starting September 24, though they must turn right onto Cliff Avenue. Commuters should remain aware that the northbound mainline Interstate and the on-ramp will stay closed until later this year.

The takeaway

Ongoing construction projects often involve shifting traffic patterns that require patience and attention to signage. Residents should plan for localized delays until the total interchange project reaches its final completion in 2027.