Cliff Avenue Interchange Fully Opens to Traffic November 20

All lanes and ramps at the Cliff Avenue I-229 interchange in Sioux Falls will open November 20 as construction wraps for the year.

Updated on Nov. 5, 2026 in Openings & Closings

Elevated view of a newly completed urban highway interchange with curving empty asphalt ramps across flat prairie under low autumn sun. — The City of Sioux Falls will fully open all lanes and ramps at the Cliff Avenue I-229 interchange on November 20 as the nearly $50 million project wraps for the year. AI Illustration. Upload story photo >

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The City of Sioux Falls says all lanes and ramps at the Cliff Avenue I-229 interchange will open November 20. Single lanes on Cliff Avenue will expand to two lanes in each direction in about two-and-a-half weeks.

Why it matters

The nearly $50 million project is reaching its final traffic configuration before winter, easing congestion for Sioux Falls drivers who use the interstate corridor. Some traffic from the upcoming Minnesota Avenue reconstruction is expected to shift onto Cliff Avenue.

The Cliff Avenue I-229 interchange project cost nearly $50 million, and the city's schedule calls for all lanes and ramps to open November 20. Full traffic impacts from the Minnesota Avenue detour remain unmeasured.

The players

City of Sioux Falls

The city government of Sioux Falls, South Dakota, oversees street construction and traffic planning within the city's boundaries.

The details

The interchange is a single-point urban design, and the city coordinated stoplights north of the interstate to improve flow near the high school. Work resumes in spring with installation of a sign bridge and pavement markings.

November 20, 2026: All lanes and ramps at the Cliff Avenue I-229 interchange open.
In about two-and-a-half weeks: Single lanes on Cliff Avenue expand to two in each direction.
Spring 2027: Interchange work resumes with sign bridge and pavement markings.
2028: Crews begin rebuilding the Minnesota Avenue interchange.

Openings & Closings

The Cliff Avenue interchange completion sits within the city's phased sequence, with Minnesota Avenue scheduled for reconstruction beginning in 2028. The sequencing means Cliff Avenue will absorb some diverted Minnesota Avenue traffic during that later project.

Drivers using the Cliff Avenue I-229 interchange will have full access to all lanes and ramps starting November 20. Commuters should expect the lane expansion on Cliff Avenue in late November and further construction again in spring.

The takeaway

Plan commutes around the November 20 reopening and the lane expansion that follows, since the Minnesota Avenue rebuild will push more traffic onto Cliff Avenue in 2028.

What happens next

All lanes and ramps open November 20, 2026, and single lanes on Cliff Avenue expand to two per direction about two-and-a-half weeks after the announcement. Interchange work resumes in spring 2027, and the Minnesota Avenue interchange rebuild begins in 2028.