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I-90: Kellogg Dips

After surveys and several rounds of temporary repairs, the final fix will be constructed in fall 2021.

History and long-term repairs

Four locations on Interstate 90 began to sink in February 2019, and since then, ITD has partnered with several agencies, including the Environmental Protection Agency, to determine the cause and prepare a permanent fix.

In the following months, ITD lowered the speed limit as necessary and twice added more pavement to keep the roadway surface level and increase speeds.

The cause of the settlement remains unknown, but with the completion of the EPA facility adjacent to the freeway in late summer 2020 and the forming of another dip in the westbound lanes, ITD continued to monitor the area to assess the need for emergency repairs in fall 2020 or spring 2021.

Monitoring showed no further settlement, so final repairs are scheduled in fall of 2021.

Final repairs start in mid-September
August 2021

New dip forms

A new dip has formed in the westbound lanes just east of the previous dips. At this time ITD is not expecting to lower the speed limit, but now that the EPA has finished the facility adjacent to the freeway, both agencies will continue to monitor the area to determine the need for short-term repairs and plan for any long-term repairs. Another layer of pavement could be added this fall or next spring if the settlement worsens.

July 2019

Monitoring continues

Settlement monitoring continues while the EPA completes work on their facility adjacent to the freeway. The EPA project is scheduled for completion by the spring, allowing further investigation into the cause of the issue. The presence of any activity next spring will help determine the scope and timing of a permanent fix. Repairs could take place summer 2020 or the following year.

April 2019

Site drilling

Drilling will help develop permanent repairs by collecting road data. Drivers can expect a single-lane closure on eastbound I-90 during drilling operations.

March 2019

Temporary Repairs

Another round of temporary repairs is scheduled for Friday, March 29. Drivers can expect single-lane closures during the day while crews are on site.

Repairs schedule
March 2019

Dips are stabilizing

Survey results show that the dips are not settling as quickly. Another round of temporary repairs and more drilling are expected in April.


The final fix will be constructed in September of 2021. Repairs call for the pavement in the median to be removed, the base to be built back up and paved again. All lanes between the two settling sections will also be repaved to provide for a smooth surface. Read more.

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