ITD continues to monitor any settlement and work with EPA to investigate the cause of the issue before designing permanent repairs.
Repairing the depressions will ensure the integrity of the road base underneath.
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.
Permanent repairs could be constructed once water underneath the route stops washing sediments away, though no date is set as the cause of the issue remains unknown. In the meantime, crews will continue to monitor the area, collect survey data and add asphalt as needed to maintain a level surface for drivers.
Drilling will help develop permanent repairs by collecting road data. Drivers can expect a single-lane closure on eastbound I-90 during drilling operations.
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
Survey results show that the dips are not settling as quickly. Another round of temporary repairs and more drilling are expected in April.
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.