Crews working to repair cavity underneath northern Alberta highway

Highway 63 near Mildred Lake, Alta. on Dec. 18, 2025. (Source: Alberta 511)

Drivers using Highway 63 north of Mildred Lake should expect delays as crews repair a cavity beneath the roadway.

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The province says the cavity was discovered under the stretch of the highway just south of the Fort McKay intersection.

The speed limit has been reduced to 50 km/h and traffic has been reduced to one lane in each direction during non-peak hours while crews inspect the cavity and work on repairs.

Overweight vehicles will not be allowed to drive over that section of the highway until repairs are completed.

The work to fill the cavity is expected to take five to seven days to complete.