Alberta's Premier says a phased return of more than 80,000 residents of the fire-damaged oil sands city Fort McMurray will begin Wednesday as planned.

Rachel Notley said in a statement Tuesday that the wildfire is no longer an imminent threat to the city and critical infrastructure has been repaired. The massive wildfire destroyed about 2,400 structures almost a month ago in Fort McMurray but 90 percent of the city remains intact. Residents of three neighborhoods won't be able to return because of environmental concerns.

A boil water advisory remains in effect and many businesses will not be open. Notley urged residents to bring food, water and any other supplies needed for the next two weeks.

Schools will not be reopened until September.