Crews are still working around the clock to plow and salt roads and haul away massive loads of snow from Pittsburgh’s streets, Mayor Corey O’Connor said Wednesday afternoon.

About a foot of snow pummeled Pittsburgh on Sunday, marking the snowiest day the city had seen in 16 years.

O’Connor in the aftermath was forced to declare a state of emergency after dozens of plows broke down. Some roads remained snowy and covered in ice even days later.

“We know the job is nowhere near done,” O’Connor said.

The city will deploy 47 of its trucks overnight Wednesday into Thursday, along with dozens more provided by independent contractors Pittsburgh called in for help.

“They’re still working around the clock the next few days,” the mayor said.

O’Connor said officials are also considering whether they can seek assistance from other road crews.

Some of those contractors are focused not just on plowing, but also hauling away the giant snow banks that are blocking parking spots and making intersections tricky to navigate. Crews have already removed more than 10,000 tons of snow from roads, heaping the accumulation up at sites throughout the city, O’Connor said.

The mayor told reporters he had been fielding calls to the city’s non-emergency 311 line himself Wednesday afternoon when it was backlogged by people reporting poor road conditions.

Snow still sitting on roads is starting to freeze up in the frigid temperatures, O’Connor said. With no expectations of the weather to warm soon, crews are putting down as much salt as they can.

Earlier in the week, 37 city trucks broke down during one overnight shift. Of those, 27 have since been repaired and are back in service, the mayor said.

Most main roads and business districts “seem pretty good,” O’Connor said, though some two-lane stretches may currently be restricted to one because of snowy conditions. The city is prioritizing the gaps throughout the city that have yet to be plowed out, as well as areas that have seen significant snowbanks piling up near business districts and intersections.

Pittsburgh on Thursday will open warming centers from 8 a.m. until 6 p.m. at Beechview, Greenfield, Homewood and Sheraden healthy active living community centers.

“We need to just continue to do what we’re doing,” O’Connor said, “one day at a time, one hour at a time.”