Provincial police say it will likely take until Saturday afternoon to repair a washed out section of Highway 11 at North Bay.
The highway was damaged by record rainfall overnight in the city — and a rainfall warning remained in effect Friday, Environment Canada said.
"One side of the highway is gone with a washout. The northbound lanes are gone," OPP Inspector Mark Andrews told CBC News Sudbury's Morning North radio show.
"The crews are on the scene. They are working on it, trying to get it repaired, but the estimate at this point is 24 hours before that highway will be reopened."
Andrews said traffic on Hwy 11 was being rerouted through the Canadore College and Nipissing University campus.
Flood water also affected a couple of roads in Sudbury.
OPP said Hwy 537 through Wanup and Wahnapitae was closed.
The City of Sudbury said St. Cloud Road in Wanup was closed to through traffic, but open to residents and emergency vehicles.
Two roads were also closed in the Beaver Lake area, near Lively, due to flooding.
Worthington Road was closed between Hwy 17 west and Salo Road. Club Road was closed between Lorne Falls Road and Ella Road. Emergency vehicles and local traffic can access Club Road via Ella Road, however.
Rainfall warning lifted in Sudbury
Flood warnings continued Friday for the Sudbury and North Bay regions, but Environment Canada lifted the rainfall warning for Sudbury.
"We didn't receive the ultimate rain that we had predicted. So that was a little blessing in disguise for us," said Nick Benkovich, the director of water and wastewater services for Greater Sudbury.
"We were able to manage through the night relatively successfully."
Environment Canada said Sudbury received 26 mm of rain over the past 24 hours and North Bay received about 45 mm.
In North Bay, the area conservation authority said flooding was imminent or had already happened in some areas, including the Chippewa creek.
A spokesperson with the Nickel District Conservation Authority in Sudbury said the city's 3-1-1 number is currently staffed 24-hours-a-day to receive calls from anyone in need.
Paul Sajatovic said calls were coming in concerning "the ... saturated and frozen ground that we have and the snow melt and the run off that is ongoing."
He said there have been some reports of water in people's yards and washouts on some rural roads.
Sajatovic noted public safety remains the No. 1 concern for the city and reminded people to stay away from fast flowing water.
Goulais River a concern
The Ministry of Natural Resources has warned of dangerous conditions on the Goulais River.
Officials said some corners of the river are already starting to move more quickly.
Ongoing rainfall could suddenly break-up thick ice, which has the potential to create ice jams and flooding, they said.
According to a release from the MNR, people near the mouth of the Goulais River have reported it's still frozen, which means there could be a problem in the release of ice as it moves downstream.
People who live along the river have been advised to monitor the situation closely as the full impact of this weather might not be fully felt for another day or two.
Possible tornados north of Toronto
Two brief tornadoes may have touched the ground Thursday night in the Shelburne area, about 80 km northwest of Toronto.
Environment Canada reported it wasn't sure and sent a team to the area Friday to see if the damage was caused by strong wind or twisters.
The damage included the roof of a barn that was ripped off just northwest of Shelburne. The side of another barn was sheared off west of the community.
In East Gwillimbury, police said about 20 hydro poles were knocked down on Woodbine Avenue and the area was expected be closed to traffic for two or three days.