Wildfires burning uncontrolled across the region include 433 in British Columbia and 176 in Alberta, more than a dozen of them in the area of Fort McMurray, an oil sands hub.

The pipeline, which can carry 890,000 barrels per day (bpd) of oil from Edmonton to Vancouver, runs through a national park in the Canadian Rockies near the picturesque tourist town, from which about 25,000 people were forced to evacuate on Tuesday.

"Firefighters ... are working to save as many structures as possible and protect critical infrastructure, including the wastewater treatment plant, communications facilities, the Trans Mountain Pipeline," Parks Canada said in a post on Facebook.

The pipeline operator did not immediately respond to a Reuters request for comment, but said earlier it was safely operating the pipeline and had deployed sprinkler protection as a preventive measure.