Authorities around British Columbia have been forced to close sections of highway because of avalanche control measures.

The Coquihalla and Highway 3 north of Hope are again open to traffic. However, Highway 1, the Trans-Canada, remains closed through the Fraser Canyon.

The road closures were announced Tuesday as Environment Canada issued snowfall warnings across southern B.C., noting accumulations were expected to surpass 20 centimetres in some areas.

According to DriveBC, the following sections of highway are closed because of a high avalanche hazard or heavy snowfall warnings:

  • Highway 1 four kilometers east of Yale.
  • Highway 1 at Jackass Mountain Summit.
  • Highway 1 at Glacier National Park.
  • Highway 1 27 kilometres west of Revelstoke to nine kilometers west of Revelstoke.
  • Highway 1 in Glacier National Park.
  • Highway 29 from north of Halfway River Bridge to Fort St. John.
  • Highway 31 12 kilometres north of Trout Lake.
  • Highway 40 from Gold Bridge to Mission Dam.

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Semis line up all over Hope as all three highways into the B.C. Interior are closed because of the avalanche risk. (Steve Lus/CBC)

Meanwhile, the Canadian Avalanche Centre is warning back country enthusiasts in the Columbia Mountains, Kootenay-Boundary and around Whistler to use extreme caution because of the high avalanche danger.

"We've got a lot of new snow and in some places it's rested on these layers we are concerned about," said forecaster Ilya Storm.

"For advanced users you can probably work around in the mountains fairly well as long as you stay to gentle terrain. If you have less training you may want to stay within ski area."