The blaze had grown to engulf an estimated 45 square kilometres of land near Norman Lake by Wednesday morning.
The fire has forced dozens of people from their homes since it was first discovered about 50 kilometres southwest of Prince George on Saturday.
More then 100 firefighters, numerous helicopters and heavy equipment crews have been working around the clock in attempt to get the blaze under control.
Another crew is taking measures to protect structures in the area from the threat of the fire, that is being fueled by dry conditions and wind.
Two regional districts have issued evacuation orders or alerts, while B.C. Parks has closed its Dahl Lake and Bobtail Mountain provincial parks until further notice.
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