The fire on the west side of Harrison Lake started on Sunday afternoon and quickly grew, producing heavy smoke throughout the popular recreational area.
Campers at the Wood Lake and Twenty Mile Bay campgrounds have been evacuated as a precaution. The B.C. Wildfire Service said although the campgrounds aren't directly threatened, the fire has affected the only road leading in and out of the sites.
"This area is in high fire danger rating and this fire was human caused and preventable," said Donna MacPherson with the B.C. Wildfire Service.
"We need people to be a lot more vigilant when they're out there and realize that anything they do could cause a spark."
RCMP officers have blocked the West Harrison Lake Forest Service Road until further notice.
There are 43 firefighters battling the blaze, along with three helicopters.
The B.C. Wildfire Service says windy weather has created challenging conditions for fire crews.
On Sunday the B.C. Wildfire Service confirmed the Martin Mars water bomber and other water tankers have been deployed to fight the fire.