As fire crews continue to battle the Gutlzer fire, which flared up on Sunday, the blaze has grown to 850 acres as of Wednesday, authorities say.
Crews mapped the fire burning southwest of Kremmling with aircraft and found the blaze had grown 550 acres since Tuesday.
The air attack continues on the fire, which is burning a combination of mixed conifer and beetle kill just above a private ranch in the White River National Forest.
Fire crews put in 3/4 of a suppression line at the southwestern flank of the fire and are expected to finish up the line, which has been put in line with natural barriers where possible, Wednesday evening, the Eagle County Sheriff's Office says.
As of Wednesday afternoon, no evacuations or official road closures are in place, though some campers near Forest Service Road 402 and Sheephorn Creek Road have been asked to leave.
Firefighters are monitoring a home and several ranch structures a mile east of the blaze.
A hot and dry forecast with gusty winds may hinder firefighting efforts, the Upper Colorado River Fire and Aviation Management Unit said in a news release.
Smoke from the fire may be visible in Vail and other parts of Eagle County, as well as the Green Mountain Reservoir area.
Eight smokejumpers, one type three helicopter, two single engine air tankers and two engines are battling the blaze.