The wildfire burning just west of Fort Collins, Colo., has grown to nearly 50,000 acres, officials said.
Bill Hahnenberg, the incident commander of the team managing the so-called High Park Fire, told reporters Thursday the blaze is only 10 percent contained and 1,263 personnel are currently battling the flames.
Hahnenberg said the fire is continuing to spread on its western edge, but crews have successfully fought hotspots on its eastern side, keeping it away from Fort Collins, the fourth most populous city in Colorado.
The fire, which started early Saturday, has scorched more than 100 buildings and taken the life of a woman who remained in her mountain home despite evacuation orders. Linda Steadman, 62, was confirmed dead Monday.
The blaze is the third-largest wildfire in Colorado history.