Overnight, thousands of firefighters made strides toward gaining the upper hand on the Rim Fire that now covers 149,780 acres of the Sierra foothills.
As of Monday morning, the giant blaze was 15 percent contained, up from 7 percent a day earlier.
However it still threatens 4,500 homes and is inching closer to the Hetch Hetchy Reservoir, which accounts for 85 percent of San Francisco’s drinking water.
Evacuation orders still remain in effect, and on Sunday crews continued to protect Twain Hart and Ponderosa Hills, two towns still miles ahead of the fire.
The Rim Fire, now 234 square miles, is the 13th largest fire in the state’s history.