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By Phil Helsel

California firefighters have made progress in fighting a large wildfire west of Sacramento that has scorched 6,900 acres, officials said.

The so-called Wragg Fire was 55 percent contained by Saturday, three days after it broke out in steep and rugged terrain in Napa and Solano counties, the California Department of Forestry and Fire Protection said.

The fire destroyed one outbuilding and a tent trailer, and damaged another structure. Some 140 structures are threatened, fire officials said. All mandatory evacuation orders were lifted by Saturday. Napa County is known as wine country, but no wineries were threatened, officials have said.

PHOTOS: Wragg Fire Wreaks Havoc on California Wine Country

More than 1,800 firefighters were battling the Wragg Fire, and 13 helicopters were being used in the effort, the department, also known as Cal Fire, said Saturday.

California is in its fourth year of a historic drought, exacerbating wildfire conditions.

Through July 18 of this year there have been more than 1,000 additional fires in California than in the same period last year, Cal Fire said — although the acres that have burned is lower, with 18,874 acres being burned in 2015 compared to 35,567 through July 18 of last year.

On Tuesday, firefighters declared the North Fire, which was fueled by high winds in the Cajon Pass east of Los Angeles and torched vehicles on an interstate, 100 percent contained.

The fire burned 18 vehicles and two big rigs on Interstate 15, the main highway from Los Angeles to Las Vegas, and destroyed 44 vehicles overall. Seven homes were also destroyed. Aerial firefighting efforts were delayed by about 20 minutes after the fire broke out July 17 by drones in the area, fire officials said.

In Montana, a wildfire is still burning in Glacier National Park. The Reynolds Creek Fire is up to 3,166 acres and is 10 percent contained, the U.S. Forest Service said.

The fire, which broke out Tuesday, prompted parts of the park to be evacuated on Wednesday, but the Forest Service said the majority of the massive park remains unaffected.