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The blaze, about 120 miles north of Sacramento, has consumed more than 79 square miles and was threatening about 900 homes. It was 37 percent contained.

Elsewhere in California, a wildfire in Lassen Volcanic National Park was 65 percent contained after consuming more than 43 square miles. Officials expected firefighters would have the blaze contained by Tuesday.

In Mendocino County, a wildfire that started Saturday had consumed about 9 square miles. That blaze was sparked by lightning and was burning in a remote area of thick timber and rugged terrain, making it difficult for fire crews to access.

In Idaho, firefighters dug in to defend the town of Featherville against the raging Trinity Ridge Fire that has chewed through more than 141 square miles in the central region of the state. Flames had yet to reach Featherville, which has been evacuated. But if they do, firefighters said they were ready with a planned burnout operation intended to slow the blaze.

A little to the north, Idaho’s largest wildfire, the Halstead Fire, which was ignited by lightning in late July, had burned 143 square miles.

In Washington state, firefighters hoped to fully contain a wildfire that burned dozens of homes in Cle Elum, about 75 miles east of Seattle. Crews across the state expected thunderstorms that could bring moisture along with the possibility of lightning and additional fires.

The fire broke out a week ago at a bridge construction project and has burned nearly 36 square miles of grass, sagebrush and timber in rural areas. Most of Eastern Washington was under a fire watch Monday due to high temperatures and low humidity.

Smaller fires were burning in Colorado and Utah after being sparked by lightning over the weekend.

Collins reported from San Francisco. Associated Press writers John S. Marshall in San Francisco, Lynn DeBruin in Salt Lake City, Shannon Dininny in Yakima, Wash., and Jessie Bonner in Boise, Idaho, contributed to this report.