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The Sacramento Bee, Randall Benton, Associated Press
A US Forest Service crew from Plumas County cleans up along Wentworth Springs Road near Uncle Tom's Cabin in El Dorado County on Thursday, Sept. 18, 2014. The King fire has burned over 70,000 acres.

SACRAMENTO, Calif. — Nearly an inch of rain, with more wet weather forecast for the weekend, is helping firefighters gain the upper hand on a massive wildfire burning in the mountains east of Sacramento.

The fire, which authorities say was started by an arsonist amid extraordinarily dry conditions two weeks ago, was 68 percent contained Friday. Firefighters took advantage of lower temperatures, higher humidity and the steady rain that fell a day earlier.

It has burned more than 150 square miles of a heavily forested region of the Sierra Nevada that is home to numerous hydroelectric plants and is crisscrossed with power lines, water pipes and wooden flumes.

While the King Fire destroyed a dozen homes, most of the utility infrastructure appears to have been spared, as was a popular lakes basin.