The fire started after a lightning strike and has destroyed thousands of acres of rugged terrain.
Crews say the steep slopes, limited road access and a high number of dead trees, up to 70% bug-killed timber in some areas, make the fight even more challenging.
"We have a little bit of a window right now, so we're definitely taking advantage of that," said Adrienne Freeman, a spokesperson for the U.S. Forest Service.
About 1,000 firefighters from across the country are working to contain the fire.
Behind the scenes, hundreds more are making sure those crews have what they need to stay in the fight.
At Avocado Lake Park, a quiet recreation area has been transformed into a small city to support the firefighting effort.
Crews there prepare thousands of meals each day, from hot breakfasts to sack lunches, to keep firefighters fueled.
"Lots of nutrients and protein go into these things daily," one food service worker said.
Logistics teams also provide showers, laundry and sanitation services to ensure firefighters can focus on the front lines.
"Logistically, there's no way to be as productive as we are and get the things done that we get done if we don't have the support system behind us," said Larry Palmer with NorCal Team 10.
Officials say these efforts are critical not only for the crews' health and safety but also for protecting the land at Avocado Lake.
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