"We kinda mix the science and art of firefighting to make sure we don't do more harm," said Yosemite National Park Fire Chief Kelly Martin.
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The national parks system has a Resource Advisor Program that tells them where to go without disturbing sensitive features like endangered plants.
"They look for areas that may be harmed or hurt by retardant, by dozer lines especially if there are archaeology sites that we don't want to be impacted," said Martin.
She says other than the rimfire that burned at the north end of the park in 2013, most of the park has little to no fire history over the last 100 years.
"Now with the drought the insect and disease and the tree mortality that's making things a lot worse," said Martin.
Overnight winds cause Ferguson blaze to explode in size
To maintain firefighter safety crews are doing firing operations a mile and a half away from the fire line.
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They are working to connect and strengthen containment lines along Wawona.
"The work that these firefighters and operations have done to contain that piece has made the community safer," said Martin.
Active fire and fire operations impact all three roads that access the Valley floor.
Though there are portions of the park that remain open along Tioga Road from the pass to White Wolf.
It is Yosemite Valley that sees the bulk of the parks, four million-plus annual visitors.
There is no estimated date as to when those parts of Yosemite are going to open back up but they say as soon as it's safe to do so they will.