The U.S. Forest Service says the fire was 23 percent contained on Wednesday morning, up from 20 percent the previous day. The fire has now consumed 293 square miles.
Crews plan to focus on structure defense along the southeast edge of the fire on Wednesday and continue constructing a contingency line ahead of communities to the north, including Tuolumne City.
The fire is threatening 4,500 structures. Forest service officials have confirmed that three commercial properties and 85 tent cabins were destroyed at a camp run by the city of Berkeley, adding to the 23 structures that were previously reported as destroyed.