The wildfire has burned 22,986 acres across 10 days and destroyed at least 12 structures in the Cleveland National Forest with more than 1,300 firefighters on the front lines.
A few mandatory evacuation orders remain, but most have been lifted and a long stretch of Ortega Highway has been reopened.
The fire has been burning since Aug, 6, when it was first reported near Holy Jim Canyon and Trabuco Creek roads - across the main divide between Orange and Riverside counties.
Fire officials say they expect to reach full containment by Friday.