Update, 8:30 a.m. Thursday.
The fire remains at 50 percent containment, according to Cal Fire.
“Crews will be working on the fireline all day and into the evening,” the agency said, adding that containment will increase as firefighters continue to work. Click here for the most recent information on the fire.
A fire burned more than 2,000 acres near Shandon Wednesday afternoon and forced a brief closure of Highway 46.
As of 6:30 p.m., firefighters had reached 50% containment and stopped forward progress on the McMillan Fire, which broke out a little before 1 p.m.
The CHP closed the highway after the fire jumped lines and forced Cal Fire to evacuate its command post.
The westbound lanes of the highway were closed at Bitterwater Road, and eastbound lanes were closed at the intersection with Highway 41.
The cause of the fire is unknown, but it was the latest in a flurry that have burned in the eastern area of San Luis Obispo County over the last week.
On Monday afternoon, six vegetation fires broke out south of Shandon and burned 120 acres before they were contained.
Last weekend, firefighters battled a rash of fires that broke out from Santa Margarita to Lake Nacimiento.
On June 5, a fire in California Valley burned 1,127 acres.