A brush fire that charred 70 acres along Highway 20 near Clearlake Oaks in Lake County was 80 percent contained as of Saturday night, a Cal Fire dispatcher said.

The blaze, reported just before 6 p.m. Friday, is near Double Eagle Ranch on the south side of Highway 20. Dispatcher Louis Karlow said full containment was expected by 6 p.m. Sunday.

No structures have been threatened and no evacuations were reported.

The blaze is burning on grass hillsides and oak woodland, including some steep terrain, said Cal Fire spokeswoman Tiffany Mercado.

The cause of the fire remains under investigation.

Weather in the high 90s was forecast Saturday with gusts of 10 to 15 mph. Crews were likely to be on the blaze through the weekend, Mercado said.

Based on the resources on scene, more than 200 firefighters were assigned Saturday morning, Mercado said. That included eight hand crews, 10 engines, one helicopter, two bulldozers, two water tenders and supervising personnel on the ground and in the air.

In addition to Cal Fire, local firefighters from Clearlake Oaks, Upper Lake and Northshore were on scene.

The CHP on Friday night was slowing traffic through the area, according to Lake County News.

Mercado said she did not have updated information about traffic controls in place Saturday.

You can reach Staff Writer Brett Wilkison at 521-5295 or brett.wilkison@pressdemocrat.com.