CLAYTON (CBS SF) — Firefighters are starting to get an upper hand on a wildfire that started Wednesday afternoon and burned quickly through a part of unincorporated Contra Costa County south of Clayton.

As of 9 p.m., the Marsh Fire, which prompted evacuations and threatened 100 structures, was 20 percent contained and its forward progress had been stopped, Cal Fire officials said.

It started at 2:40 p.m. in the area of Marsh Creek Road and Morgan Territory Road. The fire has burned 247 acres.

Cal Fire officials do not have an estimate for when crews will have the fire fully contained.

No one has been injured but the fire has destroyed a home and three outbuildings.

Cal Fire officials said the fuel is dry grass and brush in steep terrain along Marsh Creek Road, prompting a large regional response, which at 9 p.m. consisted of 180 personnel from agencies such as the Contra Costa County Fire Protections District among other local agencies.

Cal Fire officials said mandatory evacuation orders are in place for Marsh Creek Road from Morgan Territory Road to Gill Drive. Power will be out there until 9 a.m. Thursday.

But Marsh Creek Road between Deer Valley Road and Gill Drive is open at Deer Valley Road to residents with identification Marsh Creek Road is closed at Gill Drive, Clayton Road and Morgan Territory Road.

Morgan Territory Road and Leon Drive are open but power will be out there until 9 a.m. Thursday.

Evacuation centers have opened at the Clayton Library at 6125 Clayton Road in Clayton and at the Brentwood Community Center at 35 Oak St. in Brentwood. Additional information is available online by following #MarshFire on Twitter.

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