Butte County fire crews are being challenged by multiple fires that all started Thursday. The Nelson Fire is 60% contained after burning 275 acres of open grassland near the Thermalito Forebay of Oroville Lake. The Sandra Fire is 30% contained after burning 40 acres in the Robinson Mill/Forbestown area. The forward progress has been stopped. One civilian and one firefighter were injured. The Marion Fire burned about 5 acres in South Oroville.