A fire that started in Lower Lake on Saturday afternoon is nearing full containment. Cal Fire said the Rock fire started just before 4 p.m. near Butte Rock Ranch Road and Morgan Valley Road. By Saturday night, Cal Fire said the fire was 39 acres and 90% contained. Four engines and 15 firefighters were assigned to the incident as of Saturday night. Units continued to monitor the incident, with a crew scheduled to return on Sunday morning. The cause remains under investigation.