Evacuations are underway for the recreational areas of Silverwood Lake.
Crews were battling two different fires in the Inland Empire Saturday afternoon, with one burning on both sides of Highway 138.
The first fire, which is being called the Lake Fire, is burning near Silverwood Lake, north of Crestline and Lake Arrowhead.
At least 478 acres have burned with no containment as of 7 p.m. Saturday. Fire crews will work through the night to build containment lines.
Gusty south winds and low humidity in the area remained a challenge for crews.
Fire authorities said it has the potential to burn 1,000 acres.
Evacuation orders are in effect for the area south of Highway 138 between the 15 Freeway and Highway 173.
Evacuation warnings are in effect north of Highway 138 and Highway 173, from Summit Valley Road to Arrowhead Lake Road.
The fire is burning on both sides of Highway 138. Part of that highway remains shut down.
Another fire erupted near San Timoteo Canyon in the Inland Empire.
The Smiley Fire was first spotted at around 2:30 p.m. Saturday.
The fire burned at least 83 acres and was 30% contained as of 8:15 p.m.
It is not clear how the fire started.