Five different spot fires along Interstate 80 prompted the CHP to close eastbound lanes of the highway at Applegate.
According to Cal Fire spokesperson Daniel Berlant, five fires have burned a combined 350 acres and are threatening about 80 structures as of 6 p.m.
A FOX40 crew captured at least one burned structure, believed to be a home.
Berlant said the fires were suspicious, but an exact cause has yet to be released.
According to the Placer County Sheriff's Department, there are mandatory evacuations in place for the following streets in the Weimar/Applegate areas:
Pine Cone Peak
Hummingbird Hill Road
High View Lane
Hidden Meadow Way
Hidden Meado Court
Hidden Meadow Road
Pine Knoll Road
Quail Mountain Court
Sierra Pines Road
Applegate Road between Boole and Heather Glen
Ponderosa Way to State Park boundary
Bridge Trail Way
According to Caltrans, cars can use Bell Road to northbound Highway 49 as a detour. Big rigs are to use Highway 20.
Evacuation centers have been set up at Sierra Vista Community Center, 55 School St, Colfax (map), Veterans Memorial Hall, 24601 Harrison Street, Foresthill (map) and the Auburn Veterans Memorial Hall, 100 East Street, Auburn (map).
Check back here for updates on this developing story.