Air support drops water from the Feather River as the Dixie Fire grows in Plumas National Forest, California, U.S., July 15, 2021.

Firefighters spray water from a fire train to hot spots along the tracks over Rock Creek Bridge as the Dixie Fire grows in Plumas National Forest, California, U.S., July 15, 2021.

Power lines are framed by flames as the Dixie Fire grows in Plumas National Forest, California, U.S., July 15, 2021.

Trees smolder as the Dixie Fire grows in Plumas National Forest, California, U.S., July 15, 2021.

Trees smolder as the Dixie Fire grows in Plumas National Forest, California, U.S., July 15, 2021.

Air support gathers water from the Feather River as the Dixie Fire grows in Plumas National Forest, California, U.S., July 15, 2021.

Air support drops water from the Feather River as the Dixie Fire grows in Plumas National Forest, California, U.S., July 15, 2021. =

Firefighter monitor the advance as the Dixie Fire grows in Plumas National Forest, California, U.S., July 15, 2021.

A Napa California crew monitors the Dixie Fire as it grows in Plumas National Forest, California, U.S., July 15, 2021.

A tree burns as other smolder as the Dixie Fire grows in Plumas National Forest, California, U.S., July 15, 2021.

Air support gathers water from the Feather River as the Dixie Fire grows in Plumas National Forest, California, U.S., July 15, 2021.

A motorist stops along the Feather River as the Dixie Fire grows in Plumas National Forest, California, U.S., July 15, 2021.

Firefighters spray water from a fire train to hot spots along the tracks over Rock Creek Bridge as the Dixie Fire grows in Plumas National Forest, California, U.S., July 15, 2021.

Firefighters ride on a fire train checking for hot spots along the tracks as the Dixie Fire grows in Plumas National Forest, California, U.S., July 15, 2021.