A firefighter monitors a firing operation while battling the Glass Fire in Calistoga, California, US on Oct 2, 2020. (Photo: Agencies)

Wildfires in US Northern California are still surging while firefighters continue to make progress in containment, according to the updates by the California Department of Forestry and Fire Protection (Cal Fire) on Saturday.

The August Complex, the largest fire in California's history, was 979,386 acres (3,963 square km) in size with 51 percent containment, Cal Fire reported Saturday morning.

The Zogg Fire in Shasta and Tehama counties grew slightly overnight to 56,305 acres (228 square km), Cal Fire said. The fire had killed four people and destroyed 179 buildings, and was 57 percent contained.

On Friday evening, two inmate firefighters were injured fighting the Zogg Fire, Cal Fire reported Saturday.

The Creek fire in Fresno, Madera counties was 312,063 acres (1,263 square km) in size and 49 percent contained, according to Cal Fire.

Cal Fire has downgraded evacuation orders to warnings in three areas in San Mateo County affected by the CZU Lightning Complex fire, which has been fully contained.