Update: 10% containment reached for Custer wildfire in San Bernardino County

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Updated: 3:29 p.m. June 13

First discovered: 1:40 p.m. June 13

Initial location: 9075 Custer Ave. Lucerne, San Bernardino County, Calif.

Fire unit: Cal Fire San Bernadino Unit

Fire type: Wildfire

Fire name: Custer

Custer Fire initially started today at 1:40 p.m. on 9075 Custer Ave. Lucerne in San Bernardino County, California.

A fire crew of 175 effectively contained 10% of the fire by Saturday afternoon. The blaze's cause remains under investigation.

Firefighting efforts include 22 engines, three water tenders, two helicopters, two dozers and four hand crews. According to Cal Fire, "Numerous firefighting air tankers from throughout the State are flying fire suppression missions as conditions allow."

Fire containment

What does it mean for a fire to be 10% contained?

The percentage indicates how much of the fire perimeter has been surrounded by a control line. In this case, it means that 10% of the wildfire is halted from spreading, while 90% is still uncontrolled.

Containment is part of a larger plan for managing a wildfire. It is normally expressed as a percentage and it refers to how much of the fire perimeter has been surrounded/enclosed by a control line that firefighters create. The containment percentage indicates a certain level of control, but it doesn't always correlate to safety level. Also, it's important to note that containment doesn't mean a fire is out.

How is containment measured?

The incident's central command constantly receives progress reports from firefighters on the ground. As the fireline is constructed, inspected or reinforced, mappers record those details to adjust the containment percentage. The percentage tells the public how much of the fire perimeter is believed to not go beyond the control lines.

Source: Cal Fire

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This story was originally published June 13, 2026 at 3:22 PM.