Update: 10% containment reached for Acorn Fire in San Bernardino County
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Updated: 8:02 p.m. May 7
First discovered: 5 hours ago, 2:52 p.m. May 7
Initial location: Acorn Road and Hwy 138, Pinon Hills, San Bernardino County, Calif.
Fire unit: Unified Command: Cal Fire San Bernardino Unit & San Bernardino County Fire
Fire type: Wildfire
Fire name: Acorn Fire
Acorn Fire initially started today at 2:52 p.m. at Acorn Road and Hwy 138, Pinon Hills in San Bernardino County, California.
Since its discovery five hours ago, it has burned 10 acres. By Thursday evening, the fire crew effectively contained 10% of the wildfire. However, the cause is still under investigation.
See live video from the area:
Https://cameras.alertcalifornia.org/?id=Axis-Table1
Fire containment
This is what 10% containment means
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 contained 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
United Robots Sacramento
This story was originally published May 7, 2026 at 3:44 PM.