Update: Grand Fire in Los Angeles County remains 100% contained as of Sunday morning
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Updated: 8:48 a.m. May 17
First discovered: 18 hours ago, 2:45 p.m. May 16
Initial location: 70th Street East & East Avenue G, east of Lancaster, Los Angeles County, Calif.
Fire unit: Los Angeles County Fire Department
Fire type: Wildfire
Fire name: Grand Fire
Grand Fire initially started 2:45 p.m. May 16 at 70th Street East & East Avenue G, east of Lancaster in Los Angeles County, California.
It has burned 54.9 acres after being active for 18 hours. As of Sunday morning, the fire crew has achieved full containment of the blaze. However, the cause is still being investigated.
See live video from the area:
Https://cameras.alertcalifornia.org/?id=Axis-MtEmma1
Fire containment
What does 100% containment mean?
Note that full containment doesn't mean the fire is completely out. In this case, it means that firefighters have managed to get a line completely around the wildfire's perimeter and it is now stopped from spreading. A fully contained wildfire may continue to burn within the containment perimeter but is not likely to spread.
However, there's a significant difference between containing and controlling a wildfire. After the fire is fully contained, the next step is to control it. Controlling a fire means ensuring that the fire can't spread or cross the containment line.
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 17, 2026 at 9:13 AM.