Update: Containment progress - Tusil Fire in San Diego County at 25%

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Updated: 8:03 a.m. May 20

First discovered: 19 hours ago, 1 p.m. May 19

Initial location: Tusil Road, Campo Reservation, San Diego County, Calif.

Fire unit: Cal Fire San Diego Unit

Fire type: Wildfire

Fire name: Tusil Fire

Tusil Fire initially started 1 p.m. May 19 on Tusil Road, Campo Reservation in San Diego County, California.

Since its discovery 19 hours ago, it has burned 1,000 acres. By Wednesday morning, a crew of 178 firefighters effectively contained 25% of the fire. The cause is, however, still being investigated.

25 engines, two water tenders, two helicopters, one dozer and seven hand crews are working to suppress the fire. According to Cal Fire, "Numerous firefighting air tankers from throughout the State are flying fire suppression missions as conditions allow."

Evacuation information from Cal Fire

Evacuation Orders

Immediate threat to life. This is a lawful order to LEAVE NOW. The area is lawfully closed to public access.

Evacuation Orders have been issued for the following zones:

SDC-2170

SDC-2172

SDC-2240

Evacuation Warnings

Potential threat to life and/or property. Those who require additional time to evacuate, and those with pets and livestock should leave now.

Evacuation Warnings have been issued for the following zones:

SDC-2169

SDC-2171

SDC-2173

SDC-2325

SDC-2326

See live video from the area:

Https://cameras.alertcalifornia.org/?id=Axis-WhiteStarNorth

Fire containment

What does 25% containment mean?

Containment indicates what percentage of the fire perimeter has been surrounded by a control line. In this case, it means that 25% of the wildfire is contained from spreading, while 75% 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 May 20, 2026 at 1:12 AM.