Update: Morgan Fire in Contra Costa County at 30% containment

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Updated: 9:19 a.m. July 18

First discovered: 32 hours ago, 1:14 a.m. July 17

Initial location: Morgan Territory Road and Marsh Creek Road, Mt. Diablo, Contra Costa County, Calif.

Fire unit: Cal Fire Santa Clara Unit

Fire type: Wildfire

Fire name: Morgan Fire

Morgan Fire initially started 1:14 a.m. July 17 at Morgan Territory Road and Marsh Creek Road, Mt. Diablo in Contra Costa County, California.

By Saturday morning, it had destroyed 50.8 acres. As of Saturday morning, the fire crew succeeded in containing 30% of the fire. There is currently no information on the cause of the fire.

Fire containment

What does it mean for a fire to be 30% contained?

Containment indicates what percentage of the fire perimeter has been surrounded by a control line. In this case, it means that 30% of the wildfire is halted from spreading, while 70% 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 July 18, 2026 at 7:56 AM.