Updated: 7:47 p.m. May 21

First discovered: 51 hours ago, 4:47 p.m. May 19

Initial location: Seast of Hwy 152 near Dinosaur Pt. Road, San Luis Reservoir, Merced County, Calif.

Fire unit: Cal Fire Madera-Mariposa-Merced Unit

Fire type: Wildfire

Fire name: Santa Fire

Santa Fire initially started 4:47 p.m. May 19 near Seast of Hwy 152 near Dinosaur Pt. Road, San Luis Reservoir in Merced County, California.

After being active for two days, it has burned 160 acres. The fire crew managed to contain the fire entirely by Thursday evening. The cause of it is still under investigation.

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 the wildfire has been fully enclosed by a control line 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