Wildfire Terminology 101: Understanding Firelines, Containment, Mop-Up and More

Description: Learn the meaning of common wildfire terms used in Gold Mountain Fire updates, including containment, fireline, mop-up, hot spots, dozers, air attack and UAS...

Fireline – A barrier built to stop or slow the spread of a wildfire. Fireline may be constructed by hand, with heavy equipment, or by using natural features like rock outcroppings or roads.

Containment – Containment refers to the percentage of the fire's perimeter that firefighters are confident the fire will not cross. It does not mean that percentage of the fire has been extinguished. A section of fireline is only considered contained after crews are confident it will hold, even under changing weather conditions.

Improving Line – Strengthening an existing fireline to make it more effective. This might include widening it, removing remaining vegetation, cooling nearby hot spots, or reinforcing weak areas.

Patrolling – Firefighters regularly inspect completed sections of fireline, looking for smoke, heat, or anything that could threaten containment. Patrol crews quickly address any issues they find to ensure the line continues to hold.

Brushing – Cutting and removing shrubs, small trees, and other vegetation along or near a fireline to reduce available fuel and create safer working conditions for firefighters.

Chipping – Feeding cut branches and small trees into a wood chipper to quickly dispose of vegetation removed during line construction. This helps reduce fuel and keeps roads and work areas clear.

Dozer – A bulldozer specially assigned to wildfire operations. Dozers remove vegetation and scrape away organic material to quickly build containment lines where terrain allows.

Mop-Up – Extinguishing or cooling remaining hot spots near the fireline by digging out burning material, applying water, or separating fuels to ensure the fire can't cross the line.

Hot Spot – An area of lingering heat that can continue to smolder or potentially reignite if conditions become favorable.

Snag – A dead or damaged tree that could fall without warning. Removing hazardous snags is an important part of keeping firefighters safe.

Air Attack – The aircraft that coordinates all firefighting aviation resources over the incident, ensuring helicopters and air tankers operate safely and effectively.

UAS (Unmanned Aircraft System) – Commonly called a drone, these aircraft are used by the incident to map the fire, detect heat with infrared cameras, assess conditions, and support firefighters on the ground.

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