Snags are dead, standing trees without leaves or needles in the crowns and present a significant threat to forest worker safety. Snags may burn through more quickly than green trees and can fall without warning. 

Live, structurally compromised green trees weakened by insects, disease, weather, fire, and age can also fall without notice.

Consider the severity, probability, and exposure of hazard tree problems continually as you perform duties in forested communities. Remember to look for hazard tree risks at staging areas, parking areas, and camping areas.

Felling a hazard tree requires accurate risk assessment and complexity analysis, and demands the sawyer’s full situational awareness. In all cases, remember to establish and maintain a secure felling area.

Do not bypass hazard trees without taking some action such as felling or establishing a No-Work-Zone.

Degree of hazard varies with tree size, species, and type/location of defect:

Felling a hung-up hazard tree is a particularly hazardous and complex task. Safely felling a hang-up requires extreme caution and expertise.

Some common tree deficiencies which contribute to potential felling hazards:

Weak Limbs: limbs of all sizes and species with decay evident cracking, loose, hung-up, or fire damaged limbs. Avoid working under overhead hazards.

Snags (dead, standing trees without leaves or needles in the crowns) and other hazard trees present a significant hazard to wildland firefighters. Snags typically have much lower fuel moistures than live, green trees; they are subject to rot and they burn more readily. In the process, they often throw firebrands far in advance of the main fire and often burn through more quickly than green trees, falling with little or no warning. Live, green trees that have been weakened by insects, disease, weather, past fires, and age present equal hazard and can fall without warning.

Chainsaw safety is every saw operator’s job.