Tree hazard evaluation form 2026

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The document is a Tree Hazard Evaluation Form from the City of Seattle's Department of Planning and Development, designed for certified arborists to assess the hazard level of trees. It includes sections for tree characteristics, health, site conditions, defects, and hazard ratings. Arborists must complete all sections to determine if immediate action is needed, further inspection is required, or if the tree is dead. The form emphasizes evaluating factors such as tree size, target proximity, and potential risks associated with tree failure.

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Click ‘Get Form’ to open the tree hazard evaluation form in the editor.
Begin by filling in the site address and location map. This information is crucial for identifying the specific tree being evaluated.
Complete the hazard rating section by assessing failure potential, size, and target ratings. Use the provided formula to calculate the overall hazard rating.
In the tree characteristics section, provide details such as species, diameter at breast height (DBH), number of trunks, and other relevant metrics that describe the tree's physical attributes.
Evaluate tree health by noting foliage cover, density, annual shoot growth, and any signs of pests or diseases. This will help assess the overall vitality of the tree.
Assess site conditions including landscape type and recent disturbances. Document any obstructions or soil problems that may affect tree stability.
Fill out the target section to identify potential risks associated with nearby structures or activities that could be impacted by a falling tree.
Finally, review all sections for completeness before signing off as a certified arborist. Ensure all necessary actions are noted in the hazard abatement section.

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2006	4.7 Satisfied (41 Votes)

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Is Falling trees a hazard?

A tree failure occurs when a tree or large part of a tree breaks and falls. Trees become a potential hazard when there is a target. A target is a structure, vehicle or a person that would be struck by a falling tree or its parts. The target directly influences the degree of hazard.

How much damage can a tree sustain?

If enough of the root system is destroyed or detached, the tree will die. As a general rule, 20% of the root system can be destroyed before the tree will show signs of injury. If 40% of the root system is lost, the tree will probably die. It should also be removed because it is hazardous.

What is a high risk tree?

As defined in the tree care industry, a "Hazard Tree" is a tree that poses a level of risk to people or property that exceeds the risk tolerance of the property owner or manger. This means that a tree that may be considered a hazard to one property owner may not be considered to be a hazard by another property owner.

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