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Understanding Tree Risk Assessments

Understanding Tree Risk Assessments. Risk Assessments Goals. Ensure the safety of people and property Promote tree and forest health toward reducing future hazards. Hazard Tree.

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Understanding Tree Risk Assessments

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  1. Understanding Tree Risk Assessments

  2. Risk Assessments Goals • Ensure the safety of people and property • Promote tree and forest health toward reducing future hazards

  3. Hazard Tree • A tree that has been assessed as having characteristics that, in the opinion of a qualified assessor, make it an unacceptable risk for continued retention.

  4. When is it a “hazard”?

  5. Targets ? • Houses and buildings • Powerlines • Roads • Parking areas or driveways • Yards, patios and fences • Play areas

  6. Size of Part ? • < 6 inches • 6-18 inches • 18-30 inches • >30 inches i.e. “The bigger they are, the harder they fall.”

  7. Probability of Failure ? Species specific Root decays Leans Cracks/Seams Crown class Disturbance history Live crown ratio

  8. What we use in Bellevue? • City of Bellevue • “Tree Hazard Declaration Form” • A complete Tree Risk Assessment • ISA Tree Hazard Evaluation • Complete Tree Risk Assessment

  9. Any Questions? Thank you Kevin LeClair kleclair@bellevuewa.gov (425) 452-2928

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