Basic Tree Risk Assessment Form Page 2
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1
2Risk Categorization
Likelihood
Consequences
Failure & Impact
Failure
Impact
(from Matrix 1)
Risk
rating
of part
Conditions
Target
(from
of concern
protection
Tree part
Matrix 2)
1
2
3
4
Matrix 1.
Likelihood matrix.
Likelihood of Impacting Target
Likelihood
of Failure
Very low
Low
Medium
High
Imminent
Unlikely Somewhat likely
Likely
Very likely
Probable
Unlikely
Unlikely
Somewhat likely
Likely
Possible
Unlikely
Unlikely
Unlikely
Somewhat likely
Improbable Unlikely
Unlikely
Unlikely
Unlikely
Matrix 2.
Risk rating matrix.
Consequences of Failure
Likelihood of
Failure & Impact
Negligible
Minor
Significant
Severe
Very likely
Low
Moderate
High
Extreme
Likely
Low
Moderate
High
High
North
Somewhat likely
Low
Low
Moderate
Moderate
Unlikely
Low
Low
Low
Low
Notes, explanations, descriptions
_____________________________________________________________________
________
Mitigation options
Residual risk
____________________________________________________________________________________
________
Residual risk
____________________________________________________________________________________
________
Residual risk
____________________________________________________________________________________
________
Residual risk
Overall tree risk rating
Work priority
Low
Moderate
High
Extreme
1
2
3
4
Overall residual risk
Recommended inspection interval __________________
Low
Moderate
High
Extreme
Data Final Preliminary Advanced assessment needed No Yes-Type/Reason ________________________________________________
Inspection limitations None Visibility Access Vines Root collar buried Describe ___________________________________________
This datasheet was produced by the International Society of Arboriculture (ISA) and is intended for use by Tree Risk Assessment Qualified (TRAQ) arborists – 2013
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