Basic Tree Risk Assessment Form

1 Trunk Crown and Branches Roots and Root Collar Unbalanced crown LCR _____% Dead twigs/branches _____% overall Max. dia. _____Broken/Hangers Number _____ Max. dia. _____Over-extended branches Pruning historyCrown cleaned Reduced Flush cuts Thinned Topped Other Raised Lion-tailed Cracks _____ Lightning damage Codominant _____ Included bark Weak attachments _____ Cavity/Nest hole ____% branch failures _____ Similar branches present Dead/Missing bark Cankers/Galls/Burls Sapwood damage/decay Conks Heartwood decay _____ Response growthClient _____ Date _____ Time _____Address/Tree location _____Tree Sheet _____ of _____Tree species _____ dbh_____ Height _____ Crown spread dia.

2 _____ Assessor(s) _____ Tools used_____ Time frame_____Target Assessment Target numberTarget descriptionTarget protection Practical to move target? Restriction practical?Target within drip line Target within 1 x within x History of failures _____ Topography Flat Slope _____% Aspect _____Site changes None Grade change Site clearing Changed soil hydrology Root cuts Describe _____Soil conditions Limited volume Saturated Shallow Compacted Pavement over roots _____% Describe _____Prevailing wind direction_____ Common weather Strong winds Ice Snow Heavy rain Describe _____Tree Health and Species Profile Vigor Low Normal High Foliage None (seasonal) None (dead) Normal _____% Chlorotic _____% Necrotic _____% Pests/Biotic_____ Abiotic _____ Species failure profile Branches Trunk Roots Describe _____Load Factors Wind exposure Protected Partial Full Wind funneling _____ Relative crown size Small Medium Large Crown density Sparse Normal Dense Interior branches Few Normal Dense Vines/Mistletoe/Moss _____ Recent or expected change in load factors _____Tree Defects and Conditions Affecting the Likelihood of FailureOccupancy rate1 rare 2 occasional 3 frequent 4 constantBasic Tree Risk Assessment FormPage 1 of 2

3 Site FactorsTarget zoneCondition(s) of concernLoad on defect N/A Minor Moderate Significant Likelihood of failure Improbable Possible Probable Imminent Load on defect N/A Minor Moderate Significant Likelihood of failure Improbable Possible Probable Imminent Part SizeFall DistanceLoad on defect N/A Minor Moderate Significant Likelihood of failure Improbable Possible Probable Imminent Dead/Missing bark Abnormal bark texture/color Codominant stems Included bark Cracks Sapwood damage/decay Cankers/Galls/Burls Sap ooze Lightning damage Heartwood decay Conks/Mushrooms Cavity/Nest hole _____ % circ.

4 Depth _____ Poor taper Lean _____ Corrected? _____ Response growth Condition(s) of concern Part SizeFall DistanceCollar buried/Not visible Depth_____ Stem girdling Dead Decay Conks/Mushrooms Ooze Cavity _____% Cut/Damaged roots Distance from trunk _____Root plate lifting Soil weakness Response growthCondition(s) of concern Load on defect N/A Minor Moderate Significant Likelihood of failure Improbable Possible Probable Imminent Part SizeFall DistancePart SizeFall Distance Target (Target number or description)Tree partCondition(s) of concernRisk rating (from Matrix 2) Matrix 1.

5 Likelihood matrix. Likelihood of FailureLikelihood of ImpactVery lowLowMediumHighImminentUnlikelySomewhat likelyLikelyVery likelyProbableUnlikelyUnlikelySomewhat likelyLikelyPossibleUnlikelyUnlikelyUnli kelySomewhat likelyImprobableUnlikelyUnlikelyUnlikely UnlikelyFailureImpactFailure & Impact (from Matrix 1)LikelihoodImprobableImminentPossibleVe ry lowUnlikelyNegligibleMediumLikelySignifi cantProbableLowSomewhatMinorHighVery likelySevereConsequencesLikelihood of Failure & ImpactConsequences of Failure Negligible MinorSignificantSevereVery likelyLowModerateHighExtremeLikelyLowMod erateHighHighSomewhat likelyLowLowModerateModerateUnlikelyLowL owLowLow Data Final Preliminary Advanced Assessment needed No Yes-Type/Reason _____Inspection limitations None Visibility Access Vines Root collar buried Describe _____Notes, explanations.

6 Residual risk Residual risk Residual risk Residual risk _____Overall tree risk rating Low Moderate High Extreme Overall residual risk None Low Moderate High Extreme Recommended inspection interval_____This datasheet was produced by the International Society of Arboriculture (ISA) 2017 NorthPage 2 of 2 Matrix 2. Risk rating CategorizationMitigation options