Basic Tree Risk Assessment Form

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Basic Tree Risk Assessment Form
Client _______________________________________________________________ Date ___________________ Time _________________
Address/ Tree location _________________________________________________________ Tree no. ____________ Sheet _____ of _____
Tree species _________________________________________ dbh_____________ Height ___________ Crown spread dia. ____________
Assessor(s) __________________________________________ Time frame_____________ Tools used______________________________
Target Assessment
Target zone
Occupancy
rate
1– rare
Target description
2 – occasional
3 – frequent
4 – constant
1
2
3
4
Site Factors
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_____________________________________________________ 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 planned change in load factors _________________________________________________________________________________________
Tree Defects and Conditions Affecting the Likelihood of Failure
— Crown and Branches —
Unbalanced crown  LCR ______%
Cracks  ___________________________________ Lightning damage 
Dead twigs/branches  ____% overall Max. dia. ______
Codominant  __________________________________ Included bark 
Broken/Hangers Number __________
Max. dia. ______
Weak attachments  ___________________ Cavity/Nest hole ____% circ.
Over-extended branches 
Previous branch failures  _______________
Similar branches present 
Pruning history
Dead/Missing bark 
Cankers/Galls/Burls 
Sapwood damage/decay 
Crown cleaned 
Thinned 
Raised
Conks  Heartwood decay  ________________________
Reduced
Topped 
Lion-tailed 
Flush cuts
Other
Response growth
Main concern(s)
Load on defect
N/A 
Minor  Moderate  Significant 
Likelihood of failure
Improbable
Possible
Probable
Imminent
— Trunk —
— Roots and Root Collar —
Dead/Missing bark 
Abnormal bark texture/color 
Collar buried/Not visible  Depth________
Stem girdling 
Codominant stems 
Included bark 
Cracks 
Dead 
Decay  Conks/Mushrooms 
Sapwood damage/decay  Cankers/Galls/Burls  Sap ooze 
Ooze 
Cavity  _____% circ.
Lightning damage  Heartwood decay  Conks/Mushrooms 
Cracks 
Cut/Damaged roots  Distance from trunk _______
Cavity/Nest hole _____ % circ. Depth _______
Poor taper 
Root plate lifting 
Soil weakness 
Lean _____ ° Corrected? ________________________________
Response growth
Response growth
Main concern(s)
Main concern(s)
Load on defect
N/A  Minor  Moderate  Significant 
Load on defect
N/A  Minor  Moderate  Significant 
Likelihood of failure
Likelihood of failure
Improbable
Possible
Probable
Imminent
Improbable
Possible
Probable
Imminent
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