Kieh Tree Risk Assessment Form.pdfISA. Basic Tree Risk Assessment Form
Client
Address/Tree location
Tree species
Assessor(s)
Date
dbh Height
Tools used
Target Assessment
Tree no
Time
Sheet.
Crown spread dia.
Time frame
of
`w
Target zone
Occupancy
M1•
E
c
Target description
Target protection
s a
3 c
r
3 =
s �;
'3 =
rate
1-rare
.2 OJ
, :°
c M1
•F
a
V,
x
�q.••i
x
14
2—occasional
3—frequent
u
R o
i u
N
F
F
F
F
4—constant
a E
z c.
1
Home west of trees
n
v
v
Y
4
n
n
2
Home northwest of trees
n
v
y
v
4
n
n
3
Home southwest of trees
n
y
v
Y
4
n
n
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 21 %
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 ❑
Crowndensity 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 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 ElSimilar branches present ❑
Pruning history
Crown cleaned ❑ Thinned ❑ Raised ❑ Dead/Missing bark ❑ Cankers/Galls/Burls ❑ Sapwood damage/decay ❑
Reduced ❑ Topped ❑ Lion -tailed ❑ Conks ❑ Heartwood decay ❑
Flush cuts ❑ Other Response growth
Condition (s) of concern
Part Size Fall Distance Part Size Fall Distance
Load on defect N/A ❑ Minor ❑ Moderate ❑ Significant ❑ Load on defect N/A ❑ Minor ❑ Moderate ❑ Significant ❑
Likelihood of Improbable❑ Possible Probable ❑ Imminent ❑ Likelihood 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
CCondition (s) of concern
Condition (s) of concern
Part Size Fall Distance Part Size Fall Distance
Load on defect N/A ❑ Minor ❑ Moderate ❑ Significant ❑ Load on defect N/A ❑ Minor ❑ Moderate ❑ Significant ❑
Likelihood of failure improbable Possible Probable ❑ Imminent ❑ Likelihood of failure Improbable❑ Possible❑ Probable ❑ Imminent ❑
Page I of 2
Risk Categorization
Target
(Target number
or description)
Tree part
Conditions)
of concern
Likelihood
Consequences
Risk
rating
(from
Matrix 2)
Failure
Impact
Failure & Impact
(from Matrix 1)
N
c
fli
o
£
3
o
3
v
Lao
2
>
a
Y
s
3
E
voi
v
Y
>
on
Z
c
in
v
Ln
1
main stem/
branch
Failure of large
section
mod
2
mod
3
mod
1
Branch
Failure of small
section
low
2
low
3
low
Matrix I. Likelihood matrix.
Likelihood
of Failure
Likelihood of Impact
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.
Likelihood of
Failure & Impact
Consequences of Failure
Negligible
Minor
Significant
Severe
Very likely
Low
Moderate
High
Extreme
Likely
Low
Moderate
High
High
Somewhat likely
Low
Low
Moderate
Moderate
Unlikely
Low
Low
Low
Low
Notes, explanations, descriptions
Mitigation options
1.
2.
3.
4.
North
Residual risk
Residual risk
Residual risk
Residual risk
Overall tree risk rating Low ❑ Moderate 0 High ❑ Extreme ❑
Overall residual risk None ❑ Low 8 Moderate ❑ High ❑ Extreme ❑ Recommended inspection interval
Data 0 Final ❑ Preliminary Advanced assessment needed ❑No ❑Yes-Type/Reason
Inspection limitations BNone ❑Visibility ❑Access ❑Vines ❑Root collar buried Describe
This datasheet was produced by the International Society of Arboriculture (ISA) 2017 Page 2 of 2