2 of 5 8/2020
Grand Oak Point System and
Condion Evaluaon Form
POINT SYSTEM
Grand Oak: A Grand Oak is a tree of a genus Quercus with a trunk measuring 34” DBH (tree trunk diameter
measurement at 4.5 feet above grade) and greater with a tree condion rang of good or beer and with trunk
circumference, height and crown measurements totaling a minimum of 175 points in accordance to the Tree Point
System methodology.
Tree Point System: The Tree Point System classies the signicance of a tree through three measurements of the
tree’s anatomy and asserts a point value for each measurement. One (1) point per inch is alloed for the tree trunk
circumference to the nearest inch measured at 4.5 feet above grade, one (1) point per foot is alloed for the tree’s
overall height and one (1) point per four (4) feet is alloed for the crown spread to the nearest foot averaging a
measurement of the longest and shortest dimension of the tree’s canopy.
Circumference: Using a standard measure, tape measure the distance around the tree trunk and this
will provide the circumference. If the tree has co-dominant trunks, measure each trunk at 4.5 feet
above the ground surface and add them together unless the piths of each trunk merge at a point
above the root collar. In this circumstance, measure the narrowest point of the supporng trunk
below the point of pith mergence to obtain the tree trunk circumference. This inch measurement
is the total circumference point score for the tree. If it is equal to or over 175 inches, the Tree Point
Score for the denion of a Grand Oak is met and no other measurements are required. (Measuring
the tree trunk diameter will require mulplying this measurement by 3.14 to obtain the tree trunk
circumference).
Feet Inches Circumference Points
Circumference _____________ _____________ ________________________
(14’7” will equal 175 points)
Height: Equipment that could be used is a 100’ plus reel tape, ground spike and a clinometer. First
place the ground spike at the base of the tree and aach the tape. Measure 100’ away from the
tree. Using a clinometer view the top of the tree. Read the right side scale on the rotang wheel.
This is your measurement in feet. If you are on level ground, no other measurement is needed. If
the ground is not level, view the base of the trunk aer determining the height. Noce if the scale
reads posive or negave. If the number is negave, add that to your height measurement. If it’s
posive subtract it from your height score. Where obstacles obstruct measurements or for very tall
trees measure out from the tree 50 or 200 feet.
Measurement taken at
Adjustment Height Points
Top in feet
100’
Base in feet
50’ (divide
Top in feet
measurement by 2)
Base in feet
200’ (mulply
Top in feet
measurement by 2)
Base in feet
Crown Spread: Observe the tree’s canopy and locate its widest and narrowest points. Measure, in
feet, both from dripline to dripline. Average the two gures and divide by 4 to get the spread score.
Widest Narrowest Average Spread Points
Grand Total Points ____________
