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Portland Trees

Call before you cut

phone: (503) 823-TREE (8733)


1900 SW 4th Avenue, Portland, OR 97201

Performance Path

When it is not practical to establish a root protection zone to the specifications of the Prescriptive Path method, you may use alternative measures to modify the root protection zone. When modifying the root protection zone in size or using alternative construction techniques, the following standards must be met:

  • The alternative root protection method must be prepared by an arborist who has visited the site and examined the tree’s size, location, and extent of root cover, evaluated the tree’s tolerance to construction impact based on its species and health, and identified any past impacts that have occurred within the root zone
  • The arborist must prepare a tree protection plan describing how the alternative method provides an adequate level of protection, based on the findings from the site visit described above. The arborist must sign the tree preservation and protection plan and include their contact information
  • After the arborist prepares the protection plan, mark the root protection zone with fencing and root protection zone signage stating that violations of the root protection zone will result in penalties
  • If the arborist is required to be on site during construction activity, make sure to sign a contract for those services. The contract should include a final report from the arborist documenting all inspections and verifying the viability of the trees after the construction phase