Consulting arborists and tree care companies
Turn field notes into a city-ready arborist report: tree table, risk notes and a tree protection plan for you to review and sign. Free to read.
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How it works
What you get
The first draft is free to read. Each document after it is drafted from the same confirmed facts.
Modeled on: ISA Basic Tree Risk Assessment Form and the city's tree code (e.g. Portland City Code Title 11)
From public data
of trunk diameter is the minimum radius of Portland's prescriptive root protection zone around a tree on a development site
Source: Portland City Code 11.60.030
Questions
It depends on the city. Portland's tree plan, for example, shows the trees on and near the site, marks which stay, sets protection measures that meet its tree protection specifications, and needs an arborist's supporting documentation to exempt a tree for poor health or condition.
Under Portland's prescriptive path it's at least one foot of radius per inch of trunk diameter, fenced with 6-foot chain link. New encroachments must stay under 25% of the remaining zone and no closer than half the radius. Other cities set their own rules.
The ISA Tree Risk Assessment Qualification is a voluntary credential for ISA Certified Arborists and holders of some other credentials: a training course, then a written and a performance-based assessment, with retraining and retesting every seven years. ISA's Basic Tree Risk Assessment Form is used throughout the program.
Related doors
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Answer it and the project exists. Three more questions, then the draft.