Regulations for street trees
Requirements for street trees - those fronting public or private streets or access drives - within the Urban Growth Boundary.
Lots or parcels on street corners must maintain sight requirements
Our list of Approved Street Trees are in our Road Design and Construction Standards. Species are appropriate for street and sidewalk frontages.
Inside an urban growth boundary, when fronting on public or private roadways or access drives, new structures including a Single Detached Dwelling Unit or Duplex on an existing lot or parcel, or Middle Housing, and any Standard Land Division or Middle Housing Land Division, shall be required to plant street trees in accordance with the following standards:
The species of street trees to be planted shall be chosen from the approved list of street trees unless approval of another species is given by the Director through a Type I procedure. Trees shall be selected and spaced to provide canopy overlap for shade. Trees shall be installed at an average of one tree per 35 feet of lineal road frontage unless otherwise required by district standards, or the Director approves, through a Type I procedure, a greater average spacing based on submitted evidence demonstrating the approved species typically requires such spacing, and that the alternative spacing will result in canopy overlap.
Exemption from the requirement to plant street trees may be granted by the Director to the extent that existing trees meet location and diameter requirements below. This exemption may be granted through a Type I procedure;
Street trees shall be installed on public or private property no more than five feet from the designated right-of-way; and
Street trees shall be a minimum of 1½ inches in diameter as measured at four feet above grade.
Lots or parcels on street corners (public and/or private) shall maintain a sight triangle with no sight obstruction between 3 feet and 10 feet in height as measured from street grade. Sight obstructions include, but are not limited to, fences, vegetation, berms, and structures. The sight triangle shall be measured from the street corner (apex), a distance of 20 feet along each street side (see Figure 1). For the purpose of this Section, street corner is defined as that point where the extended edge of the road surface of two intersecting streets meet. The county may require additional vision clearance based on a hazard identified by the county. Nothing in this Section shall supersede proper application of the sight distance standards in Section 501-8.5 F.