(Amended by Ordinance Nos. 187675 and 188278, effective April 14, 2017.)
A. Where these regulations apply.
1. Except when exempted by Subsection B., below, this Section applies to trees within the City of Portland and trees on sites within the County Urban Pocket Areas in the following situations:
a. On sites. Development activities with ground disturbance or a construction staging area greater than 100 square feet on unpaved portions of the site where there are Private Trees 12 or more inches in diameter and/or City Trees 6 or more inches in diameter and the site:
(1) is 5,000 square feet or larger in area; and
(2) has existing or proposed building coverage less than 85 percent.
b. In streets. Development activities with ground disturbance or construction staging not limited to existing paved surfaces where there are Street Trees 3 or more inches in diameter.
2. Any Heritage Trees and trees required to be preserved through a land use condition of approval or tree preservation plan cannot be removed using the provisions in this Chapter, but may be counted toward the tree preservation requirements of this Section.
B. Exemptions. The following are exempt from the tree preservation standards of this Section:
1. On portions of sites located within an IH, IG1, EX, CX, CS, or CM zone.
2. Trees that are dead, dying, dangerous, or a nuisance species, as documented in a Tree Plan per Subsection 11.50.070 B. These are subtracted from the total number of trees to be addressed by the standards.
3. Trees exempted from this standard by a land use decision.
4. Tree preservation requirements approved in a land division or planned development review under Title 33, Planning and Zoning and the requirements of that review are still in effect.
5. Repair and replacement of existing fences and decks that are not changing in footprint or length when no trees are to be removed as a part of the project.
C. Tree Preservation Requirement. Any trees preserved shall be protected in accordance with the specifications in Section 11.60.030. The regulations for Private Trees in Subsection 11.50.040 C.1. sunset after December 31, 2019. After December 31, 2019 the regulations in effect will be those in effect on January 1, 2015.
1. Private Trees.
a. General tree preservation.
(1) Tree preservation is not required for development activities within 10 feet of existing primary structures, garages, or detached accessory structures permitted as living space if the submitted tree plan confirms the following:
(a) Tree removal is not a part of the project; and
(b) Ground disturbance will not occur in the root protection zone of any existing tree on site, as defined in Subsection 11.60.030 C.1.a.
(2) Retention. An applicant shall preserve and protect at least 1/3 of the non-exempt trees 12 inches and larger in diameter located completely or partially on the development site, unless mitigation occurs per Subsection 11.50.040 C.1.a.(2) below. Retaining trees at least 6 and less than 12 inches in diameter that are documented in a report prepared by an arborist or landscape professional to be Garry Oak (Quercus garryana), Pacific Madrone (Arbutus menziesii), Pacific Yew (Taxus brevifolia), Ponderosa Pine (Pinus ponderosa), or Western Flowering Dogwood (Cornus nuttallii) species are not included in the total count of trees on the site but may be used toward meeting the preservation standard.
(3) Mitigation. For each tree not preserved and protected below the 1/3 requirement, payment to the Tree Planting and Preservation Fund is required as shown in Table 50-1. The fee is calculated using the per-inch Restoration Fee for Tree Removal in the adopted fee schedule for Title 11. In cases where more than one tree is proposed for removal in excess of that allowed by Subsection 11.50.040 C.1.a.(1), the mitigation payment required to meet the 1/3 retention standard is based on the largest tree or trees proposed for removal.
Size of Tree Removed (inches in diameter)
At least 12 and less than 20
The cost of (2) two-inch diameter replacement trees
At least 20 and less than 36
The cost of (4) two-inch diameter replacement trees
At least 36 or more
The cost per inch of tree removed
b. Preservation of trees 36 inches or greater.
(1) Retention. An applicant shall preserve and protect all non-exempt trees 36 inches in diameter or greater located completely or partially on the development site, unless mitigation and notice occurs per Subsections 11.50.040 C.1.b.(2) and 11.50.040 C.1.b.(3), below. Retention or mitigation of these trees may also be used to meet the standards for general tree preservation in Subsection 11.50.040 C.1.a. above.
(2) Mitigation. For each tree 36 or more inches in diameter not preserved and protected, payment to the Tree Planting and Preservation Fund is required as shown in Table 50-1. The fee is calculated using the per-inch Restoration Fee for Tree Removal in the adopted fee schedule for Title 11.
(3) Notice. If a tree 36 inches or greater in diameter is not preserved and protected as allowed by Subsection 11.50.040 C.1.b.(2) above, the property owner or the property owner’s representative must post a notice on the site and send a notice to the recognized Neighborhood Association and District Coalition in which the site is located. The notices are for notification purposes only. The notices do not provide for public comment on the proposal or for appeal of the proposal. The property owner or the property owner’s representative must provide a signed certification to the Bureau of Development Services that a notice was posted on the site and a notice was sent to the Neighborhood Association and District Coalition. The development permit may not be issued until the business day following the day the notification period is completed.
(a) The posted notice must:
(i) Be posted on the site for at least 45 calendar days prior to development permit issuance;
(ii) Be posted within 10 feet of the street lot line nearest the tree or trees to be removed;
(iii) Include the date of posting and the date of the end of the notification period;
(iv) Include a site plan at least 8.5 x 11 inches in size showing the location and description of the trees(s) to be removed including diameter inch size(s); and
(v) Include contact information for the property owner or the property owner’s representative.
(b) The notices to the Neighborhood Association and District Coalition must:
(i) Be e-mailed or mailed to the Neighborhood Association and District Coalition using the contact information maintained by the Office of Neighborhood Involvement. If mailed, the notice must be sent via certified or registered mail. The date of the e-mail or the mailing must be at least 45 calendar days prior to development permit issuance;
(ii) Include a description of the trees(s) to be removed including diameter inch size(s); and
(iii) Include contact information for the property owner or the property owner’s representative.
(4) Exemption of tree preservation mitigation payments for affordable housing developments. Projects are exempt from the mitigation requirements in Subsection11.50.040 C.1.b.(2) if the development will be an affordable housing development approved for system development charge exemptions under Section 30.01.095. The amount of the mitigation exemption shall be pro-rated to a percentage equal to the percentage of dwelling units on the development site that are approved for the systems development charge exemption in Section 30.01.095. The Director of the Portland Housing Bureau may adopt administrative rules for the administration of Subsection 11.50.040 C.1.b.(4).
c. Exception for Capital Improvement Projects. Trees on private property that are part of a capital improvement project and within the development impact area are regulated as City and Street Trees.
2. City and Street Trees.
a. Retention. For development on City owned or managed sites, new public streets, or improvements to existing streets, applicants are required to consult with the City Forester at the preliminary project design phase if City or Street Tree removal is likely to occur to complete the project. The purpose of this consultation is to identify potential impacts and opportunities to retain existing trees, as well as any measures required to protect trees on site, on adjacent sites, or in the street.
b. Mitigation. Any required mitigation specified below shall occur on the site, in the street planter strip, or in the same watershed either by planting or a payment into the Tree Planting and Preservation Fund. The City Forester may reduce or waive the following mitigation requirements.
(1) Approved Street Tree removal in conjunction with improvements to partially or fully unimproved streets. Each tree at least 12 inches in diameter that is allowed to be removed shall be replaced with at least one tree. Trees planted to meet Street Tree Planting Standards will be credited toward meeting this requirement.
(2) Any other Street or City Tree allowed to be removed that is 6 or more inches in diameter shall be replaced with at least one tree in addition to trees required to meet required tree density or Street Tree planting standards.