Environmental Rules in Gresham, OR (2026)
5 verified environmental rules for Gresham, Oregon, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
Gresham owns and operates its public stormwater system as a city utility funded by recurring user charges, and requires property owners who alter runoff to build and maintain private stormwater facilities.
Gresham Stormwater System Rules
Some RestrictionsGresham Revised Code § 3.20.035
The council declares its intention to acquire, own, construct, reconstruct, equip, operate, regulate, and maintain within the city limits, and outside the city limits when consistent with the council's adopted policies or intergovernmental agreements, a public stormwater system, and to require persons responsible to construct, reconstruct, maintain, and extend the public stormwater system. (2)...
Erosion Control
Gresham requires approved grading and drainage plans, Building Code Appendix J compliance, and a stormwater report before construction on any development adding 1,000 square feet or more of impervious surface.
Gresham Grading and Stormwater Permit Rules
Some RestrictionsGresham Community Development Code § 9.0502
Unless otherwise specified in this document, Appendix J of the current edition of the Building Code shall apply to all grading and drainage construction on private property. For any proposed development that will include public facilities, a site plan showing grading, drainage, erosion control, and the other information detailed in the Stormwater Management Manual shall be approved prior to sta...
Flood Zones
Any development within Gresham's Floodplain Overlay District needs a floodplain development permit from the Community Development Manager, reviewed under a Type II procedure: a standard building permit alone does not satisfy this separate requirement.
Gresham Floodplain Development Permit Rules
Some RestrictionsGresham Community Development Code § 5.0104
The Manager is hereby appointed to administer, implement and enforce this Section (Floodplain Overlay District) by granting or denying development permits in accordance with its provisions. Permits shall be required as provided in Section 11.0101 and Section 11.0204. Exemption from building permit does not exempt a development from requiring a floodplain development permit. 1. An application fo...
Boat Dock Permits
Gresham requires a separate building permit before anyone builds, alters, moves or removes a dock, moorage, marina or other floating structure on city waters.
Gresham Floating Structure Permit Rule
Some RestrictionsGresham Revised Code § 10.60.040(2)(a)
It shall be unlawful for any person, firm or corporation to erect, construct, enlarge, alter, repair, move, improve, remove, or convert any structure regulated by this ordinance, except as provided for herein, or cause the same to be done without first obtaining a separate permit for each structure from the building official as required by this ordinance. (b) Exemption from the permit requirem...
Flood Elevation Requirements
New and substantially improved homes in Gresham's Floodplain Overlay District must have their lowest floor built at least one foot above the base flood elevation, the city's mandatory freeboard standard.
Gresham Flood Elevation Freeboard Rule
Some RestrictionsGresham Community Development Code § 5.0120(E)(1)
New construction and substantial improvement of any residential structure shall have the lowest floor, including basement, elevated to or above base flood elevation plus one foot. 2. Fully enclosed areas below the lowest floor that are subject to flooding are prohibited or shall be designed to automatically equalize hydrostatic flood forces on exterior walls by allowing for the entry and exit ...
Looking for Multnomah County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Gresham city rules.
Environmental Rules in Multnomah County →