Marion County's zoning code regulates 'walls' under the same height limits as fences (MCC 17.117.080). A structural retaining wall over 4 feet high generally requires a building permit under Oregon's building code.
Marion County has no separate retaining-wall zoning chapter; walls are grouped with fences and hedges under the height rules in MCC 17.117.080 (up to 8 feet in yards, 48 inches within 10 feet of a street with vision clearance). Structural safety, however, is governed by Oregon's Structural Specialty Code, adopted statewide: a retaining wall generally needs a building permit once it retains more than 4 feet of soil measured from the bottom of the footing to the top of the wall, or when it supports a surcharge such as a driveway. Contact Marion County Building Inspection for engineering review, drainage, and setback questions before construction.
Building an over-height retaining wall without a required permit can bring a stop-work order, engineering correction requirements, and fines until brought into compliance.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Marion County's retaining walls rules stack up against other locations.
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