Portland regulates grading and drainage through Title 10 (Erosion and Sediment Control), Title 17 (Public Improvements), and Title 24 (Building Regulations). Grading permits are required from the Bureau of Development Services for excavation or fill exceeding certain thresholds. All grading must maintain natural drainage patterns and prevent adverse impacts to neighboring properties.
Grading permits are required for cuts or fills exceeding 5 feet in depth or 50 cubic yards. Drainage must be managed so runoff does not adversely affect neighboring properties. The Stormwater Management Manual requires on-site management of drainage for qualifying projects. Portland's hilly terrain and high rainfall make grading and drainage particularly important. Sites in environmental overlay zones face additional restrictions.
Unpermitted grading can result in stop-work orders, fines, and required site restoration. Diverting drainage onto neighboring properties creates civil liability and potential code enforcement action. BES can require corrective measures for drainage problems caused by unpermitted grading.
Portland, OR
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See how Portland's grading & drainage rules stack up against other locations.
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