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The City of Portland, Oregon

Development Services

From Concept to Construction

Phone: 503-823-7300


1900 SW 4th Ave, Portland, OR 97201

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Rainy Season Construction Site and Erosion Control Measures

City of Portland, Bureau of Development Services

November 20, 2015


Contact: Ross Caron, Bureau of Development Services 503.823.4268 

Now that the rainy season is upon us, ground-disturbing work on all properties located in the Balch Creek and Forest Park Subdistricts of the Northwest Hills Plan District must end. Exposed earth was required to be covered and stabilized no later than October 1st. All construction activity, including sewer, water and utility trenching which exposes soil to stormwater is prohibited between October 1st and April 30th in the Balch Creek and Forest Park Subdistricts. Call the Planning & Zoning section of the Bureau of Development Services, 503-823-7526 with questions.
Projects in other areas of the City must comply with Title 10 Erosion Control Regulations. In most cases, construction activity may continue, but wet weather erosion control measures are required between October 1st and April 30th including logging daily inspections of erosion control measures and providing temporary ground cover on exposed soils and stockpiles. A few additional requirements to note include: 

  • All site development, construction, and demolition sites are required to post the Erosion Concerns Hotline signage at a location that is readable from the public-right-of way.
  • You must complete an erosion control inspection log and have it available onsite. 

The rainy season is a great time to brush up on your erosion control knowledge, take time to review the City’s Erosion and Sediment Control Manual or download it for quick reference on-site. If your construction team would benefit from erosion control training or a refresher course, check with these or other training providers: 

  • Northwest Environmental Training Center (
    • CESCL: Certified Erosion and Sediment Control Lead Training
    • Re-CESCL: Erosion and Sediment Control Lead Re-Certification
  • Southwest Washington Contractors Association (
    • Erosion Control (CESCL) Certification