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The City of Portland, Oregon

Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

MAILING ADDRESS: 1120 SW 5th Ave, Room 1000, Portland, OR 97204

More Contact Info

Construction Methods

Sewer Pipes

The contractor will use open cut trench construction to install pipe for this project, which includes these steps:

  • sawcuttingSaw cut pavement, dig trench, install shoring 
  • Install sewer pipe and backfill with sand and gravel
  • Excavate and replace sewer laterals to the curb
  • Restore surface temporarily with an asphalt patch
  • Complete final paving

Green Streets

Green street construction typically involves these steps:

  • Saw cut and remove pavement, excavate and place concrete forms for curbs and walls
  • Pour concrete and let set
  • green street constructionRemove concrete forms and excavate to final depth
  • Add and level soil
  • Add protective matting, if needed
  • Plant vegetation – this will happen in spring or fall when plant survivability is more certain

The city locates green street planters where they are most effective and have the least impact on parking. The city considers street and planting strip widths, and the location of underground utilities, street trees and driveways when designing these projects. Based on these site constraints, the city will build some green stormwater facilities in streets adjacent to curbs.

The Clinton Street Project will remove an estimated 40 on-street parking spaces, spread across the project area. The city has notified property owners where stormwater facilities will remove parking.

Pervious Paving

Pervious pavement is made of either asphalt or concrete. Both resemble conventional materials, but have more air spaces allowing water to pass through the pavement into a reservoir base of crushed aggregate and then soak into the ground. Construction includes these steps:

  • Remove existing pavement
  • Prepare road base and pour pervious concrete
  • Traffic on the street will be prohibited until the concrete cures, which will take several days.