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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

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North Mississippi Avenue Urgent Sewer Capacity Project

Updated October 11, 2019

Environmental Services – your sewer and stormwater utility – is designing a project on N Mississippi Avenue between Shaver and Fremont to replace approximately 600 linear feet of sewer pipe. This urgent sewer capacity project will replace and upsize a 100-year-old sewer main that is deteriorating due to age and is also too small for the area. The replacement and addition of new larger pipe will increase sewer capacity, alleviate basement sewer backups, street flooding, and help protect public health and the environment. 


Construction is tentatively scheduled for spring 2020.

N Mississippi Ave Sewer Capacity Project Map


In the coming weeks, crews will be in on Mississippi Avenue to locate and mark underground utilities by painting stripes on streets and sidewalks or placing colored flags in landscaped areas. Each color indicates what is buried below. Blue for water, yellow for natural gas, green for sewer, etc. Please visit for a list what each color indicates, and a description of activities that occur before the sewer work can take place.

For More Information

We will be sending periodic email updates to keep you posted on the construction schedule, and activities, including possible traffic detours, delays, and parking restrictions. Please sign up now to receive updates by emailing Debbie with “Mississippi” in the subject line.