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The City of Portland, Oregon

Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Ave, Suite 613, Portland, OR 97204

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Happy Birthday to the Clean Water Act!


The Clean Water Act celebrated its 40th anniversary on October 18. The groundbreaking legislation regulated pollution sources and strengthened water quality standards and basically revolutionized how we protect our rivers and streams.

How has the Clean Water Act helped improve the Willamette River? Over the last several weeks, American Rivers has published a series of articles about the Clean Water Act through the generations, starting with a video of Willamette River conditions in the 1930s and 1940s: 

Video footage courtesy of Earthfix via Oregon State University Archives

The Oregon Department of Environmental Quality required Portland to control overflows of combined sewage and stormwater to the Columbia Slough and the Willamette River. Over 20 years, the city completed a series of projects to virtually eliminate combined sewer overflows (CSOs) to the slough and reduce Willamette River CSOs from an average of 50 a year to no more than four per winter and one every third summer.

The CSO program also spurred Portland’s efforts to keep stormwater runoff out of sewers. The city has become a leader in innovative green infrastructure approaches that use plants and soil to mimic natural conditions and allow rain to soak into the ground as soil and plants filter pollutants.

Oregon Public Broadcasting has been focusing on green infrastructure techniques this week, showcasing excellent examples from Portland and Seattle, and asking If Green Roofs and Rain Gardens Are So Great, Why Aren't There More?

Video footage courtesy of Earthfix 

Why is all of this important? Well, look at water quality in the Willamette now. Athletes in the annual Portland Triathlon swim the Willamette. Events like the Big Float are getting people back on the river, and when they do they see first hand just how clean our river is. There's still much to do, but the Willamette River has come a long way and is an even more valuable resource for the people, fish and wildlife that depend on it. 

Stephens Creek Confluence 


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