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The City of Portland, Oregon

Portland Water Bureau

From forest to faucet, we deliver the best drinking water in the world.

Customer Service: 503-823-7770


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Join us for Cycle the Well Field on May 21

What local resource is capable of producing close to 100 million gallons per day of high quality drinking water, is the second largest water source in the State of Oregon, and is used as a secondary water supply for customers served by the Portland Water Bureau?

Answer: The Columbia South Shore Well Field! 

The Columbia South Shore Well Field is a series of 26 water supply wells located between the Columbia River and I-84, and stretching from I-205 in Portland all the way to Troutdale. Groundwater from the well field is used to supplement water from the Bull Run watershed during turbidity events or hot summer weather when water demand is greatest.

2015 Cycle the Wellfield group photo

On Saturday, May 21, 2016 from 8:45 am to 1:30 pm, the Portland Water Bureau and the Columbia Slough Watershed Council invite you, your friends and family aged 12 and up to take part in a yearly bike tour of this resource during the “Cycle the Well Field” event. 

Learn about the history, safety and functionality of Portland's underground drinking water system while pedaling over relatively flat terrain at a slow/moderate pace. Helmets are required and light refreshments provided. Bring water and a lunch to enjoy at Blue Lake Park.

Advanced registration is required for this free event. Please contact Karen Carrillo, Columbia Slough Watershed Council Outreach Director, at 503-281-1132 or register online


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