Our Watershed

A watershed is like a great big bowl linking land, water, and people. Our Tualatin River watershed drains 712 square miles and ranges from the densely populated areas of southwest Portland, Hillsboro, Tigard and Beaverton to agricultural areas near Scholls, Gaston, Banks, Mountaindale and North Plains to the forests of Oregon’s Coast Range, Tualatin Mountains and Chehalem Mountains. Most of the fast-growing urban population—approximately 542,000 residents—resides on 15% of the watershed’s area. Agricultural uses take up 35% and 50% of the watershed is forest.

Learn more about the Fernhill Wetlands Project and the Tualatin Basin Water Supply Project.

Our Watershed

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