WILLAMETTE BASIN COUNTIES

The Willamette River Basin contains all lands that drain in to the Willamette River, in other words the Willamette River watershed. Thirteen of the thirty-six Oregon counties lie within or intersect this natural boundary. The Willamette River Basin is about 180 miles long and 100 miles wide (290 by 161 kilometers), and encompasses 11,478 square miles (29,728 square kilometers), or 12% of the State of Oregon.