Upper Willamette River Basin, Oregon (IMAGE) University of Oregon Caption This map depicts the Upper Willamette River Basin, from the origins of the McKenzie and Willamette Rivers to where their confluence north of Eugene-Springfield. Credit Map Developed by Ray Neff, 2009 Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.