Tualatin River

The Tualatin River is a tributary of the Willamette River located in Oregon in the United States. The river is approximately 83 miles (134 km) long, and it drains a fertile farming region called the Tualatin Valley southwest and west of Portland at the northwest corner of the Willamette Valley. There are approximately 500,000 people residing on 15 percent of the land in the river's watershed.