The Tualatin River is a tributary of the Willamette River in Oregon in the United States. The river is about 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. Source: Wikipedia
Maximum discharge on the river today is recorded at the Tualatin River At West Linn with a streamflow rate of 605 cfs. However, the deepest point on the river is located at the Tualatin River Near Dilley reporting a gauge stage of 10.25 ft. This river is monitored from 2 different streamgauging stations along the Tualatin River, the first of which is perched at an elevation of 168 ft, the Tualatin River Near Dilley .