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The Tualatin is an 83 mile long river that is a tributary of the Willamette River located in Oregon . The river drops 1,800 feet in elevation during its first 12 miles and then only an additional 250 feet  for the remainder of its course. This creates a slow river for the majority of the course, creating problems with pollution. Pollution reached a point that in 1989 local agencies were forced to begin cleaning up the river after the Tualatin failed water quality standards outlined in the Clean Water Act of 1972. It was the first river in the state to fail overall pollution limits.