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The Tualatin River, located in the state of Oregon, has a popular whitewater river run known as the "Whitewater Stretch." This segment of the river has a class rating of II-III and spans approximately 6 miles from Cook Park to West Linn.

The ideal streamflow range for this section of the river is between 500-1,000 cfs, although it is still runnable at higher levels. The river rapids and obstacles include several Class II and III rapids, including "Dimple Rapid," "Lava Falls," and "Bob's Falls." There are also some submerged logs and rocks that can pose a hazard to paddlers.

In terms of regulations, the Tualatin Riverkeepers organization has outlined specific guidelines for paddlers on the river. These include respecting private property along the river, avoiding disturbing wildlife, and practicing Leave No Trace principles. There are also rules in place regarding the use of personal watercraft and alcohol consumption on the river.

Overall, the Tualatin River Whitewater Stretch is a popular destination for paddlers seeking a moderate whitewater experience in the state of Oregon. It is important for paddlers to be aware of the ideal streamflow range, class rating, specific rapids and obstacles, and regulations in the area to ensure a safe and enjoyable experience.