Little White Salmon River: Fish Hatchery to Columbia River is a 4 mile trail located near Bingen, WA. The trail is primarily used for whitewater kayaking.
I use to live in a little Hatchry Housing called Cook for my entrie childhood, which is located right on it. I'm not a kayaker, but if I was I would never ride this one. Too many people have been enjured and died on it. I remember when I was eight or so a kayaker came up to our house and ask to use our phone, one of there friends broke their leg and was stranded in the middle of the river. From what I have read the rapids and falls go up to a Class III. There is lots of information on it on the web.