Check out the swell on this river. What a fun looking spot. Even have their own weather forecast setup.http://greatwindsurfingvideos.com/katie-weather-channel-windsurfing-part/
The Columbia River ain't no ordinary river. Its a great windsurfing destination. The wind goes up river so you have no trouble keeping upwind. I sailed there about 15 years ago for a few days and absolutely loved it. It was a really friendly scence there.
Here is some footage Konosurfer posted on the Vic forums of the same place. Check the jumps at the end!