Try Arkansas & Tenn.
and a host of others....
It's mostly rain-driven to crank up the levels, last I knew, they were still in drought mode, but that may have changed and I haven't been following the weather patterns for that area
Just make sure you go with people who know those rivers if you hit them. Cossatot can be a mean mother at high flows (5.5' to 7+ feet on the gauge).
And the Lord said, let there be whitewater. So on Friday, the 13th day of the month....