On which American rivers could someone go white water rafting?

??????

But the best rafting in the world is in the Ottawa valley, Canada.
google one of the main rafting companies on the river such as:

1. Wilderness Tours
2. Owl Rafting
3. Esprit
4. River Run

and also search Buseater on you tube,
the most insane rapid on the Ottawa river,
a continuous wave that grows up to 10 ft (3 M) high!