Bob,

I'll give you a quick answer for now...

The waterways within the reservations are owned by the tribes, or perhaps more accurately, by the federal government and held in trust for the tribes.

They were given to the tribes by the federal government in the treaties that ceded land to the feds and created reservations for the tribes.

The equal footing doctrine has been used to fight treaty rights that pre-exist the creation of a state, and it hasn't worked yet.

Fish on...

Todd.