[Nate.]

jk--

I don't think you can fold this river. Button's play is too consistent with a draw on the turn. (For the same reason, don't 3-bet; he'll never fold and obviously although you're ahead of a draw your equity isn't enough to 3bet for value vs. their ranges.) Anyway, Button's calling range on the river includes a ton of hands you beat (pocket pairs that are also straight draws are fit his action very well, although other stuff does too), and UTG's betting range does too. If you want to make some sort of read, be my guest, but I don't see how that read can be a combinatorial one.

--Nate