This is a discussion on $200 NLHE Full Ring: Baby flush still good on river? within the online poker forums, in the Cash Game Hand Analysis section; Hero is (as usual) LAG table image, playing large stack (300bb+)
Villain is pretty new to the table, seems pretty solid imo. not much else on
Seems like you flipped positions with the BTN on the river somehow, so some combination of the action and your positions are wrong.
I assume you were in fact in the BB in this hand, which means you weren't able to "check back" the river because you would have checked before the BTN. And yes, I'm definitely checking out of position there after getting raised on the turn and the fourth spade peeling off. I'm not even that excited about being raised on the turn in the first place, because honestly this seems like exactly how the BTN could play better made flushes - particularly the king high flush combos.
That being said, I do somewhat prefer a check raise on the flop to a lead. I like that we're trying to get value, but I think we face a bet pretty often on the flop, we'll still get to control the action, and we may even be able to get it in against AXxs combos that have top pair and a spade draw (but are in objectively bad shape against our hand).