Naked Ad when river flush hits

[Burdzthewurd]

Omaha Hi $0.50-$0.50 PL (real money)

Seat 2: UTG+1 ($56 in chips)
Seat 3: MP ($16.25 in chips)
Seat 6: CO ($17.25 in chips)
Seat 7: Button ($20 in chips)
Seat 8: Hero [2 [img]/images/graemlins/club.gif[/img],A [img]/images/graemlins/diamond.gif[/img],10 [img]/images/graemlins/club.gif[/img],2 [img]/images/graemlins/spade.gif[/img]] ($39.75 in chips)
Seat 9: BB ($62.25 in chips)
Seat 10: UTG ($48 in chips)

PRE-FLOP
UTG folds,4 calls, Hero checks, BB checks.

FLOP [board cards 10 [img]/images/graemlins/heart.gif[/img],8 [img]/images/graemlins/diamond.gif[/img],2 [img]/images/graemlins/diamond.gif[/img] ]
Hero bets $2, BB folds, UTG+1 calls $2, MP folds, CO folds, Button folds.

TURN [6 [img]/images/graemlins/spade.gif[/img] ]
Hero bets $4, UTG+1 calls $4.

RIVER [4 [img]/images/graemlins/diamond.gif[/img] ]
Hero...

UTG+1 is somewhat solid, haven't seen him chase down worse than 2nd nuts, will make a weak value bet with two pair/trips on river, will not pot it without stone nuts. Is a big bet ok here if I know he's not chasing and calling with junk like a Q or J-high flush or straight?