UB 2/4 set on scary board

[Case]

CO is 42/8/0.5 over 300. No other reads.

Ultimate Bet
Limit Holdem Ring game
Limit: $2./$4
5 players
Converter

Pre-flop: (5 players) Hero is SB with 8[img]/images/graemlins/diamond.gif[/img] 8[img]/images/graemlins/spade.gif[/img]
UTG folds, <font color="#cc0000">CO raises</font>, Button calls, Hero calls, BB calls.

Flop: 7[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/spade.gif[/img] 8[img]/images/graemlins/club.gif[/img] (8SB, 4 players)
Hero checks, BB checks, <font color="#cc0000">CO bets</font>, Button folds, Hero calls, BB folds.

Turn: 9[img]/images/graemlins/spade.gif[/img] (5BB, 2 players)
<font color="#cc0000">Hero bets</font>, CO calls.

River: T[img]/images/graemlins/club.gif[/img] (7BB, 2 players)
Hero checks, <font color="#cc0000">CO bets</font>, Hero calls.

Results:
Final pot: 9BB

Should I have c/r flop? Assuming flop as played, should I have c/r turn? What would you do on the river?