Pot control takes a dump on my hand - 2/4 NL

[JrJordan]

CO has 25/10 stats, but I've only been at the table for two orbits with him. He's cold called twice so far when I open raised. Button is an unknown at this point.

PokerStars No-Limit Hold'em, $4 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Hero ($373)
CO ($400)
Button ($169.40)
SB ($99.05)
BB ($300)
UTG ($244.15)

Preflop: Hero is MP with K[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $16</font>, CO calls $16, Button calls $16, <font color="#666666">2 folds</font>.

Flop: ($54) K[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">CO bets $36</font>, Button folds, Hero calls $36.

Turn: ($126) Q[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, CO checks.

River: ($126) 2[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $60</font>, <font color="#CC3333">CO raises to $176</font>, Hero...


This flop is almost always an autobet, but I'm OOP on a pretty dry board vs. a guy who's cold called me in the two chances he's had. If a c-bet get's called, I'm in for a tough turn decision.

After the turn check through I make a blocking bet, though in retrospect I think c/c is a much better idea since it could induce a bluff and my block bet doesn't get much value from hands other than a turned Q.

That being said, what the hell is he representing with the river raise? No single pair can raise here and the only reasonable 2pair hands are 67 and KQ. 89 could be bluffraising the river when I make the half PSB. Did my play force me into a call on this river or do I just make the regular automuck?