Tough river call with low flush

Villain is 21/8/3 over 120 hands. Seems pretty solid, hasn't done anything crazy.

Party Poker No-Limit Hold'em, $ BB (6 max, 5 handed) FTR converter on zerodivide.cx

saw flop|<font color="#C00000">saw showdown</font>

SB ($39.85)
BB ($184.15)
UTG ($95.90)
MP ($50)
Hero ($186.10)

Preflop: Hero is Button with 8[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/heart.gif[/img]. SB posts a blind of $0.50. MP posts a blind of $1.
<font color="#666666">1 fold</font>, MP (poster) checks, Hero calls $1, SB (poster) completes, BB checks.

Flop: ($4) 5[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, BB checks, MP checks, <font color="#CC3333">Hero bets $3</font>, SB folds, BB calls $3, MP folds.

Turn: ($10) 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets $9</font>, <font color="#CC3333">BB raises to $25</font>, Hero calls $16.

River: ($60) 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $58</font>, Hero ???

What do I do here?