Chico - $0.25 NL (6 max) - Holdem - 6 players

UTG: 107.04 BB
MP: 100 BB
CO: 137.2 BB
Hero (BTN): 100 BB
SB: 261.08 BB
BB: 100 BB

SB posts SB 0.4 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.4 BB) Hero has Jh 9h
fold, fold, fold, Hero raises to 2.4 BB, fold, BB calls 1.4 BB

Flop : (5.2 BB, 2 players) 6c 3c 9d
BB checks, Hero bets 3.68 BB, BB raises to 11.96 BB, Hero calls 8.28 BB

Turn : (29.12 BB, 2 players) 2d
BB bets 18.36 BB, Hero calls 18.36 BB

River : (65.84 BB, 2 players) 6h
BB checks, Hero bets 20.52 BB

Is the value bet on the river too thin once he checks back and all the draws miss?