Tristan LeBaron returned a fumble 82 yards for a touchdown, but the Panthers could get much going on offense.
Washougal did not earn its initial first down until five minutes were left in the third quarter.
Aberdeen held Washougal to 60 yards rushing and 39 passing for the game.
Garrett Duey scored on a 26-yard pass from Brandon Bea in the fourth quarter.
ABERDEEN 29, WASHOUGAL 12
Washougal 0 6 0 6--12
Aberdeen 10 12 7 0--29
A -- Safety. Washougal ball-carrier tackled in end zone
A -- Veek Cheema 18 run (Bryceson Talley run)
A -- Talley 1 run (run failed)
A -- Filipo Cournoyer 10 pass from Cheema (run failed).
W -- Tristan LeBaron 82 yard fumble return (pass failed)
A -- Austin Floch 5 run (Sam Ruiz kick).
W -- Garrett Duey 26 pass from Brandon Bea (run failed)