CORVALLIS, Ore. -- No. 5 Oregon concluded the Pac-12 regular season by blowing out rival Oregon State in the second half of a 48-24 victory in the 116th Civil War Game on Saturday.
The win kept alive, for a few hours at least, Oregon's hopes of defending its Pac-12 Conference championship. The Ducks also needed a UCLA victory over Stanford in a game player later Saturday to earn a berth in the conference title game.
Midway through the third quarter it was a close game, with Oregon (11-1, 8-1 Pac-12) holding a 20-17 lead after the Beavers' Storm Woods second rushing touchdown.
The contest got testy on the next series. De'Anthony Thomas was hit and driven backward, and he was flagged for a personal foul for stomping his foot on Oregon State's Jordan Poyer.
Two plays later, Thomas ran for 12 yards and had the ball stripped out of his hands, but he was ruled down before the fumble. The Ducks kept rolling and Thomas scored from six yards out to put his team up 27-17 with 6:59 to go in the quarter.
Oregon State then fumbled the ball on the ensuing kickoff and Oregon recovered. The Ducks took advantage of the miscue and Thomas scored on a 29-yard run with 5:15 to go in the quarter.
The Beavers (8-3, 6-3) continued to implode as quarterback Sean Mannion threw three interceptions, and receiver Markus Wheaton muffed a diving attempt to catch a punt.
Oregon State, which is No. 15 in this week's BCS standings, has lost three of its last five games after rising as high as No. 7 in the AP poll.
The Ducks rebounded from its first loss of the season last week against Stanford and piled up 430 rushing yards. Thomas finished with 122 yards and three touchdowns on 17 carries.
Oregon running back Kenjon Barner left the game in the second quarter with an apparent rib or abdominal injury, but he came back in the third quarter and scored his second touchdown of the game. He had 198 rushing yards on 28 carries.
Marcus Mariota was sensational in his first Civil War appearance, completing 17 of 24 passes for 140 yards and also running for 85 yards on eight carries. He also kept Oregon drives alive by converting five of six times on fourth down.
Notes: Oregon improved to 60-46-10 in its series with Oregon State, the longest running college rivalry west of the Rocky Mountains. ... The Ducks won their 15th straight road game, the longest streak in the nation. ... Oregon State receivers Wheaton and Brandin Cooks both topped 1,000 yards for the season, becoming the first duo to do it for the Beavers since 2003. ... Oregon State still has one regular-season game left, next week against visiting Nicholls State. The game was originally scheduled for Sept. 1 but postponed because of Hurricane Isaac.