Wide receiver Victor Bolden rushed for 111 yards on three carries, including a 92-yard touchdown run in the third quarter for the Beavers (1-1), the second-longest in Oregon State history.
''Wow, that was some Pac-12 right there,'' Idaho State coach Mike Kramer said about Bolden's fly-sweep. ''As it happened, I was thinking, 'Let's go home. Let's go home.' "
Garretson, a transfer from Utah State who sat out last season under NCAA rules, scored on a 7-yard keeper and Ryan Nall added a 2-yard TD run as the Beavers ran up a 23-0 lead in the first half. Treston Decoud scored on a 75-yard interception return midway through the third quarter for the Beavers.
''It's definitely been too long since we won,'' said Oregon State safety Devin Chappell. ''We can't get too high on this win. But we're going to enjoy it tonight and then get back to work.''
Jakori Ford scored on a 75-yard run on the first play from scrimmage to open the second half for Idaho State (2-1). It matched the second longest offensive play for the Bengals since Mike Kramer became coach in 2011.
Ford finished with 122 yards on eight carries, Idaho State's Tanner Gueller threw for 227 yards but was intercepted four times. The Bengals also lost a fumble.
''We gained quite a few yards (363) but you can't turn the ball over five times in a game and expect to win,'' Gueller said. ''That's kind of the downfall this week. We'll try to look at in on film and learn from it.''
Idaho State is now 0-26 against FBS teams since beating Utah State in 2000.
(credit Anne Peterson & AP)