Moevao, the Beavers' starting quarterback in 2008, played only one down last season. First, he was slow to recover from shoulder surgery and then, once he returned to practice, he suffered a season-ending foot injury.
"We are all very disappointed in the outcome of Lyle's appeal for the sixth year," coach Mike Riley said in a statement. "We will of course miss him, both as a person and as a player on our team. He not only won a lot of games as our quarterback, including some of our biggest wins in history, but he also was the heart and soul personality in our program."
Moevao's appeal was denied, according to the school's statement, "due to him not demonstrating the loss of two seasons beyond his control, as defined by current NCAA legislation. Moevao redshirted in 2006 after transferring to OSU from El Camino Community College in California."
Moevao has already graduated with a degree in sociology. He will finish his career with an 11-4 record as a starter. He ranks seventh on the Beavers' all-time list for passing yards with 3,410.
Oregon State heads into spring practices, which start March 29, with four quarterbacks: sophomore Ryan Katz, junior Peter Lalich and redshirt freshmen Jack Lomax and Cody Vaz. Incoming freshman Sean Mannion will join the team in August.