Yes, Green Peter is the closest...about 45 minutes one way. But, there is also Suttle Lake; about 1.5 hours away (which also holds LARGE browns). And there is Detroit Reservoir, also about 1.5 hours away.
If you want to shoot for a possible world record koke, Wallowa Lake is the place to go. Three consecutive state records have been harvested within the last 3 months. Plus, a possible new World Record was caught there on Sunday morning (breaking the state record again for the 4th time this year). It weighed in at 9.67 pounds, and was 27" long. The only downside is that Wallowa, is about 6 hours away from Corvallis.