I agree it all depends on the water they are stocked into and wether they will provide hospitable living conditions throughout the year, barring that a nice cold creek or other such body of water for them to flee into.
Take Harriet lake for example, they stock the crap out of that relatively small body of water but it stays ICE cold year round. Hold overs are common as long as they are smart enough to know that power bait is sure death.
Personally I avoid grown stockers, I love fishing lakes that ODFW plants with fingerlings that are than forced to get to size naturally. I think they fight and taste better. I recently went to my "secret" lake up near hood. first couple dozen casts yield nothing. I noticed that ever year the lake seems to be getting progessively shallower and I feared it may have finally winter killed. Start working towards were the original creek that flowed through the meadow was(distinguishable by the faintly darker section of water about 3-4ft wide) (lake creation courtesy of beavers) and first cast WHAM biggest trout I've had on my line in years(minus those huge southern browns) put up a great fight almost like a steel and just like steel I'm worried it's gonna spit the hook. Finally bring her in and she measures out to 14+ inches I can't believe it. This lake has consistantly yielded 8-10in's but nothing that big take some pics and cast out again. WHAM!! again same deal, huge hit, big fight, big trout almost the partner to the first but girthier. I ended up keeping those 2 and when cleaning them noticed one was a boy and the other a girl, mating pair perhaps?
Made me sad knowing I had removed 2 beautiful specimens from my favorite lake but I also know that only me and maybe another person or 2 have ever shown signs of going to this lake so hopefully it'll provide few more exciting fish in years to come.
Sorry for semi hijacking this thread. I had a fantastic day on my one day OFF last week, exploring, fishing, and did I mention there was a god damn BEAR. Tried to wait him out but ended up backing up what I thought was a fair distance and yelled at him to get his attention, I mean after all he was blocking my way to my secret lake! He was smallish and BROWN not black, but he lumbered away when he realized I was there.
Man I really gotta start posting my stories on my own threads..lol I have pictures too so it must be real!