Andre - yeah sure, rub it in
On the Green (King Co.) the summer fish hang out around the rocky pools in Geyser Park way into the spring even after spawning. Some of them are wild, and they get pretty voracious on their post-spawn period. When I got my bronco I started floating that stretch a lot and found that there were frequently summer fish holding thru that stretch in spring.
I remember on the Cow, many many fish hold along the inside of the bend looking downstream on the left bank - across from the landing. During summer, they like the boulders below the oxbow. In winter, they like the shoals above the oxbow. Like clockwork, past-prime fish stack up there in the late seasons.
The bogey down below Wilson's has a spot like that. It seems all the early fish back off down to this one long holding pool. I've caught very dark fish in February and March, one after the other and watched the boats go thru banging them too.
There's a pool on the Tolt where I landed four steelies in one winter afternoon where they all looked like summer fish.
I'd have to say that your observation has merit, there seem to be spots where long-term fish tend to like hanging out. Is there a creek mouth or other feature nearby?