It seems to me that WDFW should manage for what the water will provide. As Salmo noted, the Lake Washington system is becoming less hospitable to anadromous fish. The Cedar is telling us the lacustrine rainbow, rather than anadromous, seem to function well, Then manage for them. One can manage the river to produce lake migrants and a fishery can be directed at the spawning run. Just need to know the timing of upstream migration. The fish should be over 20" and well worth pursuing.

At the same time I suspect the lake may be able to raise sockeye, just not anadromous ones that must traverse the Ship canal and locks a couple of times. That leaves Kokanee.

And, finally, as the lake continues to warm it will be a walleye lake but I think the resident salmonids can hang on for a while. Take what nature gives you.