In the case that it was quite silvery, it was likely to be a kokanee. They color up like a sockeye during their spawing season, in september, but the rest of the year they are silvery like a small salmon in saltwater.

Oh, and you have to release all kokanee in Lake Sammamish.

Rob
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Give a man a fish, and you'll feed him for a day; give him a religion, and he'll starve to death while praying for a fish.