Piker..
The area chosen for spawning are silt free and are chosen by the fish as "quality" habitat for the survival of the eggs. I've read that often the redd areas have upwelling flow that keeps the water borne material from depositing. When the insect study was done in 2007, we excavated a riffle area <> a foot deep and found some fry more than 6" below the water surface.
Certainly there are silted area but these area are never used by trout for spawning. Unlike humans they seem to be a tad more selective of the areas to get it on.
Don
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