I haven't.... but somebody has!

If you look at the WDFW Steelhead Harvest Reports for the last few years on record http://wdfw.wa.gov/fish/harvest/harvest.htm
you'll see a few fish recorded during the summer months.

But are these really summer fish since there isn't any summer plants?
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'Tis a strange and bewildering place. Often, a steelhead will take on the first cast, and at other times, one can beat the water to a froth and swear a fish was nowhere near. --Bob Heirman