Queets guy is onto something with the overall appearance loloking more like a steelhead. One feature that makes it look at least part cutt is that the maxillary (upper jaw) extends beyond a vertical line at the rear of the eye. Did you happen to look for the cutt marks? I've caught one or two that had yellowish cutt marks, rather than the red ones typical of cutthroats. My guess is hybrid, too. In any case, nice catch!