Worked on a number of OP streams that had CT and SH. As I recall, we had only one place where we found hybrids. They were in about 10m of creek downstream of a small falls. Pure Ct above, pure SH below. I don't think we did genetics on them but they characters of both.

Another time I saw a presentation on fish ID. The pictures looked like pure CT or pure SH; genetics showed exactly the opposite. I think WDFW found the same sort of thing in some Lake WA tribs about a decade ago.

Amazing what we find when we look really closely.