Is that a rainbow? I thought Pyramid had lahotans, or does it have both? Or am I thinking of a different lake.
I've caught lahotans in Washington where they have been planted but they are much more colorful than the fish in your picture.
Its a post spawn lahotan so color is kinda washed out plus warming water temps hurts their colors . Mist of these are the pilot peak strain of lohotan cutthroats.