Help identifying this trout?

Having troubles identifying this trout that was caught on a high elevation lake in the Colorado Rockies today.

There were no speckles on the fish except for medium sized faint spots along the tail end. Otherwise very silver with a pink streak along the body and pink cheeks. (Sorry for the poor photo, it was a screenshot from a catch/release video my friend did for me). Some have said perhaps a steelhead, salmon, or a weird variation of a rainbow.