Weird fish; any ideas?

[Gandalf]

Looks like a Catfish of some sort.

+1 This was my first thought as well. However, I also think the post above about the bug eyed koi may be correct as well. Seen from the back and in natural waters (i.e. not too clear, not like in a fish tank), I guess they could look like hammerhead shaped fish (clear water in a tank, as I have always seen them, you can't mistake them).

Now, if the OP had said they had seen this fish in Colorado, well ...

Paul