It is actually not a dumb question at all as it is a question that many biologists would love to pin down a definite answer.

Steelhead are the wanderers of our anadramous fishes as they have been found all over the northern half of the Pacific Ocean with very little rhyme or reason.

A year or so back, I saw some excellent data reffering to where steelhead were found in the Pacific Ocean. I wish I could remember the author and the title of that study as it was the best data I have seen in regards to this commonly asked but rarely answered question.