If you really want to know what's killing the steelhead just have Senator Murray go knock on the front door of Bangor sub base and ask the $750,000 question of "What did you do?" Obviously it's not the bridge it's what's on the other side of the bridge and that would be Bangor sub base. Or, the oxygen depravation of the water in conjunction with the toxic algae blooms has created a toxic soup that nothing should be able to survive in ... but my money is on the Navy did it.