I would add to Smalma's remarks that there can be a lot of coho smolts in the streams and many anglers really don't know or care about the difference. Note the amount of times coho have shown up in OD lake fisheries. But, I have seen the peak of coho smolt migration be after Memorial Day and have collected coho smolts on their way out as late as July 1. Nice big smolts, lake-reared. I forget if we got any steelhead that late.