I don't know if there is such traffic going on nowadays - there doesn't seem to be much logging currently - but a few years back I knew a raft pilot who periodically pushed tremendous rafts of logs north to Haines (I think it was Haines, might have been Yakutat) where the Japanese collected the logs and took them home. I was told that the Japanese had huge stockpiles. The US then bought back the dressed lumber. This was in southeastern Alaska.