Ferry to Haines? But it may have seasonal limitations that wouldn't work for you, or there may be weather cancellations, so maybe direct contact with local folks will tell you the winter situation.
Alaska Marine Highway System :: Official Site :: Alaska DOT&PF
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Q: Is it possible to drive to Haines in the winter?
A: Yes, the Haines Highway is well ploughed on both the Canada and USA side of the border. However it is wise to factor in the possibility of some delays in winter and always travel prepared to spend the night in your car (sleeping bags, food, water, etc)