Alaska advice

Has anyone ever went to Alaska by way of a ferry from Washington state, if so where did you board the ferry at, and where did you disembark. Is there any Canadian customs, if you go by way of a ferry? Would like to do the Alcan highway, but leaving in October roads might be unknown condition I know it is late in the year but we are going to support a dear one that is on a military base there. Thanks for your help sincerely