To Alaska by ferry from Washington State?

You would have to change Ferries in Juneau

Check here on the Alaska Marine Highway website.
http://www.dot.state.ak.us/amhs/

It looks like it would be possible.

The ferries are not a continuous trip. They stop along the way at Canadian towns. Why do you want to bypass Canada?

Maybe doesn't want to declare a wine collection?

The intent is not to just get to Alaska and ignore everything else. You should be booking the trip to get on and off of the ferry at every stop for 3 - 7 days and enjoy each port. Get off of your ferry and then catch the next one that comes through. You can do that - yes you can.

We've had our 40' DP on the ferry, it's relatively easy. Odds are you'll never see that route again, so take it ALL in and enjoy all of it. If you just want to get to Alaska, you'll still pay for the full trip, but you'll only be seeing or doing half of it.

Bill

We have a 45' coach and on our last trip we went from Bellingham, WA, just north of Seattle to Juneau, got off for a week, and then back on the ferry to Haines. Still had to drive through Canada to Alaska. Our first trip there we ferried out of Prince Rupert, BC. On our next trip in a couple years we are looking into ferrying back to Bellingham directly from Alaska and will probably not stop in Juneau on the way north.

Maybe Bellingham to Juneau to Whittier? As Murphsmon said, check the ferry schedule.

I think that even if the ferry stops in Canada but you don't get off you won't go through customs but check.

But be aware that there is a slim possibility of a ferry change or problem and you'll have to get off in Canada.

stickdog wrote:
Maybe doesn't want to declare a wine collection?

That's one possibility.

There is a in-transit procedure that allow an American citizen to transport tobacco, alcohol, etc through Canada to the United States. It involves paper work and declaring it at Canadian entry and exit and cannot be used in Canada.

I wanted to take a case of our favorite wine to Alaska but decided it wasn't worth the effort.

We did the opposite in the summer of 2015. We took the ferry from Juneau to Bellingham Washington. I remember four stops on the way south, none in Canada. I know you can take the ferry on the reverse trip to Alaska, but the times and stops may have changed. The advice to check the ferry schedule on line is spot-on. And, remember, your propane will need to be off for the entire time your rig is on the ship, so plan your refrigerated items accordingly. Also, if you have pets, they will need to remain in your RV for the duration of the trip, except for scheduled 15 minute pet breaks.

Have fun!