I took a ferry near Puget Sound on a road trip in 2018 - from Clinton to Mukilteo - is it Possession Sound? Genuinely just thought it was a regular sea crossing - I suppose looking again at the map that area is more like a river than a regular seaway.

The rain held off for the most part - although the greenery was spectacular compared to the other (?rain shadow) side of the Cascades. Lovely part of the world. Good you don't get the rust problem - same here in Scotland. In the sea lochs it isn't a problem - on the coast and islands on the other hand...... it's hellish!