Stewart BC & Hyder Alaska are side by side. There is no US border checkpoint but there is a Canadian one. Residents of Hyder have a BC area code and their kids go to school in Stewart.
The Salmon Glacier is in BC north of Stewart, to get to it you drive into Hyder and drive north and at some point you cross back into BC.
This was one of the best glaciers I saw and the others that were comparable I had to fly over (Kluane) or take a boat tour (Kenai Fjords).