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If using a tow to Washington Island (did this last year), you check in at Prairie Portage.  We were dropped off at PP (Canadian side), so we could make the quick "portage" to the the Canadian ranger station for check-in (with RABC).  Then, our tow backed out and over to the truck portage (US side) to get the tow boat (and all of our gear) tranported into Inlet Bay (Basswood).  Then the tow boat (staying on the US side of Basswood), made the trip to Washington Island for our ultimate drop off.

On our return, we exited via PP, but you don't check with the Canadian rangers on the way out.  You'll need to stop just north of Ely to check-in with the US Customs.

dd