The old Bay House is near Fort Vermilion. It was built in 1906 out of sawn lumber, and it was one of the first houses to be built of that material that far north.

The house is very close to the riverbank. It was originally part of a complex of buildings, which were a supply depot for the Hudson's Bay Company. They were in charge of providing provisions and collecting together the furs that had been purchased for shipping south and east.