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Saleesh House, also known as Flathead Post, was a North West Company fur trading post built near present-day Thompson Falls, Montana in 1809 by David Thompson and James McMillan of the North West Company. It became a Hudson's Bay Company (HBC) post after that company merged with the North West Company in 1821. Under HBC control the post was better known as Flathead rather than Saleesh. It continued to operate until at least 1855.