Question: Council Grove State Park is in the Montana county with what population as of 2010?
Sentence (from "Council Grove State Park"): The site of the park hosted the July 16, 1855 signing of the Hellgate treaty between representatives of the United States government and members of the Bitterroot Salish, Pend d'Oreille, and the Kootenai to make the Flathead Indian Reservation.
Relevant evidence: No