The Jocko River (Salish: nisisutetkʷ ntx̣ʷe ) is a roughly 40-mile (64 km) tributary of the Flathead River in western Montana in the United States. It rises in the foothills of the Rocky Mountains and flows west into the Flathead at Dixon. The elevation is 2,503 feet (763 m) where it joins the Flathead. It is also known as Jacques Fork, Jim’s Fork, Prune River or Wild Horse Creek.