The Grant–Kohrs Ranch National Historic Site, created in 1972, commemorates the Western cattle industry from its 1850s inception through recent times. The original ranch was established in 1862 by a Canadian fur trader, Johnny Grant, at Cottonwood Creek, Montana (future site of Deer Lodge, Montana), along the banks of the Clark Fork river. The ranch was later expanded by a cattle baron, Conrad Kohrs (1866–1920). The 1,618 acres (6.55 km2) historic site (originally designated a National Historic Landmark in 1960) is maintained today as a working ranch by the National Park Service.

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