Fort Berthold Indian Reservation

The Fort Berthold Indian Reservation is a U.S. Indian reservation in western North Dakota that is home for the federally recognized Mandan, Hidatsa, and Arikara Nation, also known as the Three Affiliated Tribes. The reservation includes lands on both sides of the Missouri River.

Created in 1870, the reservation is a small part of the lands originally reserved to the tribes by the Fort Laramie Treaty of 1851, which allocated nearly 12 million acres (49,000 km²) in North Dakota, South Dakota, Montana, Nebraska and Wyoming.

The reservation is located on the Missouri River in (in descending order of reservation land) McLean, Mountrail, Dunn, McKenzie, Mercer and Ward counties. The reservation consists of 988,000 acres (4,000 km²), of which 457,837 acres (1,853 km²) are owned by Native Americans, either as individual allotments or communally by the tribe. The McLean National Wildlife Refuge lies within its boundaries.

The Four Bears Bridge, which opened in 2005 replacing the original 1955 Four Bears Bridge, provides access across Lake Sakakawea.

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