1970 Map of Lost Bridge

About this map

Lake Sakakawea dominates the northern landscape of this Dunn County region, marking the controlled inundation of the Little Missouri River valley. The map provides a detailed look at the Fort Berthold Indian Reservation Boundary as it intersects with the rugged topography of western North Dakota. To the south, the terrain rises toward North Killdeer Mountain, while the drainage of Corral Creek carves through the breaks. Geologic and recreational interests are highlighted by the Lost Bridge Public Use Area, situated where the river transitions into the reservoir. This 1970 field-checked survey preserves the character of the badlands terrain before further modern development, showing the isolated Spring and fence lines that defined local land use during this era.