1972 Map of Mortarstone Bluff

About this map

The Missouri River defines the northern landscape of this region, winding past the high elevation of Mortarstone Bluff and the small settlement at Riverside. This 1970s era topography shows a terrain deeply incised by countless drainage systems, including Eagle Nest Coulee, Simons Coulee, and Nicholson Coulee, which all feed toward the river valley. The map marks the Fort Peck Indian Reservation Boundary as it follows the river's path, separating the reservation lands from the grazing and agricultural areas to the south.