1967 Map of Big Marys Island

About this map

Big Marys Island sits within a prominent bend of the Yellowstone River, serving as a central landmark in this 1960s landscape. The area is defined by the transition from the river bottomlands to the eroded breaks of the Montana plains, characterized by deep incisions like Devils Gulch and Lost Cabin Coulee. Transportation and irrigation infrastructure dominate the river valley, where the Pacific Northern and Clark Canal Trail and the Burlington Northern railroad parallel the water.