2020 Map of Ayer Spring

About this map

Pennel Cr and its tributaries define the drainage patterns across this section of the eastern Montana plains, where the boundaries of Fallon, Custer, and Prairie counties converge. The landscape is characterized by the branching coulees of Pine Cr and Dry Fork Cr, reflecting a topography shaped by intermittent waterflow in a semi-arid environment. Human activity is marked by a sparse network of rural routes, including Riley Trl and Westmore Rd, which provide access through the sprawling sections of T10N and T9N. This 2020 survey captures the area's enduring character as open rangeland, where the primary spatial organization remains the Public Land Survey System grid and the natural contours of the creek beds.