2014 Map of Nelson Island

About this map

Missouri River hydrologic patterns dominate this portion of Cascade County, where the river winds past Nelson Island and the community of Riverdale. The landscape is characterized by a series of drainages including Little Muddy Cr, Bird Creek, and Geyser Cr, which carve through the terrain toward the main river valley. Small rural settlements like Ulm and Chestnut Valley are connected by a network of established routes such as Old US Highway 91 and River Rd. Local history is anchored by the Castner Falls Cem, situated near Castner Coulee, providing a focal point for genealogical research in this region of Montana. The map illustrates the transition from the river bottomlands to the higher elevation plateaus marked by Lower Chestnut Valley.