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2020 Map of Nelson Island

Name: 2020 Topographic Map of Nelson Island
Creator: U.S. Geological Survey
Published: 2020
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2020

About this map

Missouri River meanders through this portion of Cascade County, defining the local geography as it flows past Nelson Island and the small settlement of Riverdale. This area south of Ulm is characterized by its distinct drainage patterns and river-bottom lands, which have long supported the agricultural communities of Chestnut Valley and Lower Chestnut Valley. The map shows a transition from the riparian environment along the main channel to the higher, dissected plains marked by features like Castner Coulee.

Transportation corridors including Old US Hwy 91 and a network of local routes like River Rd and Castner Falls Rd connect the scattered homesteads. For those tracing local heritage, the Castner Falls Cem serves as a notable landmark near the eastern bluffs. Numerous watercourses, such as Little Muddy Cr, Bird Creek, and Geyser Cr, feed into the Missouri, illustrating the complex hydrology of the region.