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2017 Map of Iona

Name: 2017 Topographic Map of Iona
Creator: U.S. Geological Survey
Published: 2017
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2017

About this map

Iona anchors this section of Lyman County, positioned where the rolling uplands break toward the Missouri River basin. The landscape is defined by its topographic extremes, from the level expanse of Gozzard Flat in the north to the dramatic rising elevation of Twilight Butte and the Iona Hills further south. These landmarks provided essential orientation for early settlers navigating the open prairie of South Dakota.

Genealogists will find critical records of the community at the Saint Columba Catholic Cem and the nearby Iona Cem. The drainage patterns of Waterhole Cr and Nicholas Cr illustrate the vital water sources that dictated early land use and ranching boundaries in this region. The map also captures Lake Agnes, a small catchment nestled among the ridges, reflecting the local importance of even modest water bodies in this environment.