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1950 Map of Angostura Reservoir

Name: 1950 Topographic Map of Angostura Reservoir
Creator: U.S. Geological Survey
Published: 1952
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1952

About this map

Angostura Reservoir dominates this landscape, reflecting a pivotal era of Missouri River Basin development in the early 1950s. The map captures the newly formed impoundment of the Cheyenne River, with the Angostura Dam Spillway 3198 positioned at the reservoir's northern neck. This infrastructure was part of a larger federal program to manage water resources in South Dakota, dramatically altering the local geography of canyons and draws.

To the west, the steep terrain of the Harney National Forest is deeply incised by features such as Adams Canyon, Sheps Canyon, and Green Canyon. Rural infrastructure is sparsely distributed across the plains and hills, including the Hot Springs Municipal Airport in the northeast and small local landmarks like Coleman Sch and Lithia Sch. Significant elevation changes are marked by Tepee Mountain and various named canyons, showing the transition from forest to the river valley floor.