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2020 Map of Big Sag

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

USGS Topo · Published 2020

About this map

The Highwood Mountains dominate the southern half of this landscape, rising to prominent peaks like Gossack Mtn and Harris Mtn. This high-altitude terrain is carved by a complex network of drainages, including Keaster Cr, N Gap Cr, and S Gap Cr, which flow northward toward the lower plains. In the valley below, the Upper Highwood Cem sits near the headwaters of Highwood Cr, offering a point of interest for those tracing family history in Chouteau County.

The northern portion of the map transitions into the broad depression known as Big Sag, featuring Big Sag Lake and Spring Coulee. A network of rural roads such as Gap Rd and Highwood Rd connects these isolated geographic points, while the Highwood Creek Bridge provides a vital crossing in the southwest. This area reflects a classic Montana ranching landscape, where name-labels like Swan Ranch Ln suggest the sprawling landholdings that define the region's modern spatial organization.