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1985 Map of Upper Glaston Lake

Name: 1985 Topographic Map of Upper Glaston Lake
Creator: U.S. Geological Survey
Published: 1985
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1985

About this map

Upper Glaston Lake and Lower Glaston Lake anchor this 1985 survey of the Sweet Grass County interior, reflecting a landscape managed for water control and ranching. The presence of the Upper Sweet Grass Canal and the Lower Sweet Grass Canal underscores the systematic irrigation efforts designed to divert flows from the Sweet Grass Creek drainage. These artificial waterways cut across a terrain otherwise defined by natural drainages like Rock Creek, Cayuse Creek, and Dead Beaver Creek.

The western portion of the quadrangle is marked by the Franklin Hills, providing elevation above the creek beds and seasonal waters of Alkali Creek. Human activity is noted at the Picnic Area near the lake shores and a Gravel Pit near the northern reaches of Sweet Grass Creek, while Cottonwood Springs offers a rare named point of naturally occurring water in the central hills. The map captures the region before any significant modern development, focusing on the hydraulic infrastructure and rural landmarks like Tangen Draw.