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1966 Map of Jumbo Mountain

Name: 1966 Topographic Map of Jumbo Mountain
Creator: U.S. Geological Survey
Published: 1987
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1987

About this map

The Continental Divide serves as the high-altitude spine of this 1966 survey, marking the jagged boundary between Lemhi Co, Idaho, and Beaverhead Co, Montana. This high-country landscape within the Beaverhead National Forest and Salmon National Forest is defined by a network of drainage basins and peaks, including the prominent Jumbo Mountain and Squaw Mtn. Human presence is largely limited to traditional transit and light industrial activity, evidenced by a series of Pack Trails and a Jeep Trail that navigate the steep contours.

Resource extraction and recreation appear in remote pockets, such as the Slag-a-melt Mine near the southern border and a Campground situated along the shores of Twin Lakes. The drainage patterns are intricate, with Big Lake Creek and Sawmill Creek feeding the lower elevations, while alpine features like Ovis Lake sit tucked beneath the high ridges. This map captures the intersection of state lines and watershed divides where the only infrastructure consists of primitive trails and isolated mining claims.