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1985 Map of Thunderbolt Creek

Name: 1985 Topographic Map of Thunderbolt Creek
Creator: U.S. Geological Survey
Published: 1986
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1986

About this map

The Continental Divide winds through this high-altitude landscape of the early 1980s, marking the hydrological boundary between the Helena National Forest and Deerlodge National Forest. This montane region is defined by its series of towering summits, including Electric Peak, Thunderbolt Mountain, and Cliff Mountain, which overlook a network of deep drainages. Mining activity is evident through numerous identified prospects concentrated near Finn Gulch, Alta Gulch, and the Boulder River, hinting at the geological explorations that have long characterized the Powell and Jefferson County border.

Water resources are abundant, from high-elevation basins like Cottonwood Lake and Cliff Lake to the headwaters of the Little Blackfoot River and Red Rock Creek. A Pack Trail and the remote Ladysmith Campground offer the only significant evidence of human passage through the wooded slopes and meadows of Berkin Flat. The map provides a detailed look at the resource-rich terrain before modern development, recording the complex system of gulches and peaks at the roof of the Rockies.