
The Big Lost River carves a broad valley through this high-altitude landscape, anchoring a network of irrigation and industrial infrastructure. The town of Mackay serves as the central hub, supported by water-management systems including the Nielsen Ditch, Sharp Ditch, and Bench Ditch. Industrial history is prominent on the valley floor, evidenced by the Empire Smelter and several Gravel Pits, while an Old Railroad Grade traces the base of the mountains, marking the paths of former ore transport. To the north and east, the Challis National Forest rises toward rugged peaks like Mount McCaleb and Invisible Mountain, where numerous Prospects dot the drainages of Mahogany Gulch and Methodist Gulch. This 1991 revision also documents the community surroundings, from the Mount McCaleb Cem to the local Mackay Airport and the settlement of Houston downstream.
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This is the sole edition of this map. No revisions or reprints were ever made.
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