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1983 Map of Thumb Peak

Name: 1983 Topographic Map of Thumb Peak
Creator: U.S. Geological Survey
Published: 1983
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1983

About this map

The Mule Mountains and Palo Verde Mountains dominate this arid landscape along the border of Riverside Co and Imperial Co. In the early 1980s, this area remained largely defined by its geologic features and resource extraction, notably the Opal Hill Mine, which is recorded as an open pit operation near Coon Hollow. The terrain is marked by a complex network of ephemeral drainages, including the prominent Sand Wash and Dry Wash, which descend toward the eastern Palo Verde Mesa.

Transport through this desert environment relies on historic routes and utility corridors. The Bradshaw Trail skirts the northern boundary, following an established path across the gravel mesas and washes. Vital water sources like Clapp Spring are documented near the base of the prominent Thumb Peak. Modern infrastructure is represented by the Doublewood Pole Powerline and a strategically placed Radio Tower, while a Levee in the southeast indicates water management efforts on the mesa edge.