Loading map...

1922 Map of Island Mountain

Name: 1922 Topographic Map of Island Mountain
Creator: U.S. Geological Survey
Published: 1922
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1922

About this map

Trinity National Forest landscape dominates this tactical survey, defined by the rugged drainage basins of the Mad River and Eel River. The terrain is marked by a series of remote Ranger Stations, including Salt Ridge R.S. and Blair Cr. R.S., which served as the operational backbone for early forest management in Northern California. Small settlements like Zenia, Hoaglin, and Island Mountain are isolated by a network of steep canyons such as Cox Canyon and numerous mountain branches.

A significant boundary line, the 1st Standard Parallel South, cuts across the lower third of the quadrangle, bordering the Round Valley Indian Res. to the south. The distribution of features like Surveyor Springs and Lake Mountain suggests a landscape navigated primarily by pack trails and forest service outposts before the arrival of modern highway infrastructure. This era of mapping captured the area just as military engineers were refining the topographic details of the California coastal ranges.