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1960 Map of Mount Si

Name: 1960 Topographic Map of Mount Si
Creator: U.S. Geological Survey
Published: 1962
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1962

About this map

The North Fork Tolt River and its southern counterpart dominate the northern half of this landscape, managed as the Tolt-Seattle Water Supply Reservoir. This 1960 field-checked survey highlights the industrial and recreational footprint within the Snoqualmie National Forest, ranging from the small settlement at Ernies Grove to high-elevation extractive sites. The eastern ridges are marked by several mining operations, including the Lennox Mines, Apex Mine, and Blackhawk Mine, which are situated near Prospectors Ridge.

Infrastructure for forest management and public utility is evident through features like the Camp Brown Guard Station and the Weather Station near the South Fork Tolt River. A network of jeep trails and private roads provides access to the high peaks, including Mt Si and Bessemer Mtn. The terrain is characterized by numerous alpine water bodies such as Lock Katrine and Lake Elizabeth, reflecting a wilderness area transitioning into a critical municipal resource for the growing Puget Sound region.