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1963 Map of Mt. Arriva

Name: 1963 Topographic Map of Mt. Arriva
Creator: U.S. Geological Survey
Published: 1970
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1970

About this map

Cascade Crest marks the high-altitude divide of the northern Cascades on this survey, where the Okanogan National Forest and MT Baker National Forest meet. The landscape is defined by extreme relief and glacial features, notably the Lewis Glacier situated between Black Peak and Corteo Peak. High mountain passes such as Easy Pass, Horsefly Pass, and Heather Pass provide the primary transit corridors through these summits.

Water flows from the heights into basins like the Fisher Creek Basin and creates alpine catchments at Silent Lakes, Wing Lake, and Lewis Lake. The Cascade Crest Trail and various alternate routes wind through the terrain, tracing the boundaries between Skagit, Okanogan, and Chelan counties. This mid-century record documents the area's primitive trail system and wilderness state before significant modern changes in trail designations or environmental shifts affected the high-country glaciers.