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1958 Map of Logan Ridge

Name: 1958 Topographic Map of Logan Ridge
Creator: U.S. Geological Survey
Published: 1978
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1978

About this map

Logan Ridge dominates this 1958 survey, forming a prominent north-south spine that divides the drainage systems along the border of Glenn and Colusa counties. To the west, the landscape is defined by the steep relief of the ridge and its associated valleys, including Grapevine Valley and the rugged catchments of Antelope Creek and Funks Creek. This western portion contrast sharply with the eastern lowlands, where the terrain flattens toward the Sacramento Valley.

Water management is the primary human footprint on this landscape, anchored by the Glenn-Colusa Canal and the meandering path of Baker Slough. Several seasonal waterways, such as Hunters Creek and the North Fork Logan Creek, descend from the ridge toward these eastern irrigation and drainage features. The map also records several benchmark locations and vertical angle benchmarks like Windgage 779, providing a technical look at the surveying points used to measure this transitional terrain during the mid-twentieth century.