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1989 Map of Rail Canyon

Name: 1989 Topographic Map of Rail Canyon
Creator: U.S. Geological Survey
Published: 1989
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1989

About this map

Clark Valley defines the central axis of this northern California landscape, where the South Fork Clark Valley Creek follows a narrow corridor between steep ridgelines. The terrain is marked by prominent natural boundaries and elevations, notably Needham Ridge to the west and the height of High Peak overlooking the eastern canyons. Water is the primary architect of the area's geography, with seasonal drainages like Hubbard Valley Creek and Fillippi Creek carving into the hills.

A network of unimproved roads and trails suggests a history of ranching or backcountry access rather than dense settlement, crossing the county line between Glenn and Colusa Counties. Geologists and researchers can trace the course of Rail Ridge and Seminary Ridge as they flank the central valley, punctuated by isolated features such as Glen Spring. The eastern portion of the survey transitions into the broader drainages of Squaw Flat Creek and Minton Creek, highlighting the complex watershed patterns typical of the inner Coast Ranges.