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1962 Map of Blalock Island

Name: 1962 Topographic Map of Blalock Island
Creator: U.S. Geological Survey
Published: 1972
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1972

About this map

Blalock Island dominates the center of the Columbia River in this survey, which captures the complex waterway during the period of its transformation into Lake Umatilla. The map illustrates the state boundary between Washington and Oregon as it follows the river’s North Channel and South Channel, effectively bisecting the island and the river itself.

The landscape is defined by the steep rises of Paterson Ridge and Canoe Ridge, where the high desert plateau meets the river valley. Infrastructure of the early 1970s is evident in the Burlington Northern Railroad tracks skirting the northern shore and a prominent Pipeline cutting across the ridgelines. Smaller drainages like Glade Creek and its East Branch carve deep paths through the terrain, while the presence of a Gravel Pit indicates local industry tailored to the river's resources.