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1962 Map of Blalock Island, 1972 Print
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1962 Map of Blalock Island

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.

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Map Details

Date Portrayed1962
Date Published1972
PublisherU.S. Geological Survey
Map TypeTopographic
Scale1:24,000
Physical Dimensions22 x 26.9 inches

Editions of this 1962 Blalock Island Map

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Source Details

SourceU.S. Geological Survey
CopyrightPublic Domain