Begun in 1934, this survey was conducted by the Fish and Wildlife Service to collect information for the development of a program for the maintenance and rehabilitation of the fisheries of the Columbia River. One of the major purposes of the survey was to study the condition of the various tributaries of the Columbia to determine their carrying capacity for migratory fishes. The study was divided up into seven geographic regions encompassing the extent of the Columbia River watershed in Oregon, Washington and Idaho. In 1948 the survey was concluded with the publication of the first of a series of seven reports summarizing the data collected for the study.
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