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Upper Umatilla River Basin, Oregon zoned study area

Published by U.S. Geological Survey | Department of the Interior | Metadata Last Checked: January 27, 2026 | Last Modified: 2020-08-27T00:00:00Z
This polygon shapefile is the delineation of the upper Umatilla River study area boundary. It is split into two regions, the Blue Mountains and the Lowland Plains, as described in the processing steps. These data were used to analyze precipitation and recharge in the study area as a whole and in the two regions.

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