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News Release

U.S. Department of the Interior
U.S. Geological Survey

Release: May 27, 2008
Marijke van Heeswijk

John Clemens

Hatchery Water Temps Rise Tied To Columbia River

[Editors: The report can be viewed on the Web at .]

A reported increase in temperatures of groundwater supplying a salmon hatchery in Douglas County is likely due to an increase in Columbia River temperatures, according to a report published today by the U.S. Geological Survey (USGS), prepared in cooperation with Public Utility District No. 1 of Chelan County (PUD). The temperature increases measured from 1999 through 2006 are within the range of natural variability.

Groundwater from the Eastbank Aquifer system supplies the Eastbank Hatchery with a steady supply of fresh, cool water to raise salmon. The aquifer system also supplies water to more than 65,000 residents in the cities of Wenatchee, East Wenatchee, and parts of unincorporated Chelan and Douglas Counties.

To understand how the Eastbank Aquifer system works, USGS scientists inventoried all available wells in the study area, measured water levels and temperatures, took water samples for chemical analyses, and analyzed more than 16 years of water-level and temperature data collected by the PUD.

The report, "Conceptual Model of Hydrologic and Thermal Conditions of the Eastbank Aquifer System near Rocky Reach Dam, Douglas County, Washington," by Marijke van Heeswijk, Stephen E. Cox, Raegan L. Huffman, and Christopher A. Curran, is published as U.S. Geological Survey Scientific Investigations Report 2008-5071 and is available on the Web at .

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