The Spokane Valley-Rathdrum Prairie aquifer is the sole source of drinking water for residents in a rapidly growing area in Spokane County, Washington, and Bonner and Kootenai Counties, Idaho. In 2004, the U.S. Geological Survey, Washington State Department of Ecology, and Idaho Department of Water Resources developed a comprehensive study of the ground- and surface-water resources in the Spokane Valley-Rathdrum Prairie area. As a part of the study, the U.S. Geological Survey used water levels measured in 268 wells in September 2004 to construct a map of ground-water levels in the aquifer. Water-level data indicate that in late summer ground water flows generally southward from Hoodoo Valley to Coeur d'Alene and then westward toward Spokane. Water-table gradients ranged from 96 to 8 feet per mile.
Description of Study Area
Ground-Water Levels in the Spokane Valley-Rathdum Prairie Aquifer, September 2004
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Campbell, A.M., 2005, Ground-water levels in the Spokane Valley - Rathdrum Prairie Aquifer, Spokane County, Washington, and Bonner and Kootenai Counties, Idaho, September 2004: U.S. Geological Survey Scientific Investigations Map 2905.
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