Numerous agencies and individuals provided information and assistance with data collection and data processing as part of this study. The authors acknowledge the following agencies for their cooperation: Idaho Agricultural Statistics Service; Idaho State Department of Agriculture; Idaho Division of Environmental Quality (formerly Idaho Department of Health and Welfare, Division of Environmental Quality); Idaho Department of Water Resources; Idaho Department of Fish and Game; University of Idaho, Cooperative Extension Service; University of Idaho, Agricultural Research Service; U.S. Natural Resource Conservation Service; U.S. Environmental Protection Agency; U.S. Fish and Wildlife Service; and Wyoming Game and Fish Department. Individuals from the U.S. Geological Survey who provided field assistance include Jay Bateman, Michael Beckwith, Craig Bowers, Stephanie Eisenbarth, Jeff Foster, Steve Goodbred, Kirk Miller, Bill Mullins, Terry Short, Marc Sylvester, Ian Waite, and Cathy Wolf. Special thanks go to Ken Skinner of the U.S. Geological Survey for providing valuable assistance during all phases of the study; and Alan Haggland, Sarah Ryker, and Jon Scott of the U.S. Geological Survey for production of the Compound Detections and Concentrations table.
Photograph on front cover: Taggart Creek on the east side of the Teton Range, Grand Teton National Park, Wyoming (photograph by M.G. Rupert, U.S. Geological Survey).
Photographs on back cover: 1. Sprinkler irrigation of crops near Pocatello, Idaho (photograph © 1980 by W.H. Mullins and published with permission). 2. Fall harvest of barley in the Teton River Valley, Idaho (photograph © 1995 by W.H. Mullins and published with permission).