1. U.S. Geological Survey, Idaho Water Science Center, Boise, Idaho 83702, United States
2. U.S. Geological Survey, Forest and Rangeland Ecosystem Science Center, Corvallis, Oregon 97330, United States
3. Department of Environmental Toxicology, University of California at Davis, Davis, California 95616, United States
4. U.S. Geological Survey, Upper Midwest Water Science Center, Madison, Wisconsin 53726, United States
5. Idaho Power Company, Boise, Idaho 83702, United States