Western Streams and Rivers Statistical Summary
Stoddard, J.L., D.V. Peck, A.R. Olsen, D.P. Larsen, J. Van Sickle, C.P. Hawkins,
R.M. Hughes, T.R. Whittier, G. Lomnicky, A.T. Herlihy, P.R. Kaufmann, S.A.
Peterson, P.L. Ringold, S.G. Paulsen, R. Blair.
2005. U.S. Environmental Protection Agency, Office of Research and Development, Washington, DC. EPA 620/R-05/006
This statistical summary reports data from the Environmental Monitoring and Assessment Program (EMAP) Western Pilot (EMAP-W). EMAP-W was a sample survey (or probability survey, often simply called ‘random’) of streams and rivers in 12 states of the western U.S. (Arizona, California, Colorado, Idaho, Montana, Nevada, North Dakota, Oregon, South Dakota, Utah, Washington and Wyoming), comprising the conterminous portions of EPA Regions 8, 9 and 10. The eventual objective of EMAP-W is to assess the ecological condition of, and relative importance of, stressors in streams and rivers of the West at multiple scales. This Statistical Summary is the first step in making that assessment, in that it reports on the validated and verified, but largely uninterpreted, data collected by EMAP-W.