Scientific Investigations Report 2007–5041
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5041
Figure 3. Average annual precipitation based on 30 years of record, 1961–90, in the Spokane Valley-Rathdrum Prairie aquifer study area, Spokane County, Washington, and Bonner and Kootenai Counties, Idaho. (Data obtained from Oregon State University, 2005.)