Trinity, Humboldt, and Del Norte counties (NRCS 2006) (Figure 1-1). Annual precipitation in the upper basin, that is, above Iron Gate Dam, averages from 68 to 69 cm (about 27 in.) (Risley and Laenen 1999) but is only about 30.5 cm (12 in.) at Klamath Falls (from Weather Underground 2007). In the lower basin, annual precipitation can exceed 255 cm (100

FIGURE 1-1 Map of the upper Klamath River basin showing surface waters and landmarks mentioned in this report.

SOURCES: Reproduced from NRC 2004a, modified from U.S. Fish and Wildlife Service.

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