Scientific Investigations Report 2007–5117
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5117
Figure 8. Frequency distributions of lakewide chlorophyll‑a data, by month, Upper Klamath and Agency Lakes, Oregon, June–September 1990–2006. Years are displayed in order of increasing lake level based on end-of-month lake-level rankings for the preceding month (see table 2).