Scientific Investigations Report 2006–5209
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5209
Table 14. Distribution statistics of water column averages of chlorophyll a, ammonia-N, dissolved oxygen, and temperature at Eagle Ridge site, based on July–August sampling dates, Upper Klamath Lake, Oregon, 1990–2004.
[Water-quality data are biweekly values of chlorophyll a and nutrients, and biweekly profiles of dissolved oxygen collected by the Klamath Tribes at Eagle Ridge in Upper Klamath Lake during July and August 1990–2004. Quartile: Q1, first quartile; Q2, second quartile; Q3, third quartile; Q4, fourth quartile. Abbreviations: mg/L, milligram per liter; ºC, degree Celsius; µg/L, microgram per liter]
| Water column averaged value | ||||
|---|---|---|---|---|
| Dissolved oxygen (mg/L) |
Temperature (°C) |
Chlorophyll a (µg/L) |
Ammonia-N (µg/L) |
|
| Percentile | ||||
| 95th | 8.03 | 23.4 | 314 | 1,170 |
| 90th | 7.51 | 22.9 | 256 | 1,090 |
| 75th | 6.54 | 21.8 | 148 | 898 |
| 50th | 4.72 | 20.4 | 100 | 313 |
| 25th | 3.72 | 19 | 60 | 86 |
| 10th | 2.16 | 17.9 | 24 | 29 |
| 5th | 1.21 | 17.3 | 14 | 19 |
| Values on dates closest to fish die-offs | ||||
| 07-28-03 | 0.6 | 24.3 | 28 | 907 |
| Quartile | Q1 | Q4 | Q1 | Q4 |
| 08-20-96 | 5.16 | 19.7 | 64 | 979 |
| Quartile | Q3 | Q2 | Q2 | Q4 |
| 08-12-97 | 4.3 | 21.1 | 44 | 803 |
| Quartile | Q2 | Q3 | Q1 | Q3 |
U.S.
Department of the Interior | U.S. Geological
Survey
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