Scientific Investigations Report 2008–5168
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2008–5168
Coeur d’Alene Lake, Idaho: Insights Gained From Limnological Studies of 1991–92 and 2004–06
Prepared in cooperation with the Coeur d’Alene Tribe
By Molly S. Wood and Michael A. Beckwith
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Figures
Figure 1. Study area and locations of streamflow-gaging stations and littoral, benthic flux, and pelagic stations, in and near Coeur d’Alene Lake, Idaho, water years 1999 and 2004–06.
Figure 2. Variation in lake stage and sampling dates at pelagic stations, Coeur d’Alene Lake, Idaho, water years 2004–06.
Figure 3. Median depths of thermocline, Secchi-disc transparency, and euphotic zone at five pelagic stations, Coeur d’Alene Lake, Idaho, calendar years 1991–92 and water years 2004–06.
Figure 4. Minimum and maximum percent saturation of dissolved oxygen at five pelagic stations, Coeur d’Alene Lake, Idaho, calendar years 1991–92 and water years 2004–06.
Figure 5. Median concentrations of total phosphorus in the euphotic zone and hypolimnion at five pelagic stations, Coeur d’Alene Lake, Idaho, calendar years 1991–92 and water years 2004–06.
Figure 6. Median concentrations of dissolved inorganic nitrogen in the euphotic zone and hypolimnion at five pelagic stations, Coeur d’Alene Lake, Idaho, calendar years 1991–92 and water years 2004–06.
Figure 7. Median concentrations of chlorophyll-a in the euphotic zone at five pelagic stations, Coeur d’Alene Lake, Idaho, calendar years 1991–92 and water years 2004–06.
Figure 8. Median concentrations of total zinc in euphotic zone and hypolimnion at five pelagic stations, Coeur d’Alene Lake, Idaho, calendar years 1991–92 and water years 2004–06.
Tables
Table 1. Pelagic stations in Coeur d’Alene Lake, Idaho, common to studies in calendar years 1991–92 and water years 2004–06.
Table 2. Lake characteristics for selection of limnological sampling times at five pelagic stations in Coeur d’Alene Lake, Idaho, water years 2004–06.
Table 3. Littoral stations sampled in Coeur d’Alene Lake, Idaho, water years 2004–06.
Table 4. Nutrient load budgets and errors, Coeur d’Alene Lake, Idaho, calendar years 1991–92 and water years 2004–06.
Table 5. Selected trace-metal loads and errors measured at three gaging stations near Coeur d’Alene Lake, Idaho, calendar years 1991–92 and water years 2004–06.
Table 6. Changes in method reporting limits for selected constituents sampled in Coeur d’Alene Lake, Idaho, calendar years 1991–92 and water years 2004–06.
Table 7. Trophic state based on lake-wide median values for three limnological variables, Coeur d’Alene, Idaho, calendar years 1991–92 and water years 2004–06.
Table 8. Comparisons of medians and ranges of total phosphorus, chlorophyll-a, and total zinc concentrations at pelagic and paired littoral stations on common weeks sampled, Coeur d’Alene Lake, Idaho, water years 2004–05.
Table 9. Inflow plume routing based on comparison of riverine inflow temperatures and water column temperature ranges at pelagic station 3, Coeur d’Alene Lake, Idaho, water years 2004–05.
Table 10. Benthic flux of dissolved metals measured by an in-situ flux chamber, Coeur d’Alene Lake, Idaho, 1999.
Table 11. Benthic flux of nutrients and dissolved organic carbon measured by an in-situ flux chamber, Coeur d’Alene Lake, Idaho, 1999.
Table 12. Medians and ranges of concentrations of selected constituents measured in lower hypolimnion and near sediment-water interface at pelagic station 4, Coeur d’Alene Lake, Idaho, water years 2004-06.
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Send questions or comments about this report to the author, M.S. Wood, (208) 387-1320.
For more information about USGS activities in Idaho, visit the USGS Idaho Water Science Center home page.