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Scientific Investigations Report 2008–5168

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2008–5168

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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.

[Sampling locations are shown in figure 1. Sampling locations on the St. Joe and Spokane Rivers changed between the 1991–92 and 2004–06 studies. Few differences in trace-metal inputs are expected between sampling locations. Locations sampled in 1991–92 study: St. Joe River, USGS gaging station 12415075, St. Joe River at St. Maries; Spokane River, USGS gaging station 12419000, Spokane River near Post Falls. Locations sampled in 2004–06 study: St. Joe, USGS gaging station 12415140, St. Joe River near Chatcolet; Spokane River, USGS gaging station 12417598, Spokane River at Lake Outlet at Coeur d’Alene. Sampling location on the Coeur d’Alene River for both studies was at USGS gaging station 12413860, Coeur d’Alene River near Harrison. Loads and errors are in kilograms per year. Streamflows are in cubic hectometers per year. Abbreviations: ND, analyte concentration frequently less than method reporting limit; unable to calculate loads using LOADEST; USGS, U.S. Geological Survey ; NA, not applicable]

Variable Budget component Calendar year   Water year
1991 1992 2004 2005 2006
Load Error Load Error   Load Error Load Error Load Error
Total cadmium
Gaged inflow St. Joe River ND NA ND NA ND NA ND NA ND NA
Coeur d’Alene River 8,930 1,070 4,170 460 2,300 270 3,090 420 3,300 440
Gaged outflow Spokane River 5,720 680 2,560 290 1,000 60 930 50 1,270 90
Total lead
Gaged inflow St. Joe River 34,400 9,300 5,860 1,300 380 70 530 130 740 160
Coeur d’Alene River 488,000 111,000 74,400 11,000 85,400 13,600 111,000 22,100 178,000 32,800
Gaged outflow Spokane River 68,200 9,300 13,400 1,510 5,540 640 5,050 570 6,520 1,160
Total zinc
Gaged inflow St. Joe River 59,900 18,000 39,300 11,000 2,870 500 3,830 760 5,190 840
Coeur d’Alene River 935,000 127,000 444,000 52,200 367,000 46,000 482,000 69,200 552,000 77,400
Gaged outflow Spokane River 648,000 50,800 324,000 23,100 240,000 7,630 235,000 8,060 309,000 12,900
Summary
Constituent load Calendar year   Water year
1991 1992 2004 2005 2006
Total cadmium
Total inflow 8,930 4,170 2,300 3,090 3,300
Total outflow 5,720 2,560 1,000 930 1,270
Residual (outflow-inflow) -3,210 -1,610 -1,300 -2,160 -2,030
Residual (percentage of inflow) 36 39 56 70 62
Overall error 1,270 540 280 420 450
Total lead
Total inflow 522,000 80,300 85,800 112,000 179,000
Total outflow 68,200 13,400 5,540 5,050 6,520
Residual (outflow-inflow) -454,000 -66,900 -80,300 -107,000 -172,000
Residual (percentage of inflow) 87 83 94 95 96
Overall error 112,000 11,200 13,600 22,100 32,800
Total zinc
Total inflow 995,000 483,000 370,000 486,000 557,000
Total outflow 648,000 324,000 240,000 235,000 309,000
Residual (outflow-inflow) -347,000 -159,000 -130,000 -251,000 -248,000
Residual (percentage of inflow) 35 33 35 52 44
Overall error 138,000 58,100 46,600 69,700 78,500

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