Scientific Investigations Report 2006-5188
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006-5188
Table 7. Estimated long-term mean annual trace-metal loads and flow-weighted concentrations of cadmium, lead, and zinc at four streamflow-gaging stations in the Spokane River basin, Idaho.
[Long-term records are for the periods: Enaville (1992-2004), Pinehurst, Harrison (1991-2004), and Post Falls (1991-2003). Abbreviations: m3/s, cubic meter per second; µg/L, microgram per liter. –, no estimate]
| Water year | Mean streamflow (m3/s) | Mean annual trace-metal loads (kg) | Mean annual flow-weighted concentrations (µg/L) | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cadmium | Lead | Zinc | Cadmium | Lead | Zinc | |||||||||||||
| Dissolved (DCd) | Total (TCd) | Dissolved (DPb) | Total (TPb) | Dissolved (DZn) | Total (TZn) | Dissolved (DCd) | Total (TCd) | Dissolved (DPb) | Total (TPb) | Dissolved (DZn) | Total (TZn) | |||||||
| Pinehurst | ||||||||||||||||||
| 1991 | 20 | 4,200 | 5,800 | 4,200 | 94,000 | 640,000 | 790,000 | 6.4 | 8.9 | 6.5 | 150 | 990 | 1,200 | |||||
| 1992 | 9 | 2,600 | 2,900 | 2,000 | 9,900 | 400,000 | 440,000 | 9.2 | 10 | 7.1 | 35 | 1,500 | 1,600 | |||||
| 1993 | 12 | 2,700 | 3,100 | 2,700 | 32,000 | 430,000 | 470,000 | 7.0 | 8.2 | 7.0 | 83 | 1,100 | 1,200 | |||||
| 1994 | 8 | 2,200 | 2,300 | 1,700 | 11,000 | 350,000 | 350,000 | 8.7 | 9.2 | 7.0 | 42 | 1,400 | 1,400 | |||||
| 1995 | 15 | 3,300 | 3,800 | 2,700 | 46,000 | 510,000 | 530,000 | 7.0 | 8.1 | 5.8 | 98 | 1,100 | 1,100 | |||||
| 1996 | 23 | 3,900 | 5,400 | 3,600 | 670,000 | 610,000 | 710,000 | 5.3 | 7.2 | 4.8 | 900 | 820 | 960 | |||||
| 1997 | 24 | 3,500 | 4,600 | 4,000 | 240,000 | 550,000 | 630,000 | 4.7 | 6.0 | 5.3 | 310 | 720 | 840 | |||||
| 1998 | 12 | 2,600 | 2,800 | 2,200 | 21,000 | 400,000 | 390,000 | 6.6 | 7.1 | 5.7 | 53 | 1,000 | 1,000 | |||||
| 1999 | 19 | 3,000 | 3,600 | 3,200 | 66,000 | 460,000 | 500,000 | 4.9 | 5.9 | 5.2 | 110 | 740 | 810 | |||||
| 2000 | 17 | 2,700 | 3,100 | 2,600 | 48,000 | 400,000 | 430,000 | 5.1 | 5.9 | 5.0 | 91 | 760 | 820 | |||||
| 2001 | 7 | 1,300 | 1,400 | 1,200 | 5,700 | 210,000 | 220,000 | 6.4 | 6.6 | 5.9 | 27 | 1,000 | 1,100 | |||||
| 2002 | 19 | 2,300 | 3,000 | 2,900 | 95,000 | 340,000 | 410,000 | 3.8 | 4.9 | 4.7 | 150 | 560 | 680 | |||||
| 2003 | 11 | 1,700 | 2,000 | 1,700 | 16,000 | 250,000 | 290,000 | 4.9 | 5.7 | 4.7 | 44 | 700 | 810 | |||||
| 2004 | 11 | 1,600 | 1,900 | 1,700 | 6,600 | 220,000 | 270,000 | 4.5 | 5.4 | 4.7 | 19 | 640 | 760 | |||||
| Enaville | ||||||||||||||||||
| 1991 | – | – | – | – | – | – | – | – | – | – | – | – | – | |||||
| 1992 | 29 | 1,500 | 740 | 1,500 | 2,000 | 19,000 | 18,000 | 1.6 | 0.80 | 1.6 | 2.2 | 21 | 20 | |||||
| 1993 | 43 | 1,200 | 770 | 1,600 | 6,100 | 24,000 | 31,000 | .86 | .56 | 1.2 | 4.5 | 17 | 23 | |||||
| 1994 | 26 | 390 | 230 | 470 | 1,600 | 10,211 | 14,000 | .46 | .28 | .56 | 1.9 | 12 | 16 | |||||
| 1995 | 57 | 460 | 450 | 740 | 13,000 | 19,000 | 36,000 | .26 | .25 | .41 | 7.4 | 10 | 20 | |||||
| 1996 | 84 | 410 | 630 | 830 | 73,000 | 24,000 | 61,000 | .16 | .23 | .31 | 27 | 8.8 | 23 | |||||
| 1997 | 78 | 260 | 340 | 600 | 20,000 | 19,000 | 48,000 | .11 | .14 | .25 | 8.0 | 7.8 | 20 | |||||
| 1998 | 42 | 91 | 78 | 170 | 1,500 | 8,400 | 14,000 | .07 | .06 | .13 | 1.2 | 6.3 | 11 | |||||
| 1999 | 64 | 100 | 110 | 250 | 3,700 | 12,000 | 24,000 | .05 | .06 | .12 | 1.8 | 6.2 | 12 | |||||
| 2000 | 57 | 71 | 86 | 200 | 4,300 | 10,000 | 20,000 | .04 | .05 | .11 | 2.4 | 5.6 | 11 | |||||
| 2001 | 22 | 23 | 20 | 65 | 400 | 3,500 | 4,800 | .03 | .03 | .10 | .58 | 5.1 | 7.0 | |||||
| 2002 | 70 | 64 | 94 | 300 | 6,300 | 13,000 | 22,000 | .03 | .04 | .13 | 2.8 | 5.8 | 9.9 | |||||
| 2003 | 39 | 31 | 37 | 140 | 1,200 | 6,800 | 8,500 | .02 | .03 | .11 | .95 | 5.4 | 6.8 | |||||
| 2004 | 41 | 32 | 33 | 170 | 500 | 7,900 | 7,000 | .02 | .03 | .13 | .38 | 6.1 | 5.3 | |||||
| Harrison | ||||||||||||||||||
| 1991 | 96 | 7,300 | 10,000 | 26,000 | 730,000 | 1,400,000 | 1,100,000 | 2.4 | 3.4 | 8.5 | 240 | 460 | 380 | |||||
| 1992 | 42 | 3,700 | 4,200 | 8,900 | 71,000 | 750,000 | 510,000 | 1.2 | 1.4 | 2.9 | 23 | 250 | 170 | |||||
| 1993 | 64 | 4,000 | 5,000 | 16,000 | 220,000 | 760,000 | 620,000 | 1.3 | 1.6 | 5.4 | 73 | 250 | 210 | |||||
| 1994 | 38 | 2,700 | 3,000 | 8,300 | 67,000 | 540,000 | 400,000 | .89 | 1.0 | 2.7 | 22 | 180 | 130 | |||||
| 1995 | 75 | 4,300 | 6,000 | 19,000 | 330,000 | 810,000 | 770,000 | 1.4 | 2.0 | 6.3 | 110 | 270 | 260 | |||||
| 1996 | 120 | 5,500 | 10,000 | 35,000 | 2,600,000 | 1,000,000 | 1,300,000 | 1.8 | 3.3 | 12 | 850 | 330 | 430 | |||||
| 1997 | 100 | 4,200 | 6,800 | 31,000 | 690,000 | 770,000 | 940,000 | 1.4 | 2.2 | 10 | 230 | 250 | 310 | |||||
| 1998 | 57 | 2,900 | 3,600 | 13,000 | 99,000 | 520,000 | 530,000 | .94 | 1.2 | 4.3 | 33 | 170 | 180 | |||||
| 1999 | 86 | 3,400 | 5,000 | 23,000 | 240,000 | 600,000 | 740,000 | 1.1 | 1.6 | 7.4 | 80 | 200 | 250 | |||||
| 2000 | 77 | 2,900 | 4,300 | 20,000 | 260,000 | 510,000 | 660,000 | .95 | 1.4 | 6.6 | 86 | 170 | 220 | |||||
| 2001 | 30 | 1,200 | 1,400 | 6,300 | 36,000 | 210,000 | 240,000 | .38 | .47 | 2.1 | 12 | 71 | 80 | |||||
| 2002 | 93 | 2,600 | 4,300 | 26,000 | 410,000 | 440,000 | 700,000 | .85 | 1.4 | 8.7 | 140 | 150 | 230 | |||||
| 2003 | 52 | 1,600 | 2,400 | 12,000 | 110,000 | 290,000 | 410,000 | .53 | .79 | 4.1 | 37 | 95 | 140 | |||||
| 2004 | 54 | 1,600 | 2,200 | 12,000 | 66,000 | 280,000 | 410,000 | .53 | .73 | 4.1 | 22 | 91 | 130 | |||||
| Post Falls | ||||||||||||||||||
| 1991 | 230 | 7,700 | 6,100 | 27,000 | 57,000 | 720,000 | 690,000 | 1.1 | 0.85 | 3.7 | 7.9 | 100 | 96 | |||||
| 1992 | 98 | 2,900 | 2,600 | 7,000 | 17,000 | 320,000 | 320,000 | .94 | .83 | 2.3 | 5.5 | 100 | 100 | |||||
| 1993 | 150 | 3,800 | 3,400 | 6,000 | 22,000 | 420,000 | 420,000 | .79 | .70 | 1.3 | 4.7 | 89 | 87 | |||||
| 1994 | 84 | 1,800 | 1,700 | 2,200 | 9,000 | 240,000 | 240,000 | .68 | .65 | .82 | 3.4 | 89 | 92 | |||||
| 1995 | 180 | 3,300 | 3,200 | 2,700 | 14,000 | 500,000 | 510,000 | .58 | .57 | .48 | 2.5 | 90 | 90 | |||||
| 1996 | 290 | 4,300 | 4,200 | 2,700 | 18,000 | 740,000 | 740,000 | .47 | .46 | .30 | 2.0 | 81 | 81 | |||||
| 1997 | 290 | 3,700 | 3,900 | 2,500 | 20,000 | 670,000 | 670,000 | .41 | .42 | .27 | 2.1 | 73 | 73 | |||||
| 1998 | 140 | 1,600 | 1,800 | 1,200 | 8,200 | 320,000 | 340,000 | .35 | .39 | .27 | 1.8 | 71 | 75 | |||||
| 1999 | 210 | 2,000 | 2,300 | 1,700 | 12,000 | 450,000 | 470,000 | .29 | .34 | .25 | 1.8 | 66 | 70 | |||||
| 2000 | 190 | 1,600 | 1,900 | 1,700 | 11,000 | 400,000 | 430,000 | .25 | .31 | .27 | 1.7 | 65 | 69 | |||||
| 2001 | 76 | 510 | 660 | 870 | 4,600 | 140,000 | 160,000 | .21 | .27 | .36 | 1.9 | 57 | 64 | |||||
| 2002 | 220 | 1,300 | 1,600 | 2,800 | 14,000 | 390,000 | 420,000 | .18 | .23 | .40 | 2.0 | 56 | 60 | |||||
| 2003 | 130 | 660 | 940 | 2,300 | 8,300 | 250,000 | 280,000 | .16 | .22 | .55 | 2.0 | 59 | 66 | |||||
| 2004 | – | – | – | – | – | – | – | – | – | – | – | – | – | |||||
U.S.
Department of the Interior | U.S. Geological
Survey
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