Scientific Investigations Report 2006-5188

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006-5188

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Table 5. Estimated mean annual flow-weighted concentrations of trace metals for 10 streamflow-gaging stations in the Spokane River basin, Idaho and Washington, water years 1999–2004.

[Gaging station locations are shown in figures 1 and 2. All values are in micrograms per liter unless otherwise noted. Abbreviations: FWC, flow-weighted concentration; m3/s, cubic meter per second. Symbols: –, no estimate]

Water year Gaging station number and name
1
Canyon
Creek		 2
Ninemile
Creek		 3
Elizabeth
Park		 4
Amy
Gulch		 5
Pinehurst		 6
Enaville		 7
Harrison		 8
Outlet		 9
Post
Falls		 10
Long
Lake
Mean annual streamflow (m3/s)
1999 1.7 0.5 12 5.6 19 64 86 – 210 260
2000 1.5 .5 10 4.6 17 57 77 – 190 240
2001 .9 .2 4.3 1.6 7 22 30 – 76 110
2002 1.7 .7 12 5.7 19 70 93 – 220 250
2003 1.2 .3 7.2 3.3 11 39 52 130 130 160
2004 – – 7.2 – 11 41 54 130 – –
Mean 1.4 0.5 8.8 4.1 14 49 65 130 165 200
Dissolved cadmium (DCd) FWC
1999 12 14 4.2 0.31 4.8 0.03 1.2 – 0.21 0.13
2000 13 14 3.9 .32 5.0 .03 1.2 – .21 .11
2001 12 15 5.0 .33 6.4 .03 1.2 – .19 –
2002 9.1 9.8 2.9 .30 3.7 .03 .87 – .21 .08
2003 11 12 3.8 .33 4.9 .03 .97 0.23 .21 .07
2004 – – 4.1 – 4.6 .03 .92 .20 – –
Mean 11 13 4.0 0.32 4.9 0.03 1.1 0.21 0.21 0.10
Total cadmium (TCd) FWC
1999 12 15 4.9 0.17 5.5 0.04 1.9 – 0.31 0.12
2000 13 15 4.5 .28 5.8 .04 1.8 – .30 .12
2001 13 15 5.1 .36 6.6 .03 1.4 – .25 –
2002 9.6 11 3.3 .39 5.2 .05 1.6 – .27 .10
2003 11 13 4.1 .34 6.3 .03 1.5 0.27 .25 .10
2004 – – 4.3 – 6.2 .03 1.2 .23 – –
Mean 12 14 4.4 0.31 5.9 0.04 1.6 0.25 0.28 0.11
Dissolved lead (DPb) FWC
1999 25 28 3.4 0.56 4.4 0.07 8.4 – 0.25 0.53
2000 22 26 3.2 .52 4.1 .08 8.4 – .35 .46
2001 19 24 4.0 .41 5.0 .09 6.7 – .29 –
2002 15 18 2.5 .65 3.3 .12 9.0 – .74 .35
2003 13 20 2.7 .53 3.3 .12 7.7 0.33 .61 .15
2004 – – 2.6 – 3.1 .14 7.4 .23 – –
Mean 19 23 3.1 0.53 3.9 0.10 7.9 0.28 0.45 0.37
Total lead (TPb) FWC
1999 190 150 61 5.2 100 1.6 91 – 2.9 1.3
2000 110 130 48 7.0 87 2.6 130 – 2.9 1.4
2001 67 55 18 1.3 25 .65 39 – 1.8 –
2002 110 230 84 30 160 4.5 200 – 3.9 1.7
2003 38 51 26 9.8 48 1.7 100 1.5 1.8 .8
2004 – – 23 – 20 .77 48 1.5 – –
Mean 100 120 43 11 73 2.0 100 1.5 2.7 1.3
Dissolved zinc (DZn)
1999 1,600 2,400 660 89 700 6.4 210 – 69 34
2000 2,000 2,300 620 94 720 6.2 200 – 68 33
2001 1,900 2,300 760 96 980 5.6 230 – 55 –
2002 1,400 1,600 400 85 550 6.2 150 – 58 27
2003 1,500 1,900 600 100 710 6.1 180 61 58 26
2004 – – 630 – 680 6.2 170 57 – –
Mean 1,700 2,100 610 93 720 6.1 190 59 62 30
Total zinc (TZn)
1999 1,500 2,400 700 100 800 11 280 – 71 40
2000 1,700 2,400 650 110 820 11 270 – 71 46
2001 1,700 2,200 740 100 1,000 7.8 230 – 60 –
2002 1,400 1,800 490 100 670 13 230 – 67 38
2003 1,800 2,000 610 110 810 10 230 68 67 29
2004 – – 640 – 750 9.0 200 57 – –
Mean 1,600 2,200 640 100 810 10 240 63 67 38

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