Water Resources of Idaho

Trace elements in caddis fly tissue from select sites on the Spokane River, July 1999. Concentrations in micrograms per gram or parts per million (ppm) dry weight; <, value less than reporting limit.
	Post Falls	Otis Orchards	Greenacres	Trentwood	Green Street	7-Mile Bridge
river mile	100	96	90	85	77	63
USGS site ID	12419000	12419500	12420500	12420800	12422000	12424500
Ag	<0.5	<0.5	<0.5	<0.5	<0.5	<0.5
Cu	14	9	11	13	14	10
Pb	45	52	53	92	47	20
Zn	450	500	530	550	520	330
Cd	3.3	3.5	3.2	3.3	3.0	1.7
Cr	1	4	9	6	5	<1
Co	2	2	3	2	2	2
Ni	3	4	5	3	3	2
Ba	50	130	160	74	78	64
V	6	12	15	9	8	7
Li	2	7	8	3	3	3
Be	0.2	0.4	0.6	0.3	0.2	0.2
Mo	<5	<5	<5	<5	<5	<5
P	8,500	7,300	6,200	7,100	7,400	5,800
Sr	14	20	46	9	12	13
As	2.2	2.4	3.4	3.6	2.9	2.0
Sb	0.2	0.3	0.5	0.4	0.2	<0.1
Se	0.2	0.2	0.2	0.8	0.6	0.5
Hg	0.09	0.04	0.02	0.03	0.04	0.02
Fe	3,900	6,600	7,500	3,700	3,300	3,100
Mn	310	370	420	470	470	350
Al	0.5	1.4	1.8	0.9	0.7	0.5
Ti	0.02	0.06	0.07	0.04	0.04	0.03
Percent moisture	90	83	78	83	80	83

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