[dd, decimal degrees; ft, feet above the North American Vertical Datum of 1988; OB, bulk deposition from E or VWM; E, depth-integrated depth-integrated environmental;																									
VWM, volume-weighted mean of two snowpack layers; ANC, acid neutralization capacity; ueq/L, microequivalents per liter;																									
uS/cm, microsiemens per centimeter; SC, specific conductance at 25degC; pH values in standard units; H, hydrogen; Ca, calcium;																									
Mg, magnesium; Na, sodium; K, potassium;  NH4, ammonium; Cl, chloride; SO4, sulfate; NO3, nitrate; DOC, dissolved organic carbon;																									
mg/L, milligrams per liter; SWE, snow-water equivalent;  cm, centimeters; d34S, stable-sulfur isotope ratio (34S/32S); Hg, mercury;																									
ng/L, nanograms per liter; NA or empty cell indicates not analyzed; <, below reporting limits; M, presence verified but not quantified; %, percent																									
missing year indicates no sample collected or sample results reviewed and rejected																									
Roth 1994: Mercury in water by CVAFD with potassium dichromate preservation																									
USEPA Method 1631, Rev E: Mercury in water by Oxidation, Purge and Trap, and CVAFS]																									
																									
Station ID	405100106580000																								
Site Name	ELK RIVER, CO																								
Latitude (dd)	40.8480722																								
Longitude (dd)	-106.9702111																								
Elevation (ft)	8639																								
SiteNumber	StationName	SampleDate	WaterYear	SampleType	ANC (ueq/L)	SC (uS/cm)	pH	H (ueq/L)	Ca (ueq/L)	Mg (ueq/L)	Na (ueq/L)	K (ueq/L)	NH4 (ueq/L)	Cl (ueq/L)	SO4 (ueq/L)	NO3 (ueq/L)	DOC (mg/L)	Total N (mg/L)	Total Dissolved N (mg/L)	Hg (ng/L) Roth 1994	Hg (ng/L) USEPA 1631	d34S (per mil)	SWE (cm)	Snow Depth (cm)	Ionic Balance (%)
405100106580000	ELK RIVER, CO	1993-04-07	1993	OB		7	4.9	12.6	<0.5	<0.2	0.9	<0.5	2.5	<1.1	6.9	12	<0.4					5.4	48	122	-8.3
405100106580000	ELK RIVER, CO	1994-03-19	1994	OB	-8	7	5.1	7.9	10	1.6	1.3	0.8	6.2	1.4	10.6	14	0.7					6.8	40	122	3.3
405100106580000	ELK RIVER, CO	1995-03-13	1995	OB	-12	7	5	10	10	<0.2	<0.9	<0.5	5.5	1.4	9.8	13.9	0.7					7	45	130	0.8
405100106580000	ELK RIVER, CO	1996-03-15	1996	OB	-6	5	5.1	7.9	7.5	<1.7	1.7	0.8	1.8	1.1	6.5	14.3	0.6					8.4		155	-5.3
405100106580000	ELK RIVER, CO	1997-03-29	1997	OB	-12	6	5	10	7.1	<1.7		1	2.5	1.4	7.5	10.7	1.2					6.1		145	2.5
405100106580000	ELK RIVER, CO	1998-03-12	1998	OB	-21	8	4.7	20	7.5	<1.7		0.5	4	1.1	11	16.6	0.6					5.3		137	5.4
405100106580000	ELK RIVER, CO	1999-03-11	1999	OB	-7.4	6	5.1	7.9	11	<1.7	3	0.8	4.8	1.7	7.3	13.9	0.3					7		119	9.1
405100106580000	ELK RIVER, CO	2000-03-19	2000	OB	-5.4	5	5.1	7.9	7.5	<1.7	1.7	0.5	3.9	<1.1	6.9	11.4	0.6							145	8
405100106580000	ELK RIVER, CO	2001-03-15	2001	OB	-11	8	5	10	11.5	<1.7	3.9	1	5.2	1.1	10.4	17.8	0.6							137	3.8
405100106580000	ELK RIVER, CO	2002-03-12	2002	OB	-7.4	6	5.3	5	12.5	2.5	6.5	0.5	5.7	2.3	9.8	16.4	0.4			1.5			31	122	6.9
405100106580000	ELK RIVER, CO	2003-03-24	2003	OB	-6.6	6	5.3	5	12.9	3.3	3	2	7	1.1	7.5	13.6	1.1			3.1			40	135	19.9
405100106580000	ELK RIVER, CO	2004-03-25	2004	OB	-9	6	5.2	6.3	11	2	<0.9	1	4.4	<1.1	7.5	14.3	0.5			1.7			43	117	6.2
405100106580000	ELK RIVER, CO	2005-03-24	2005	OB	-3.8	5	5.6	2.5	12.5	<1.7	2.6	1.3	4.4	<1.1	7.3	10	0.5			2.3		5.4	40	137	14.8
405100106580000	ELK RIVER, CO	2006-03-17	2006	OB	1	5	5.7	2	13.5	1.6	2.6	0.8	4.2	1.4	6.5	14.3	0.46						42	137	7.3
405100106580000	ELK RIVER, CO	2007-03-16	2007	OB	7.6	5.7	5.9	1.3	27.4	3.3	1.7	4.6	3	1.7	7.3	14.3	0.77						35	117	35.5
405100106580000	ELK RIVER, CO	2008-03-21	2008	OB	-1.4	5.7	5.3	5	12.5	1.6	<0.9	0.8	4.5	0.8	4	11.4	0.41						51	157	20.2
405100106580000	ELK RIVER, CO	2009-03-13	2009	OB	10	4.9	6.1	0.8	16.5	2.5	3	3.1	4.8	1.4	6.9	10	1.26	0.26			4.21		39	132	38
405100106580000	ELK RIVER, CO	2010-03-19	2010	OB	-9.2	5.6	5.1	7.9	7	1.6	0.9	0.5	6	0.8	5.6	12.1	0.42				1.36		36	122	12.7
405100106580000	ELK RIVER, CO	2011-03-18	2011	OB	-3.6	3.9	5.5	3.2	16.5	1.6	1.7	0.8	5	0.8	5.2	9.3	0.48				2.97		53	178	30.6
405100106580000	ELK RIVER, CO	2012-03-16	2012	OB	6	5	5.5	3.2	23	3.3	4.8	3.6	5.2	3.4	7.1	9.6	0.8	0.25			3.82		33	112	41.9
405100106580000	ELK RIVER, CO	2013-03-15	2013	OB	4	4	5.5	3.2	16	2.5	1.3	1.5	8.6	1.7	6.2	12.9	0.4	0.27			2.6		30	109	28.2
405100106580000	ELK RIVER, CO	2014-03-14	2014	OB	5.4	4	6	1	13	1.6	1.7	1	5.8	1.4	4.8	8.6	0.43	0.19	0.21				45	150	33.2
405100106580000	ELK RIVER, CO	2015-03-23	2015	OB	-1.8	4.3	5.4	4	10	2.5	1.7	2.6	3.7	1.4	4.8	8.6	0.78	0.18			5.31		36	119	24.7
405100106580000	ELK RIVER, CO	2016-03-17	2016	OB	6.6	3.6	6	1	14.5	1.6	2.6	1.5	4.4	1.1	4.6	7.9	0.45	0.31			2.63		33	132	40.6