PLATTE RIVER BASIN

06758500 SOUTH PLATTE RIVER NEAR WELDONA, CO-Continued

WATER-QUALITY RECORDS

PERIOD OF RECORD.--October 1967 to September 1968, October 1971 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=06758500

WATER-QUALITY DATA, WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003

Date	Time	Instan- taneous dis- charge, cfs (00061)	Dis- solved oxygen, mg/L (00300)	pH, water, unfltrd field, std units (00400)	Specif. conduc- tance, wat unf uS/cm 25 degC (00095)	Temper- ature, water, deg C (00010)	Hard- ness, water, unfltrd mg/L as CaCO3 (00900)	Calcium water, fltrd, mg/L (00915)	Magnes- ium, water, fltrd, mg/L (00925)	Potas- sium, water, fltrd, mg/L (00935)	Sodium adsorp- tion ratio (00931)	Sodium, water, fltrd, mg/L (00930)	ANC, wat unf fixed end pt, lab, mg/L as CaCO3 (90410)
DEC
16...	1045	52	14.4	8.6	1,660	4.0	620	155	55.9	7.17	3	151	E248
APR
04...	1020	507	11.7	8.4	1,460	10.0	470	113	44.6	7.47	2	121	218
SEP
05...	0940	335	7.9	8.2	1,360	18.5	460	114	42.0	8.29	2	119	218

WATER-QUALITY DATA, WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003

Date	Chlor- ide, water, fltrd, mg/L (00940)	Fluor- ide, water, fltrd, mg/L (00950)	Silica, water, fltrd, mg/L (00955)	Sulfate water, fltrd, mg/L (00945)	Residue water, fltrd, sum of consti- tuents mg/L (70301)	Residue water, fltrd, tons/ acre-ft (70303)	Residue water, fltrd, tons/d (70302)	Residue on evap. at 180degC wat flt mg/L (70300)	Ammonia + org-N, water, unfltrd mg/L as N (00625)	Ammonia water, fltrd, mg/L as N (00608)	Nitrite + nitrate water fltrd, mg/L as N (00631)	Nitrite water, fltrd, mg/L as N (00613)	Ortho- phos- phate, water, fltrd, mg/L as P (00671)
DEC
16...	81.9	1.03	14.0	534	--	--	--	1,230	0.40	E.012	4.24	0.037	0.104
APR
04...	90.7	1.02	11.0	401	948	1.39	1,400	1,020	0.84	0.024	5.41	0.015	0.450
SEP
05...	75.3	1.0	13.1	378	901	1.32	875	967	0.86	E.014	3.79	0.015	0.293

WATER-QUALITY DATA, WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003

Date	Phos- phorus, water, fltrd, mg/L (00666)	Phos- phorus, water, unfltrd mg/L (00665)	E coli, m-TEC MF, water, col/ 100 mL (31633)	Barium, water, fltrd, ug/L (01005)	Beryll- ium, water, fltrd, ug/L (01010)	Boron, water, fltrd, ug/L (01020)	Cadmium water, fltrd, ug/L (01025)	Chrom- ium, water, fltrd, ug/L (01030)	Cobalt water, fltrd, ug/L (01035)	Copper, water, fltrd, ug/L (01040)	Iron, water, fltrd, ug/L (01046)	Lead, water, fltrd, ug/L (01049)	Lithium water, fltrd, ug/L (01130)
DEC
16...	0.113	0.137	E6	43.4	<0.5	293	<0.2	<0.8	0.975	3.0	<10	0.21	37.9
APR
04...	0.47	0.62	E8	36.3	<0.5	246	E.2	<0.8	1.01	3.8	<10	0.25	31.8
SEP
05...	0.33	0.41	>320	41.9	<0.4	242	<0.2	<0.8	0.889	5.6	--	0.28	31.9

WATER-QUALITY DATA, WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003

Date	Mangan- ese, water, fltrd, ug/L (01056)	Molyb- denum, water, fltrd, ug/L (01060)	Nickel, water, fltrd, ug/L (01065)	Selen- ium, water, fltrd, ug/L (01145)	Silver, water, fltrd, ug/L (01075)	Stront- ium, water, fltrd, ug/L (01080)	Vanad- ium, water, fltrd, ug/L (01085)	Zinc, water, fltrd, ug/L (01090)
DEC
16...	36.4	4.9	5.83	4	<0.2	1,610	1.6	5
APR
04...	14.5	7.6	3.56	3	<0.2	1,330	2.8	8
SEP
05...	40.1	8.4	3.85	3	<0.2	1,290	3.3	7
< -- Actual value is known to be less than the value shown. E - Estimated laboratory analysis value.