ARAPAHOE CREEK BASIN

THREE LAKES WATER-QUALITY STUDY-Continued

09016500 ARAPAHOE CREEK AT MONARCH LAKE OUTLET, CO

WATER-QUALITY RECORDS

LOCATION.--Lat 40°06'45", long 105°44'57", in SW14SW14 sec.24, T.2 N., R.75 W., Grand County, Hydrologic Unit 14010001, approximately 0.25 mi downstream from Monarch Lake Outlet and 10 mi east of Granby.

DRAINAGE AREA.--46.9 mi2.

PERIOD OF RECORD.--November 2000 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=09016500

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

Date	Time	Instan- taneous dis- charge, cfs (00061)	Dis- solved oxygen, mg/L (00300)	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)	Alka- linity, wat flt fxd end lab, mg/L as CaCO3 (29801)	Chlor- ide, water, fltrd, mg/L (00940)
OCT
22...	0905	12	7.0	40	4.5	17	4.91	1.14	0.35	0.1	1.16	--	<0.20
NOV
23...	1100	--	9.4	28	2.6	19	5.34	1.28	0.40	0.1	1.23	16	0.27
MAR
03...	1600	7.4	10.1	56	1.3	22	6.38	1.51	0.59	0.1	1.50	20	0.33
MAY
01...	1545	69	9.6	41	2.5	16	4.52	1.14	0.39	0.1	1.15	14	0.33
12...	1615	41	8.8	38	5.5	17	4.81	1.12	0.40	0.1	1.30	14	0.41
21...	1550	449	9.8	30	5.6	12	3.58	0.817	0.36	0.1	0.88	9	0.25
JUN
02...	1045	1,270	9.9	56	4.3	9	2.70	0.617	0.31	0.1	0.70	7	0.17
18...	1600	729	10.3	23	8.3	10	2.85	0.634	0.24	0.1	0.67	8	0.16
JUL
08...	1515	203	7.9	26	14.3	11	3.26	0.689	0.226	0.1	0.73	9	0.14
AUG
14...	1430	46	7.2	34	19.8	14	4.09	0.926	0.189	0.1	0.87	13	0.08
SEP
16...	0900	68	8.9	34	9.0	13	3.76	0.861	0.236	0.1	0.75	11	0.12

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

Date	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)	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)	Ortho- phos- phate, water, fltrd, mg/L as P (00671)	Phos- phorus, water, unfltrd mg/L (00665)	Organic carbon, water, fltrd, mg/L (00681)
OCT
22...	--	4.86	--	--	--	--	0.005	0.065	0.002	--	--
NOV
23...	3.44	4.99	27	0.04	--	--	--	--	--	--	1.0
MAR
03...	5.66	4.68	34	0.05	0.67	0.25	0.090	0.119	E.002	E.003	0.9
MAY
01...	5.25	3.65	25	0.03	4.68	0.22	0.023	0.083	<0.007	0.004	3.7
12...	4.97	3.76	26	0.03	2.86	0.18	0.016	0.059	<0.007	0.008	3.4
21...	4.58	2.65	19	0.03	23.2	0.18	<0.015	0.080	<0.007	0.008	4.3
JUN
02...	3.88	2.03	15	0.02	51.6	0.15	<0.015	0.114	<0.007	0.009	4.6
18...	3.43	2.02	15	0.02	29.6	E.09	<0.015	0.092	<0.007	0.006	2.5
JUL
08...	2.44	2.19	15	0.02	8.45	0.13	<0.015	0.033	<0.007	0.005	2.2
AUG
14...	1.59	2.78	18	0.02	2.23	0.16	E.008	<0.022	<0.007	0.008	1.9
SEP
16...	2.83	3.63	19	0.03	3.52	0.16	E.011	0.086	<0.007	0.005	2.3
< -- Actual value is known to be less than the value shown. E -- Estimated laboratory analysis value.