GRAND LAKE OUTLET BASIN

THREE LAKES WATER-QUALITY STUDY-Continued

09012500 NORTH INLET AT GRAND LAKE, CO

WATER-QUALITY RECORDS

LOCATION.--Lat 40°15'12", long 105°48'39" (revised), in NE14 sec.5, T.3 N., R.75 W., Grand County, Hydrologic Unit 14010001, at north edge of town of Grand Lake, 600 ft downstream from Tonahutu Creek and 0.20 mi upstream from high-water line of Grand Lake.

DRAINAGE AREA.--45.9 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=09012500

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...	1150	4.3	10.4	21	1.5	7	2.25	0.437	0.22	0.2	1.44	--	0.52
NOV
22...	1300	3.9	10.7	24	0.1	7	2.14	0.450	0.20	0.2	1.43	7	0.18
MAR
03...	1145	6.0	11.4	26	0.1	8	2.49	0.523	0.29	0.3	1.67	9	0.17
MAY
01...	1200	51	10.3	29	2.5	10	3.00	0.625	0.37	0.2	1.65	7	0.48
12...	1215	28	9.3	26	5.0	10	2.96	0.609	0.36	0.3	1.82	9	0.47
21...	1330	199	9.8	22	5.0	8	2.28	0.477	4.24	0.2	1.19	5	0.34
JUN
02...	1615	569	10.6	16	7.5	5	1.63	0.330	0.30	0.2	0.91	4	0.21
18...	1330	457	9.2	13	6.9	5	1.40	0.267	0.200	0.2	0.81	4	0.16
JUL
08...	1245	167	8.5	14	10.5	5	1.46	0.257	0.169	0.2	0.90	4	0.16
AUG
14...	1130	31	8.2	19	13.0	6	1.98	0.351	0.203	0.2	1.14	6	0.10
SEP
16...	1255	27	9.1	20	8.2	6	1.96	0.384	0.207	0.2	1.03	6	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...	--	2.00	--	--	--	--	--	--	--	--	--
NOV
22...	6.08	1.91	17	0.02	0.18	--	--	--	--	--	1.2
MAR
03...	7.62	2.01	21	0.03	0.34	0.25	0.013	0.177	E.001	<0.003	1.2
MAY
01...	7.51	2.88	22	0.03	2.97	0.25	<0.015	0.156	<0.007	0.006	6.9
12...	7.44	2.89	22	0.03	1.66	0.24	<0.015	0.064	<0.007	0.010	6.4
21...	6.20	1.99	20	0.03	11.0	0.28	<0.015	0.122	<0.007	0.015	7.1
JUN
02...	4.83	1.44	12	0.02	19.0	0.22	<0.015	0.111	<0.007	0.015	5.6
18...	4.39	1.13	11	0.01	13.4	0.15	<0.015	0.067	<0.007	0.012	3.9
JUL
08...	3.55	1.05	10	0.01	4.61	1.8	<0.015	0.042	<0.007	0.006	2.2
AUG
14...	4.03	1.29	13	0.02	1.11	E.07	<0.015	0.081	<0.007	0.004	1.5
SEP
16...	4.51	1.65	14	0.02	1.01	E.07	<0.015	0.127	<0.007	0.004	1.6
< -- Actual value is known to be less than the value shown. E -- Estimated laboratory analysis value.