GRAND LAKE OUTLET BASIN

THREE LAKES WATER-QUALITY STUDY-Continued

09013900 GRAND LAKE AT GRAND LAKE, CO

WATER-QUALITY RECORDS

LOCATION.--Lat 40°14'41", long 105°49'32", in NE14SW14 sec.5, T.3 N., R.75 W., Grand County, Hydrologic Unit 14010001, between North Inlet and Shadow Mountain Lake Inlet channel, approximately 0.6 mi south southeast of the town of Grand Lake.

DRAINAGE AREA.--76.3 mi2.

PERIOD OF RECORD.--November 1973 to June 1975, 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=09013900

REMARKS.--Each sample is a composite of three equally-spaced point samples of equal volume. The surface sample is collected in the depth interval from the surface to twice the secchi disk depth (photic zone approximation.) The bottom sample is collected in the interval from twice the secchi depth to the reservoir bottom.

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

Date	Time	Sam- pling depth, feet (00003)	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)
OCT
15...	0958	0.50	7.2	7.3	49	9.2
15...	0959	5.00	7.2	7.3	49	9.2
15...	1000	10.0	7.1	7.3	48	9.2
15...	1001	15.0	7.2	7.3	48	9.2
15...	1002	20.0	7.1	7.3	48	9.2
15...	1003	25.0	7.1	7.3	47	9.2
15...	1004	30.0	7.1	7.3	47	9.2
15...	1005	35.0	7.1	7.3	47	9.2
15...	1006	40.0	7.0	7.3	47	9.2
15...	1007	45.0	7.1	7.3	47	9.2
15...	1008	50.0	5.8	6.9	44	8.4
15...	1009	55.0	5.2	6.8	42	7.6
15...	1010	60.0	5.0	6.8	43	6.4
15...	1011	65.0	5.0	6.8	44	6.1
15...	1012	70.0	5.2	6.7	45	5.8
15...	1013	75.0	5.2	6.7	46	5.6
15...	1014	80.0	5.1	6.7	46	5.5
15...	1015	85.0	5.2	6.7	47	5.3
15...	1016	90.0	5.2	6.7	47	5.2
15...	1017	100	5.2	6.7	48	4.9
15...	1018	110	5.2	6.7	49	4.6
15...	1019	120	5.1	6.7	49	4.5
15...	1020	130	5.1	6.7	49	4.4
15...	1021	140	5.0	6.7	49	4.3
15...	1022	150	5.1	6.7	49	4.2
15...	1023	160	5.0	6.7	49	4.2
15...	1024	170	4.9	6.7	49	4.2
15...	1025	180	4.8	6.7	49	4.2
15...	1026	190	4.4	6.7	49	4.1
15...	1027	200	4.3	6.6	49	4.1
15...	1028	210	3.9	6.6	50	4.1
15...	1029	220	3.5	6.6	50	4.1
15...	1030	230	2.9	6.6	50	4.1

09013900 GRAND LAKE AT GRAND LAKE, CO-Continued

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

Date	Time	Sam- pling depth, feet (00003)	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)
NOV
05...	0956	0.50	7.2	7.0	44	6.1
05...	0957	5.00	7.2	7.0	44	6.1
05...	0958	10.0	7.2	6.9	44	6.1
05...	0959	15.0	7.2	6.9	44	6.1
05...	1000	20.0	7.2	6.9	44	6.1
05...	1001	25.0	7.1	6.9	44	6.1
05...	1002	30.0	7.1	6.9	43	6.1
05...	1003	35.0	7.0	6.9	43	6.1
05...	1004	40.0	7.1	6.9	44	6.1
05...	1005	45.0	7.0	6.9	43	6.0
05...	1006	50.0	6.9	6.8	44	5.9
05...	1007	55.0	6.6	6.8	44	5.8
05...	1008	60.0	6.5	6.8	44	5.7
05...	1009	65.0	6.5	6.8	45	5.7
05...	1010	70.0	6.5	6.7	45	5.7
05...	1011	75.0	6.6	6.7	45	5.6
05...	1012	80.0	6.6	6.8	45	5.6
05...	1013	85.0	6.7	6.8	45	5.4
05...	1014	90.0	6.7	6.8	45	5.2
05...	1015	100	6.2	6.7	46	5.0
05...	1016	110	5.8	6.5	45	5.0
05...	1017	120	5.0	6.5	46	4.8
05...	1018	130	5.0	6.5	46	4.8
05...	1019	140	4.9	6.4	46	4.5
05...	1020	150	4.8	6.4	47	4.4
05...	1021	160	4.8	6.4	47	4.3
05...	1022	170	4.7	6.4	47	4.3
05...	1023	180	4.7	6.4	47	4.2
05...	1024	190	4.6	6.4	47	4.2
05...	1025	200	4.4	6.3	47	4.1
05...	1026	210	3.6	6.3	47	4.1
05...	1027	220	1.3	6.2	48	4.1
JAN
23...	0902	0.50	9.3	6.6	40	0.4
23...	0903	5.00	8.0	6.6	62	1.7
23...	0904	10.0	7.5	6.6	63	2.0
23...	0905	15.0	7.3	6.6	62	2.1
23...	0906	20.0	7.1	6.6	61	2.2
23...	0907	25.0	7.0	6.6	59	2.4
23...	0908	30.0	6.9	6.6	58	2.5
23...	0909	35.0	6.7	6.6	57	2.7
23...	0910	40.0	6.5	6.5	55	3.0
23...	0911	45.0	6.3	6.5	53	3.3
23...	0912	50.0	6.1	6.5	53	3.4
23...	0913	55.0	6.1	6.5	53	3.4
23...	0914	60.0	6.0	6.5	53	3.4
23...	0915	65.0	6.1	6.5	52	3.4
23...	0916	70.0	6.1	6.5	53	3.4
23...	0917	75.0	6.0	6.5	52	3.4
23...	0918	80.0	6.1	6.5	53	3.4
23...	0919	85.0	6.0	6.5	53	3.4
23...	0920	90.0	6.0	6.5	52	3.4
23...	0921	100	6.1	6.5	52	3.4
23...	0922	110	6.1	6.5	52	3.4
23...	0923	120	6.2	6.5	52	3.4
23...	0924	130	6.1	6.5	52	3.4
23...	0925	140	6.0	6.4	52	3.4
23...	0926	150	6.0	6.4	52	3.4
23...	0927	160	6.1	6.5	53	3.4
23...	0928	170	6.1	6.5	53	3.4
23...	0929	180	6.2	6.4	53	3.4
23...	0930	190	6.2	6.4	53	3.4
23...	0931	200	5.9	6.4	53	3.4
23...	0932	210	6.0	6.4	53	3.4
23...	0933	220	5.9	6.4	53	3.4
23...	0934	230	5.3	6.4	53	3.4

09013900 GRAND LAKE AT GRAND LAKE, CO-Continued

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

Date	Time	Sam- pling depth, feet (00003)	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)
MAY
29...	1020	0.50	7.8	6.8	59	7.5
29...	1021	5.00	7.7	6.8	51	5.1
29...	1022	10.0	7.5	6.7	48	4.9
29...	1023	15.0	7.4	6.7	47	4.8
29...	1024	20.0	7.5	6.7	44	4.7
29...	1025	25.0	7.5	6.6	43	4.7
29...	1026	30.0	7.4	6.6	42	4.7
29...	1027	35.0	7.3	6.6	40	4.6
29...	1028	40.0	7.2	6.6	41	4.5
29...	1029	45.0	7.2	6.6	43	4.4
29...	1030	50.0	7.1	6.6	44	4.4
29...	1031	55.0	7.0	6.6	46	4.5
29...	1032	60.0	7.0	6.6	45	4.4
29...	1033	65.0	7.0	6.6	45	4.4
29...	1034	70.0	6.8	6.6	47	4.3
29...	1035	75.0	6.7	6.6	47	4.3
29...	1036	80.0	6.8	6.6	47	4.3
29...	1037	85.0	6.7	6.6	47	4.2
29...	1038	90.0	6.6	6.6	47	4.2
29...	1039	100	6.6	6.6	46	4.2
29...	1040	110	6.1	6.6	50	3.9
29...	1041	120	5.7	6.6	51	3.8
29...	1042	130	5.7	6.6	49	3.8
29...	1043	140	5.6	6.6	50	3.7
29...	1044	150	5.4	6.6	50	3.7
29...	1045	160	5.3	6.6	50	3.6
29...	1046	170	5.2	6.6	50	3.6
29...	1047	180	5.1	6.5	50	3.6
29...	1048	190	5.0	6.5	50	3.6
29...	1049	200	4.6	6.5	51	3.6
29...	1051	210	4.7	6.5	51	3.6
29...	1052	220	4.5	6.5	51	3.6
JUL
15...	1000	0.50	7.8	7.6	27	15.4
15...	1001	5.00	7.9	7.6	22	14.9
15...	1002	10.0	8.4	7.6	16	12.7
15...	1003	15.0	8.3	7.6	15	11.7
15...	1004	20.0	8.1	7.6	13	10.4
15...	1005	25.0	8.1	7.5	12	9.8
15...	1006	30.0	8.0	7.4	11	9.1
15...	1007	35.0	8.0	7.4	12	8.0
15...	1008	40.0	7.9	7.4	13	7.5
15...	1009	45.0	7.9	7.3	14	7.1
15...	1010	50.0	7.9	7.3	15	6.8
15...	1011	55.0	7.9	7.3	14	6.7
15...	1012	60.0	7.8	7.3	14	6.5
15...	1013	65.0	7.7	7.2	14	6.2
15...	1014	70.0	7.7	7.2	15	5.9
15...	1015	75.0	7.5	7.2	16	5.8
15...	1016	80.0	7.5	7.2	17	5.7
15...	1017	85.0	7.4	7.2	17	5.5
15...	1018	90.0	7.4	7.2	18	5.4
15...	1019	100	7.2	7.2	20	5.0
15...	1020	110	6.8	7.2	23	4.7
15...	1021	120	6.6	7.1	24	4.5
15...	1022	130	6.5	7.1	25	4.4
15...	1023	140	6.2	7.1	27	4.2
15...	1024	150	6.1	7.1	27	4.2
15...	1025	160	5.9	7.1	28	4.1
15...	1026	170	5.7	7.1	29	4.0
15...	1027	180	5.6	7.1	30	4.0
15...	1028	190	5.5	7.1	30	3.9
15...	1029	200	5.4	7.1	31	3.9
15...	1030	210	5.2	7.1	31	3.8
15...	1031	210	4.8	7.0	31	3.8
15...	1032	230	4.7	7.0	32	3.8
15...	1033	240	4.3	7.0	32	3.7

09013900 GRAND LAKE AT GRAND LAKE, CO-Continued

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

Date	Time	Sam- pling depth, feet (00003)	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)
AUG
20...	1015	0.50	7.4	7.1	31	16.6
20...	1016	5.00	7.4	7.1	31	16.3
20...	1017	10.0	7.3	7.2	22	15.0
20...	1018	15.0	7.2	7.1	24	14.1
20...	1019	20.0	7.2	7.1	19	12.5
20...	1020	25.0	6.6	7.0	14	10.7
20...	1021	30.0	6.7	7.0	14	9.3
20...	1022	35.0	6.8	6.9	13	8.5
20...	1023	40.0	6.7	6.9	14	8.2
20...	1024	45.0	6.8	6.8	15	7.4
20...	1025	50.0	7.0	6.7	15	7.1
20...	1026	55.0	7.0	6.7	14	6.7
20...	1027	60.0	7.0	6.7	15	6.5
20...	1028	65.0	7.0	6.7	15	6.3
20...	1029	70.0	7.0	6.7	15	6.1
20...	1030	75.0	7.0	6.6	16	5.9
20...	1031	80.0	6.9	6.6	17	5.8
20...	1032	85.0	6.9	6.6	18	5.6
20...	1033	90.0	6.9	6.6	18	5.4
20...	1034	100	6.6	6.6	20	5.1
20...	1035	110	6.4	6.6	22	4.9
20...	1036	120	6.2	6.6	23	4.7
20...	1037	130	6.1	6.6	25	4.5
20...	1038	140	6.1	6.6	25	4.4
20...	1039	150	5.8	6.5	26	4.3
20...	1040	160	5.8	6.6	27	4.2
20...	1041	170	5.6	6.5	28	4.1
20...	1042	180	5.3	6.5	29	4.1
20...	1043	190	5.3	6.5	29	4.0
20...	1044	200	5.0	6.5	31	4.0
20...	1045	210	4.6	6.5	31	3.9
20...	1046	220	4.3	6.5	30	3.8
20...	1047	230	3.8	6.5	32	3.8
SEP
16...	0954	0.50	8.2	6.9	50	11.8
16...	0955	5.00	8.2	6.9	48	11.8
16...	0956	10.0	8.2	7.0	43	11.8
16...	0957	15.0	8.2	7.0	43	11.8
16...	0958	20.0	7.2	7.0	31	11.2
16...	0959	25.0	6.9	6.9	25	10.6
16...	1000	30.0	6.8	6.9	20	9.6
16...	1001	35.0	6.4	6.9	16	9.6
16...	1002	40.0	6.3	6.8	15	8.3
16...	1003	45.0	6.4	6.7	15	7.9
16...	1004	50.0	6.5	6.7	15	7.3
16...	1005	55.0	6.6	6.7	16	7.0
16...	1006	60.0	6.7	6.6	17	6.5
16...	1007	65.0	6.7	6.6	18	6.3
16...	1008	70.0	6.8	6.6	19	6.1
16...	1009	75.0	6.8	6.6	19	5.8
16...	1010	80.0	6.7	6.5	21	5.7
16...	1011	85.0	6.6	6.5	21	5.5
16...	1012	90.0	6.5	6.5	22	5.4
16...	1013	100	6.4	6.5	24	5.1
16...	1014	110	6.3	6.5	26	4.9
16...	1015	120	6.2	6.5	28	4.7
16...	1016	130	6.1	6.5	28	4.6
16...	1017	140	6.0	6.5	29	4.5
16...	1018	150	5.7	6.4	31	4.3
16...	1019	160	5.6	6.4	31	4.3
16...	1020	170	5.4	6.4	32	4.2
16...	1021	180	5.2	6.4	33	4.1
16...	1022	190	5.1	6.4	33	4.1
16...	1023	200	4.8	6.4	34	4.0
16...	1024	210	4.5	6.4	35	3.9
16...	1025	220	4.3	6.4	35	3.9
16...	1026	230	3.5	6.4	36	3.8

09013900 GRAND LAKE AT GRAND LAKE, CO-Continued

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

Date	Time	Trans- parency Secchi disc, inches (00077)	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)	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)	Organic carbon, water, unfltrd mg/L (00680)
OCT
15...	1035	204	7.1	7.3	48	9.2	0.07	0.005	0.028	0.002	--	3.8	--
15...	1045	--	5.0	6.7	49	4.3	0.17	--	0.080	0.002	--	3.7	--
NOV
05...	1040	168	7.2	6.9	44	6.1	E.06	E.004	0.042	E.002	E.008	2.9	2.8
05...	1055	--	5.0	6.5	46	4.5	<0.05	E.006	0.095	E.002	E.008	3.5	2.6
JAN
23...	0940	--	7.5	6.6	63	2.0	--	--	--	--	--	2.3	2.9
23...	0950	--	6.1	6.5	52	3.4	--	--	--	--	--	2.3	2.9
MAY
29...	1050	156	7.8	6.8	59	7.5	0.20	<0.015	0.070	<0.007	0.010	3.6	4.1
29...	1100	--	4.5	6.5	51	3.6	0.21	<0.015	0.083	<0.007	0.009	3.2	3.3
JUL
15...	1040	149	7.8	7.6	27	15.4	0.16	<0.015	E.016	<0.007	0.006	3.1	3.0
15...	1055	--	4.3	7.0	32	3.7	0.17	<0.015	0.087	<0.007	0.006	3.7	4.0
AUG
20...	1050	96.0	7.2	7.1	22	15.0	0.21	<0.015	<0.022	<0.007	0.010	3.0	4.2
20...	1100	--	6.1	6.6	25	4.5	0.13	<0.015	0.082	<0.007	0.007	3.3	4.1
SEP
16...	1030	78.0	8.2	6.9	48	11.8	0.32	<0.015	<0.022	<0.007	0.014	3.4	4.8
16...	1045	--	3.5	6.4	36	3.8	0.16	<0.015	0.082	<0.007	0.008	3.4	3.6

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

Date	Chloro- phyll a phyto- plank- ton, fluoro, ug/L (70953)	Chloro- phyll b phyto- plank- ton, fluoro, ug/L (70954)
OCT
15...	2.6	2.4
15...	--	--
NOV
05...	4.3	1.4
05...	--	--
JAN
23...	--	--
23...	--	--
MAY
29...	2.3	0.2
29...	--	--
JUL
15...	0.8	<0.1
15...	--	--
AUG
20...	E.7	<0.1
20...	--	--
SEP
16...	E4.1	E.4
16...	--	--
< -- Actual value is known to be less than the value shown. E -- Estimated laboratory analysis value.