COLORADO RIVER MAIN STEM

THREE LAKES WATER-QUALITY STUDY-Continued

09014500 SHADOW MOUNTAIN LAKE NEAR GRAND LAKE, CO

WATER-QUALITY RECORDS

LOCATION.--Lat 40°12'26", long 105°50'27", in SW14NW14 sec.19, T.3 N., R.75 W., Grand County, Hydrologic Unit 14010001, near Shadow Mountain Dam, approximately 3 mi south of Grand Lake.

DRAINAGE AREA.--185 mi2.

PERIOD OF RECORD.--May 1989 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=09014500

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

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...	1112	0.50	8.3	8.5	61	8.8
15...	1113	5.00	8.3	8.5	61	8.7
15...	1114	10.0	8.2	8.5	60	8.6
15...	1115	15.0	8.2	8.5	60	8.6
15...	1116	20.0	8.1	8.5	60	8.6
NOV
05...	1103	0.50	8.2	7.4	57	5.2
05...	1104	5.00	8.1	7.4	57	5.2
05...	1105	10.0	8.1	7.5	57	5.2
05...	1106	15.0	8.0	7.4	57	5.2
05...	1107	20.0	8.1	7.4	57	5.2
JAN
22...	1322	0.50	8.1	6.5	60	1.1
22...	1323	5.00	7.9	6.5	60	1.8
22...	1324	10.0	7.8	6.5	60	2.1
22...	1325	15.0	7.8	6.4	59	2.1
22...	1326	20.0	7.7	6.4	59	2.1
22...	1327	25.0	7.7	6.4	59	2.1
MAY
29...	1120	0.50	7.9	7.1	43	12.0
29...	1121	5.00	7.9	7.0	42	11.6
29...	1122	10.0	7.9	7.0	43	11.0
29...	1123	15.0	7.8	6.9	42	9.8
29...	1124	20.0	7.7	6.9	41	9.5
JUL
15...	1109	0.50	7.2	7.0	23	17.9
15...	1110	5.00	7.2	7.0	21	17.7
15...	1111	10.0	6.8	7.0	21	16.8
15...	1112	15.0	5.8	7.0	24	14.2
15...	1113	20.0	4.9	6.9	24	12.7
AUG
20...	1130	0.50	7.8	7.8	38	15.7
20...	1131	5.00	8.0	7.8	35	15.1
20...	1132	10.0	7.3	7.7	38	14.0
20...	1133	15.0	6.0	7.5	39	12.6
20...	1134	20.0	5.3	7.4	38	12.2
SEP
16...	1100	0.50	4.9	6.8	49	9.7
16...	1101	5.00	4.7	6.8	47	9.7
16...	1102	10.0	4.6	6.8	46	9.6
16...	1103	15.0	4.7	6.8	46	9.6
16...	1104	20.0	4.7	6.7	45	9.6
16...	1105	25.0	4.7	6.7	45	9.5

09014500 SHADOW MOUNTAIN LAKE NEAR 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...	1120	96.0	8.2	8.5	60	8.6	0.13	--	0.006	0.004	--	3.1	--
NOV
05...	1115	108	8.1	7.4	57	5.2	E.12	--	0.011	E.001	0.014	2.9	3.2
JAN
22...	1330	--	7.8	6.5	60	2.0	--	--	--	--	--	2.5	3.3
MAY
29...	1130	38.0	7.9	7.1	43	12.0	0.31	<0.015	E.012	<0.007	0.025	4.9	6.1
JUL
15...	1115	96.0	7.2	7.0	23	17.9	0.26	<0.015	<0.022	<0.007	0.015	3.5	4.2
AUG
20...	1140	72.0	7.3	7.7	38	15.1	0.30	<0.015	<0.022	<0.007	0.021	3.7	4.9
SEP
16...	1110	84.0	4.7	6.8	47	9.7	0.25	<0.015	0.133	E.006	0.028	3.9	4.4

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...	7.2	2.0
NOV
05...	3.4	0.5
JAN
22...	--	--
MAY
29...	4.2	0.2
JUL
15...	0.8	<0.1
AUG
20...	E1.6	<0.1
SEP
16...	E.9	<0.1
< -- Actual value is known to be less than the value shown. E -- Estimated laboratory analysis value.