COLORADO RIVER MAIN STEM

THREE LAKES WATER-QUALITY STUDY-Continued

09018500 LAKE GRANBY NEAR GRANBY, CO

WATER-QUALITY RECORDS

LOCATION.--Lat 40°08'59", long 105°51'39", in SW14NW14 sec.12, T.2 N., R.76 W., Grand County, Hydrologic Unit 14010001, near Granby Dam and approximately 6 mi northeast of Granby.

DRAINAGE AREA.--312 mi2.

PERIOD OF RECORD.--November 1973 to June 1975, June 1979 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=09018500

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...	1159	0.50	6.5	7.3	60	10.4
15...	1200	5.00	6.5	7.2	60	10.2
15...	1201	10.0	6.4	7.2	59	10.0
15...	1202	15.0	6.4	7.2	59	9.9
15...	1203	20.0	6.4	7.2	59	9.9
15...	1204	25.0	6.4	7.2	59	9.9
15...	1205	30.0	6.4	7.2	60	9.9
15...	1206	35.0	6.3	7.2	60	9.9
15...	1207	40.0	6.3	7.2	60	9.8
15...	1208	45.0	6.3	7.2	60	9.8
15...	1209	50.0	6.3	7.2	60	9.8
15...	1210	55.0	6.3	7.3	61	9.7
15...	1211	60.0	5.6	7.1	62	9.6
15...	1212	65.0	5.7	7.2	61	9.6
15...	1213	70.0	6.1	7.2	61	9.6
15...	1214	75.0	6.2	7.2	61	9.6
15...	1215	80.0	6.0	7.2	62	9.6
15...	1216	85.0	4.6	7.0	62	9.4
15...	1217	90.0	3.9	6.9	62	9.4
NOV
05...	1152	0.50	7.3	7.1	58	7.1
05...	1153	5.00	7.3	7.2	57	7.1
05...	1154	10.0	7.2	7.2	57	7.1
05...	1155	15.0	7.2	7.1	57	7.1
05...	1156	20.0	7.2	7.1	57	7.1
05...	1157	25.0	7.2	7.1	57	7.1
05...	1158	30.0	7.1	7.1	57	7.1
05...	1159	35.0	7.2	7.1	57	7.1
05...	1200	40.0	7.1	7.1	57	7.0
05...	1201	45.0	7.1	7.1	57	7.0
05...	1202	50.0	7.1	7.1	57	7.0
05...	1203	55.0	7.1	7.1	57	7.0
05...	1204	60.0	7.1	7.1	57	7.0
05...	1205	65.0	7.1	7.1	57	7.0
05...	1206	70.0	7.0	7.1	57	7.0
05...	1207	75.0	7.0	7.1	57	7.0
05...	1208	80.0	7.1	7.1	57	7.0
05...	1209	85.0	7.0	7.1	57	7.0
05...	1210	90.0	7.0	7.1	57	7.0
05...	1211	100	7.1	7.1	57	7.0
JAN
22...	1117	0.50	9.1	6.5	77	0.4
22...	1118	5.00	8.4	6.6	69	1.9
22...	1119	10.0	8.2	6.6	66	2.4
22...	1120	15.0	7.7	6.5	65	2.6
22...	1121	20.0	7.3	6.5	64	2.8
22...	1122	25.0	7.1	6.4	63	2.9
22...	1123	30.0	6.8	6.4	61	3.2
22...	1124	35.0	6.6	6.4	61	3.3
22...	1125	40.0	6.4	6.3	60	3.3
22...	1126	45.0	6.3	6.3	61	3.3
22...	1127	50.0	6.3	6.3	61	3.2
22...	1128	55.0	5.9	6.2	60	3.3
22...	1129	60.0	5.2	6.2	60	3.4
22...	1130	65.0	4.9	6.1	61	3.4
22...	1131	70.0	4.5	6.1	61	3.4
22...	1132	75.0	4.1	6.1	61	3.6
22...	1133	80.0	3.8	6.0	61	3.6
22...	1134	85.0	3.0	6.0	62	3.7
22...	1135	90.0	2.4	6.0	65	3.9

09018500 LAKE GRANBY NEAR GRANBY, 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...	1213	0.50	8.6	7.7	62	13.5
29...	1214	5.00	8.8	7.8	66	12.4
29...	1215	10.0	8.5	7.6	61	11.1
29...	1216	15.0	8.0	7.3	56	9.8
29...	1217	20.0	7.6	7.2	55	9.4
29...	1218	25.0	7.4	7.0	64	8.7
29...	1219	30.0	7.3	7.0	73	8.1
29...	1220	35.0	7.0	7.0	70	7.6
29...	1221	40.0	7.0	6.9	71	7.3
29...	1222	45.0	6.8	6.9	73	6.8
29...	1223	50.0	6.5	6.9	74	6.2
29...	1224	55.0	6.3	6.9	75	5.9
29...	1225	60.0	6.0	6.8	76	5.7
29...	1226	65.0	5.9	6.8	77	5.6
29...	1227	70.0	5.9	6.8	80	5.2
29...	1228	75.0	5.7	6.8	81	5.2
29...	1229	80.0	5.7	6.8	82	5.1
29...	1230	85.0	5.6	6.8	85	4.9
29...	1231	90.0	5.4	6.8	88	4.7
JUL
15...	1205	0.50	6.8	7.0	39	19.2
15...	1206	5.00	6.9	7.0	37	18.4
15...	1207	10.0	6.8	7.0	36	18.1
15...	1208	15.0	6.6	7.0	36	17.8
15...	1209	20.0	6.2	7.0	36	17.3
15...	1210	25.0	5.0	7.0	39	14.6
15...	1211	30.0	5.2	6.9	39	13.6
15...	1212	35.0	5.5	6.9	37	12.4
15...	1213	40.0	5.6	6.9	35	11.6
15...	1214	45.0	5.8	6.9	34	11.1
15...	1215	50.0	5.6	6.9	35	9.4
15...	1216	55.0	5.3	6.9	37	8.7
15...	1217	60.0	5.1	6.9	38	8.3
15...	1218	65.0	5.0	6.8	39	8.2
15...	1219	70.0	4.9	6.8	39	7.9
15...	1220	75.0	4.8	6.8	40	7.6
15...	1221	80.0	4.6	6.8	41	7.4
15...	1222	85.0	4.5	6.8	42	7.3
15...	1223	90.0	4.5	6.8	42	7.2
15...	1224	100	4.5	6.8	42	7.2
15...	1225	110	4.5	6.8	42	7.1
15...	1226	120	4.4	6.8	43	7.0
15...	1227	130	4.4	6.8	43	7.0
15...	1228	140	4.3	6.8	43	6.9
15...	1229	150	4.3	6.8	43	6.9
15...	1230	160	4.2	6.8	44	6.8
AUG
20...	1243	0.50	6.1	7.1	37	19.9
20...	1244	5.00	6.2	7.2	36	18.7
20...	1245	10.0	6.1	7.2	37	18.5
20...	1246	15.0	6.0	7.2	37	18.4
20...	1247	20.0	6.0	7.2	37	18.3
20...	1248	25.0	5.6	7.1	36	17.9
20...	1249	30.0	3.0	7.1	37	15.5
20...	1250	35.0	3.8	7.0	35	13.5
20...	1251	40.0	4.2	7.0	35	11.8
20...	1252	45.0	4.4	6.9	35	10.5
20...	1253	50.0	4.3	6.9	35	10.0
20...	1254	55.0	4.2	6.9	36	9.3
20...	1255	60.0	3.9	6.9	37	8.8
20...	1256	65.0	3.8	6.8	38	8.4
20...	1257	70.0	3.7	6.8	39	8.2
20...	1258	75.0	3.6	6.8	39	8.0
20...	1259	80.0	3.6	6.8	39	7.9
20...	1300	85.0	3.5	6.8	39	7.9
20...	1301	90.0	3.6	6.8	40	7.8
20...	1302	100	3.5	6.8	39	7.8
20...	1303	110	3.4	6.7	39	7.7
20...	1304	120	3.4	6.7	40	7.6
20...	1305	130	3.3	6.7	40	7.6
20...	1306	140	3.3	6.7	40	7.5

09018500 LAKE GRANBY NEAR GRANBY, 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)
SEP
16...	1146	0.50	6.7	7.0	43	15.0
16...	1147	5.00	6.7	7.1	42	14.8
16...	1148	10.0	6.7	7.1	42	14.6
16...	1149	15.0	6.6	7.1	42	14.5
16...	1150	20.0	6.6	7.1	42	14.5
16...	1151	25.0	6.5	7.1	42	14.5
16...	1152	30.0	6.4	7.1	42	14.5
16...	1153	35.0	6.1	7.0	43	14.3
16...	1154	40.0	5.5	7.0	42	14.1
16...	1155	45.0	3.2	7.0	42	12.2
16...	1156	50.0	3.2	6.9	42	11.3
16...	1157	55.0	3.4	6.9	42	10.2
16...	1158	60.0	3.4	6.8	43	9.2
16...	1159	65.0	3.3	6.8	44	9.0
16...	1200	70.0	3.0	6.8	45	8.4
16...	1201	75.0	3.0	6.8	45	8.3
16...	1202	80.0	2.9	6.8	46	8.1
16...	1203	85.0	2.8	6.7	46	8.0
16...	1204	90.0	2.8	6.7	46	8.0
16...	1205	100	2.8	6.7	46	7.9
16...	1206	110	2.7	6.7	46	7.8
16...	1207	120	2.6	6.7	46	7.8

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...	1220	204	6.4	7.2	59	9.9	--	--	0.025	0.007	0.003	2.9	--
15...	1230	--	6.2	7.2	61	9.6	--	0.012	0.048	0.009	0.003	3.5	--
NOV
05...	1220	192	7.2	7.1	57	7.1	E.08	0.024	0.020	0.004	0.016	2.8	2.6
05...	1230	--	7.0	7.1	57	7.0	E.07	0.021	0.017	0.004	0.016	2.9	2.8
JAN
22...	1140	--	9.1	6.5	77	0.4	--	--	--	--	--	2.5	3.3
22...	1150	--	2.4	6.0	65	3.9	--	--	--	--	--	2.3	3.1
MAY
29...	1240	62.0	8.6	7.7	62	13.5	0.48	<0.015	<0.022	<0.007	0.031	4.1	5.5
29...	1250	--	8.6	7.7	62	13.5	0.28	0.022	0.085	<0.007	0.017	3.4	4.4
JUL
15...	1240	122	6.8	7.0	39	19.2	0.27	E.011	<0.022	<0.007	0.014	4.8	5.0
15...	1250	--	4.2	6.8	44	6.8	0.27	0.017	0.113	E.006	0.015	4.0	4.1
AUG
20...	1310	126	6.2	7.2	37	18.5	0.24	E.010	<0.022	<0.007	0.022	4.2	5.1
20...	1320	--	3.5	6.8	39	7.8	0.17	<0.015	0.143	0.008	0.021	3.9	4.9
SEP
16...	1210	162	6.7	7.1	42	14.6	0.24	<0.015	<0.022	<0.007	0.017	3.9	4.6
16...	1225	--	2.8	6.7	46	7.8	0.19	<0.015	0.160	0.008	0.021	3.9	5.1

09018500 LAKE GRANBY NEAR GRANBY, CO-Continued

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...	2.1	1.4
15...	--	--
NOV
05...	1.7	0.6
05...	--	--
JAN
22...	--	--
22...	--	--
MAY
29...	10.6	1.4
29...	--	--
JUL
15...	1.6	<0.1
15...	--	--
AUG
20...	E1.0	<0.1
20...	--	--
SEP
16...	E1.1	<0.1
16...	--	--
< -- Actual value is known to be less than the value shown. E -- Estimated laboratory analysis value.