PLATTE RIVER BASIN

BIG THOMPSON PROJECT-Continued

402554105202100 BIG THOMPSON RIVER ABOVE NORTH FORK BIG THOMPSON RIVER AT DRAKE, CO

WATER-QUALITY RECORDS

LOCATION.--Lat 40°25'54", long 105°20'21", (unsurveyed), Larimer County, Hydrologic Unit 10190006, approximately 100 ft upstream of unnamed bridge on dead end road off Hwy 34, 400 ft upstream of inflow of North Fork Big Thompson River, in Drake.

DRAINAGE AREA.--191 mi2.

PERIOD OF RECORD.--August 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=402554105202100

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

Date	Time	Instan- taneous dis- charge, cfs (00061)	Turbid- ity, wat unf lab, Hach 2100AN NTU (99872)	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)	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)
OCT
08...	1100	36	12	--	8.2	73	8.5	25	7.34	1.58	0.99	0.4	4.41
NOV
19...	1140	18	<1.0	12.7	8.4	68	0.5	24	7.09	1.41	1.01	0.4	4.16
DEC
10...	1155	19	<1.0	12.2	8.0	77	0.5	25	7.58	1.57	1.07	0.4	4.44
JAN
14...	1155	24	E1.0	11.9	8.3	77	0.5	26	7.84	1.55	0.92	0.4	4.33
FEB
11...	1245	24	<1.0	11.8	8.8	89	0.5	30	8.93	1.80	1.20	0.4	5.39
MAR
25...	1315	47	2.5	10.5	8.6	166	5.5	44	12.9	2.81	2.36	0.8	12.7
APR
15...	1225	59	5.7	9.6	8.4	127	9.0	40	11.4	2.86	1.21	0.6	8.42
MAY
06...	1240	103	4.3	8.9	8.7	97	9.0	30	8.36	2.14	0.96	0.5	6.02
20...	1230	159	5.5	9.4	8.2	64	8.0	21	5.87	1.50	0.27	0.4	4.36
JUN
03...	1245	695	5.7	8.8	7.6	29	11.0	11	3.12	0.727	0.58	0.2	1.73
17...	1230	134	2.0	8.3	7.6	31	14.5	10	2.90	0.687	0.49	0.3	2.10
JUL
08...	1215	145	1.5	7.6	7.6	28	16.5	9	2.64	0.593	0.49	0.3	2.15
22...	1220	134	2.9	7.7	7.1	28	18.0	9	2.71	0.568	0.49	0.3	2.00
AUG
12...	1250	108	2.7	7.1	7.8	41	20.0	14	4.26	0.935	0.62	0.3	2.33
SEP
09...	1205	69	1.9	8.1	8.0	61	15.0	22	6.46	1.43	0.74	0.3	2.87

402554105202100 BIG THOMPSON RIVER ABOVE NORTH FORK BIG THOMPSON RIVER AT DRAKE, CO-Continued

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

Date	Alka- linity, wat flt fxd end lab, mg/L as CaCO3 (29801)	Chlor- ide, water, fltrd, mg/L (00940)	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)	Residue on evap. at 180degC wat flt mg/L (70300)	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, fltrd, mg/L (00666)	Phos- phorus, water, unfltrd mg/L (00665)
OCT
08...	E27	2.90	3.7	--	--	--	39	0.23	<0.015	0.424	0.044	0.053	0.064
NOV
19...	26	2.68	3.8	37	0.06	2.09	42	0.24	<0.015	0.339	0.037	0.049	0.050
DEC
10...	E26	3.01	4.0	--	--	--	49	0.23	<0.015	0.724	0.073	0.084	0.094
JAN
14...	30	2.25	3.8	41	0.07	3.42	53	0.35	0.108	0.511	0.079	0.084	0.108
FEB
11...	32	2.99	4.7	47	0.08	3.81	58	0.41	0.128	0.566	0.056	0.065	0.084
MAR
25...	29	22.2	8.2	83	0.15	14.1	112	0.54	0.055	0.938	0.030	0.046	0.078
APR
15...	28	13.3	8.8	65	0.11	13.4	84	0.56	E.011	0.425	0.011	0.024	0.117
MAY
06...	21	10.3	7.2	49	0.10	20.2	73	0.48	<0.015	0.235	0.014	0.023	0.074
20...	15	5.89	5.1	33	0.09	27.4	64	0.51	E.011	0.226	0.013	0.026	0.077
JUN
03...	10	1.61	2.2	17	0.05	67.7	36	0.60	<0.015	0.186	E.005	0.013	0.036
17...	9	2.15	2.2	17	0.04	11.6	32	0.21	<0.015	0.288	0.021	0.029	0.042
JUL
08...	9	1.85	2.0	17	0.03	8.95	23	0.27	0.016	0.277	0.046	0.059	0.075
22...	9	1.68	1.9	16	0.03	8.75	24	0.25	0.023	0.353	0.053	0.067	0.073
AUG
12...	15	1.72	2.7	23	0.04	8.61	30	0.23	<0.015	0.205	0.051	0.062	0.082
SEP
09...	22	2.29	3.8	33	0.06	7.76	42	0.31	E.011	0.369	0.048	0.058	0.084

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

Date	Arsenic water, fltrd, ug/L (01000)	Copper, water, fltrd, ug/L (01040)	Iron, water, fltrd, ug/L (01046)	Lead, water, fltrd, ug/L (01049)	Mangan- ese, water, fltrd, ug/L (01056)	Mercury water, fltrd, ug/L (71890)	Nickel, water, fltrd, ug/L (01065)	Silver, water, fltrd, ug/L (01075)
OCT
08...	E.2	0.8	56	E.06	2.0	<0.02	0.42	<0.20
NOV
19...	E.2	0.9	19	E.05	2.3	<0.02	0.43	<0.20
DEC
10...	E.2	1.3	17	<0.08	2.1	<0.02	0.58	<0.20
JAN
14...	E.2	0.8	13	0.18	2.8	<0.02	0.46	<0.20
FEB
11...	E.2	1.0	17	<0.08	1.4	<0.02	0.48	<0.20
MAR
25...	0.3	2.0	83	0.10	15.8	<0.02	0.55	<0.20
APR
15...	E.2	1.7	83	0.12	17.5	<0.02	0.73	<0.20
MAY
06...	E.2	1.5	108	E.06	7.4	<0.02	0.59	<0.20
20...	E.2	1.8	112	E.07	6.8	<0.02	0.38	<0.20
JUN
03...	E.2	1.3	82	<0.08	5.3	<0.02	0.34	<0.20
17...	<0.3	1.2	59	<0.08	2.2	<0.02	0.32	<0.20
JUL
08...	<0.3	0.9	63	E.04	2.3	<0.02	0.23	<0.20
22...	<0.3	0.9	63	E.04	1.7	<0.02	0.18	<0.20
AUG
12...	E.1	0.7	52	<0.08	2.3	<0.02	0.34	<0.20
SEP
09...	E.2	0.7	36	E.04	2.4	<0.02	0.21	<0.20
< -- Actual value is known to be less than the value shown. E -- Estimated laboratory analysis value.

402554105202100 BIG THOMPSON RIVER ABOVE NORTH FORK BIG THOMPSON RIVER AT DRAKE, CO-Continued

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

Date	Benzene water unfltrd ug/L (34030)	Ethyl- benzene water unfltrd ug/L (34371)	meta- + para- Xylene, water, unfltrd ug/L (85795)	o- Xylene, water, unfltrd ug/L (77135)	Toluene water unfltrd ug/L (34010)
OCT
08...	<0.4	<0.4	<0.4	<0.4	<0.4
NOV
19...	<0.4	<0.4	<0.4	<0.4	<0.4
DEC
10...	<0.4	<0.4	<0.4	<0.4	<0.4
JAN
14...	<0.4	<0.4	<0.4	<0.4	<0.4
FEB
11...	<0.4	<0.4	<0.4	<0.4	<0.4
MAR
25...	<0.4	<0.4	<0.4	<0.4	<0.4
APR
15...	<0.4	<0.4	<0.4	<0.4	<0.4
MAY
06...	<0.4	<0.4	<0.4	<0.4	<0.4
20...	<0.4	<0.4	<0.4	<0.4	<0.4
JUN
03...	<0.4	<0.4	<0.4	<0.4	<0.4
17...	<0.4	<0.4	<0.4	<0.4	<0.4
JUL
11...	<0.4	<0.4	<0.4	<0.4	<0.4
AUG
15...	<0.4	<0.4	<0.4	<0.4	<0.4
SEP
09...	<0.4	<0.4	<0.4	<0.4	<0.4
< -- Actual value is known to be less than the value shown.