PLATTE RIVER BASIN

BIG THOMPSON PROJECT-Continued

06735500 BIG THOMPSON RIVER NEAR ESTES PARK, CO

WATER-QUALITY RECORDS

LOCATION.-Lat 40°22'35", long 105°29'06", in NW14NE14 sec.29, T.5 N., R.72 W., Larimer County, Hydrologic Unit 10190006, on right bank, 100 ft upstream from Dry Gulch, 600 ft downstream from Olympus Dam in Estes Park.

DRAINAGE AREA.--155 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=06735500

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
07...	1140	36	2.5	9.2	8.0	52	10.0	20	5.91	1.24	0.64	0.3	2.65
NOV
18...	1150	26	1.1	10.2	7.9	51	3.5	20	6.15	1.22	0.62	0.2	1.98
DEC
09...	1135	25	1.2	10.6	8.3	56	3.5	22	6.66	1.30	0.68	0.2	2.10
JAN
13...	1145	24	1.9	12.0	8.2	62	2.0	25	7.78	1.45	0.69	0.2	2.40
FEB
10...	1225	22	<1.0	10.5	8.4	67	1.5	26	8.00	1.56	0.80	0.2	2.74
MAR
17...	1230	28	1.9	10.2	8.4	65	4.0	26	7.86	1.52	0.87	0.2	2.59
APR
14...	1130	25	3.1	9.9	9.1	107	8.0	35	9.70	2.57	1.30	0.4	5.91
MAY
05...	1230	86	2.3	9.8	7.8	89	9.5	28	7.75	2.05	0.83	0.4	4.94
19...	1125	100	6.2	9.2	7.9	53	8.5	18	4.87	1.30	0.70	0.3	3.03
JUN
02...	1150	737	6.5	11.2	7.6	20	7.5	8	2.21	0.580	0.55	0.2	1.18
16...	1135	123	2.4	9.7	7.3	19	10.0	7	2.10	0.520	0.34	0.2	1.08
JUL
07...	1220	124	1.6	7.7	7.5	20	15.0	7	2.17	0.486	0.31	0.2	1.24
21...	1120	130	3.2	7.7	--	18	16.0	7	2.00	0.469	0.31	0.2	1.13
AUG
11...	1210	123	2.2	7.1	7.7	32	19.0	12	3.65	0.769	0.35	0.2	1.38
SEP
08...	1130	74	2.3	8.0	8.2	51	16.0	20	5.94	1.26	0.52	0.2	1.82

06735500 BIG THOMPSON RIVER NEAR ESTES PARK, 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
07...	E22	1.28	2.8	--	--	--	35	0.29	0.017	0.066	<0.007	0.008	0.021
NOV
18...	23	0.64	2.8	28	0.05	2.40	35	0.20	E.009	0.060	<0.007	<0.004	0.004
DEC
09...	E25	0.61	2.7	--	--	--	44	0.19	0.016	0.058	<0.007	E.003	0.011
JAN
13...	29	0.39	2.9	33	0.06	2.85	44	0.21	E.010	0.042	<0.007	0.005	0.014
FEB
10...	30	1.37	3.2	36	0.07	2.93	49	0.16	<0.015	0.085	0.013	0.018	0.026
MAR
17...	29	1.46	3.0	35	0.06	3.04	41	0.17	<0.015	0.053	<0.007	0.006	0.016
APR
14...	27	10.8	6.6	54	0.10	4.69	70	0.40	E.008	0.187	<0.007	0.009	0.034
MAY
05...	19	9.47	6.4	45	0.10	16.8	73	0.33	E.011	0.293	<0.007	0.006	0.026
19...	13	4.59	4.0	27	0.06	12.8	48	0.38	0.018	0.166	<0.007	0.007	0.027
JUN
02...	6	0.91	1.9	12	0.04	57.4	29	0.25	E.008	0.190	<0.007	0.007	0.024
16...	7	0.75	1.6	12	0.04	9.27	28	0.22	E.012	0.147	<0.007	0.005	0.013
JUL
07...	8	0.80	1.5	12	0.03	6.63	20	0.20	E.013	0.094	<0.007	E.004	0.012
21...	8	0.58	1.4	11	0.03	7.00	20	0.17	0.031	0.071	<0.007	0.006	0.012
AUG
11...	13	0.77	2.2	17	0.04	8.85	27	0.21	0.041	0.024	<0.007	0.005	0.016
SEP
08...	23	1.03	3.3	27	0.05	7.39	37	0.48	0.016	E.014	<0.007	0.005	0.020

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
07...	0.3	0.6	106	E.04	3.3	<0.02	0.30	<0.20
NOV
18...	E.2	0.6	24	<0.08	4.7	<0.02	0.38	<0.20
DEC
09...	E.2	0.5	20	<0.08	4.7	<0.02	0.51	<0.20
JAN
13...	E.2	0.5	17	0.28	31.2	<0.02	0.40	<0.20
FEB
10...	E.2	0.5	29	<0.08	20.6	<0.02	0.42	<0.20
MAR
17...	E.2	0.6	39	<0.08	15.1	<0.02	0.33	<0.20
APR
14...	E.1	0.9	155	<0.08	4.5	<0.02	0.55	<0.20
MAY
05...	E.2	1.3	138	0.17	8.3	<0.02	0.54	<0.20
19...	E.2	1.6	120	E.08	8.3	<0.02	0.31	<0.20
JUN
02...	<0.3	1.4	101	E.05	8.6	<0.02	0.33	<0.20
16...	<0.3	1.0	82	E.05	9.1	<0.02	0.26	<0.20
JUL
07...	<0.3	0.8	66	E.07	6.1	<0.02	0.21	<0.20
21...	E.1	0.7	75	<0.08	7.0	<0.02	0.15	<0.20
AUG
11...	E.2	0.9	65	0.11	2.4	<0.02	0.29	<0.20
SEP
08...	E.2	0.6	39	E.04	1.6	<0.02	0.13	<0.20
< -- Actual value is known to be less than the value shown. E -- Estimated laboratory analysis value.

06735500 BIG THOMPSON RIVER NEAR ESTES PARK, 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
07...	<0.4	<0.4	<0.4	<0.4	<0.4
NOV
18...	<0.4	<0.4	<0.4	<0.4	<0.4
DEC
09...	<0.4	<0.4	<0.4	<0.4	<0.4
JAN
13...	<0.4	<0.4	<0.4	<0.4	<0.4
FEB
10...	<0.4	<0.4	<0.4	<0.4	<0.4
MAR
17...	<0.4	<0.4	<0.4	<0.4	<0.4
APR
14...	<0.4	<0.4	<0.4	<0.4	<0.4
MAY
05...	<0.4	<0.4	<0.4	<0.4	<0.4
19...	<0.4	<0.4	<0.4	<0.4	<0.4
JUN
02...	<0.4	<0.4	<0.4	<0.4	<0.4
16...	<0.4	<0.4	<0.4	<0.4	<0.4
JUL
07...	<0.4	<0.4	M	<0.4	M
21...	<0.4	<0.4	<0.4	<0.4	<0.4
AUG
15...	<0.4	<0.4	<0.4	<0.4	<0.4
SEP
08...	<0.4	<0.4	<0.4	<0.4	<0.4
< -- Actual value is known to be less than the value shown. M -- Presence of material verified but not quantified.