PLATTE RIVER BASIN

BIG THOMPSON PROJECT

06741530 BIG THOMPSON RIVER AT I-25 NEAR LOVELAND, CO

WATER-QUALITY RECORDS

LOCATION.--Lat 40°23'51", long 104°59'32", in NW14SW14 sec.15, T.5 N., R.68 W., Larimer County, Hydrologic Unit 10190006, at bridge on Big Thompson River on north bound lane of service road, east of Interstate Highway 25 (I-25), 1.5 mi downstream from Hillsboro Ditch, and 4.5 mi east of Loveland.

DRAINAGE AREA.--571mi2.

PERIOD OF RECORD.--April 1987 to December 1992, and March 2001 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=06741530

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
10...	1110	1.3	2.7	--	8.2	941	13.0	400	94.3	39.2	3.66	1	52.7
NOV
21...	1035	7.8	1.5	11.1	8.1	1,130	8.0	410	93.6	42.2	7.30	2	81.3
DEC
12...	1040	7.3	2.0	10.0	7.3	1,190	4.0	450	104	47.1	7.41	2	85.6
JAN
16...	1035	6.8	1.8	8.7	8.1	1,190	2.5	470	108	48.5	8.81	2	88.1
FEB
13...	1040	8.2	2.3	8.4	8.1	1,190	5.0	440	101	45.1	8.00	2	88.9
MAR
27...	1220	21	7.8	12.0	8.4	1,650	8.0	660	142	74.0	6.59	2	135
APR
17...	1005	12	4.2	10.0	8.4	1,480	11.0	580	126	63.9	7.70	2	114
MAY
08...	1315	16	3.5	7.0	8.1	1,420	13.5	530	118	56.0	7.91	2	110
22...	1110	11	2.1	6.0	7.9	1,470	16.5	560	119	64.0	8.03	2	117
JUN
05...	1115	91	11	8.8	8.1	305	12.5	110	25.3	11.4	1.61	0.7	17.8
19...	1100	172	79	7.6	8.0	470	15.5	160	37.6	16.8	3.66	1	29.6
JUL
10...	1055	38	36	9.3	8.4	635	18.5	240	55.5	25.7	2.50	1	37.8
24...	0955	41	9.7	8.0	7.9	703	21.0	270	62.3	28.9	2.55	1	39.5
AUG
14...	1030	30	10	7.6	8.1	651	21.0	280	66.6	28.1	2.89	0.9	36.4
SEP
11...	0955	18	6.7	8.5	8.2	832	15.5	310	70.3	31.5	3.10	1	44.0

06741530 BIG THOMPSON RIVER AT I-25 NEAR LOVELAND, 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
10...	E127	16.4	322	--	--	--	664	0.50	0.023	5.28	0.641	0.73	0.70
NOV
21...	115	34.9	373	763	1.13	17.6	833	0.93	0.026	12.6	1.88	2.07	1.95
DEC
12...	E132	34.3	394	--	--	--	852	1.0	0.054	9.70	1.87	1.87	2.26
JAN
16...	151	35.7	395	821	1.19	16.1	874	5.0	3.65	8.13	2.11	2.31	2.50
FEB
13...	148	41.4	381	798	1.13	18.3	829	5.5	3.98	7.18	2.17	2.25	2.54
MAR
27...	199	42.1	636	1,180	1.75	71.6	1,290	3.8	2.50	3.63	0.95	1.10	1.14
APR
17...	161	42.5	533	1,020	1.50	36.9	1,100	2.5	1.20	7.32	1.69	1.84	1.96
MAY
08...	145	43.9	508	973	1.44	45.4	1,060	2.8	1.47	7.93	1.49	1.75	1.82
22...	163	43.8	529	1,020	1.51	34.0	1,110	2.8	1.46	7.70	1.46	1.73	1.70
JUN
05...	44	6.76	82.3	176	0.27	49.1	199	0.58	0.037	0.877	0.159	0.179	0.27
19...	62	8.21	145	283	0.43	148	319	1.5	0.093	0.944	0.125	0.149	0.34
JUL
10...	84	10.2	217	405	0.60	45.4	441	0.76	0.027	1.22	0.196	0.22	0.34
24...	90	11.4	243	448	0.66	54.0	487	0.52	0.024	1.26	0.194	0.21	0.25
AUG
14...	97	11.2	208	419	0.60	35.2	442	0.52	0.026	1.46	0.217	0.23	0.28
SEP
11...	123	16.6	276	532	0.81	29.5	596	0.58	0.031	3.41	0.411	0.49	0.55

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
10...	1.0	3.3	27	0.18	29.1	<0.02	3.23	<0.2
NOV
21...	0.6	3.5	49	0.47	46.2	<0.02	4.85	<0.2
DEC
12...	0.7	4.0	57	0.49	65.4	<0.02	6.56	<0.2
JAN
16...	0.6	5.7	67	0.74	86.1	<0.02	5.64	E.1
FEB
13...	0.6	4.6	59	0.65	76.1	<0.02	4.83	<0.2
MAR
27...	0.9	3.6	37	0.51	106	<0.02	3.70	<0.2
APR
17...	0.8	3.4	52	0.29	112	<0.02	5.53	<0.2
MAY
08...	1.0	2.8	56	0.32	83.4	<0.02	5.54	<0.2
22...	1.0	6.7	49	0.33	90.6	<0.02	2.86	<0.2
JUN
05...	0.4	2.1	58	E.07	26.5	<0.02	0.78	<0.2
19...	0.7	2.1	47	0.14	25.6	<0.02	1.82	<0.2
JUL
10...	0.8	2.0	17	0.10	24.2	<0.02	2.34	<0.2
24...	1.1	2.9	16	E.05	25.6	<0.02	2.68	<0.2
AUG
14...	1.1	1.5	12	<0.08	24.0	<0.02	3.67	<0.2
SEP
11...	1.0	3.0	14	0.10	31.7	<0.02	1.06	<0.2
< -- Actual value is known to be less than the value shown. E -- Estimated laboratory analysis value.

06741530 BIG THOMPSON RIVER AT I-25 NEAR LOVELAND, 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
10...	<0.4	<0.4	<0.4	<0.4	<0.4
NOV
21...	<0.4	<0.4	<0.4	<0.4	<0.4
DEC
12...	<0.4	<0.4	<0.4	<0.4	<0.4
JAN
16...	<0.4	<0.4	<0.4	<0.4	<0.4
FEB
13...	<0.4	<0.4	<0.4	<0.4	<0.4
MAR
27...	<0.4	<0.4	<0.4	<0.4	<0.4
APR
17...	<0.4	<0.4	<0.4	<0.4	<0.4
MAY
08...	<0.4	<0.4	<0.4	<0.4	M
22...	<0.4	<0.4	<0.4	<0.4	M
JUN
05...	<0.4	<0.4	<0.4	<0.4	<0.4
19...	<0.4	<0.4	<0.4	<0.4	<0.4
JUL
10...	<0.4	<0.4	<0.4	<0.4	<0.4
24...	<0.4	<0.4	<0.4	<0.4	<0.4
AUG
15...	<0.4	<0.4	<0.4	<0.4	<0.4
SEP
11...	<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.