GUNNISON RIVER BASIN

CURECANTI WATER-QUALITY NETWORK-Continued

09128000 GUNNISON RIVER BELOW GUNNISON TUNNEL, CO

WATER-QUALITY RECORDS

LOCATION.--Lat 38°31'45", long 107°38'54", in NE14NW14 sec.10, T.49 N., R.7 W., Montrose County, Hydrologic Unit 14020002, on left bank 0.4 mi downstream from east portal of Gunnison tunnel, 4.7 mi downstream from Crystal Creek, and 12 mi northeast of Montrose.

PERIOD OF RECORD.--For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/
inventory/?site_no=09128000

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

Date	Time	Instan- taneous dis- charge, cfs (00061)	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)	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)	Nitrite water, fltrd, mg/L as N (00613)
MAR
12...	1137	269	11.0	8.5	236	3.5	110	31.2	7.10	E.07	<0.015	0.057	<0.002
APR
16...	0948	275	9.3	8.3	236	4.0	110	31.7	7.41	0.14	<0.015	0.052	<0.002
JUN
12...	1033	386	9.6	8.1	187	10.4	81	23.2	5.62	0.21	E.014	0.042	0.003
JUL
15...	1107	883	8.7	8.0	198	10.7	91	27.4	5.50	0.24	<0.015	0.048	<0.002
AUG
18...	1025	824	8.4	8.1	208	12.0	89	26.4	5.51	0.18	<0.015	0.060	E.002
28...	1228	672	8.7	8.2	210	12.5	100	29.9	6.37	0.18	<0.015	0.051	<0.002

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

Date	Ortho- phos- phate, water, fltrd, mg/L as P (00671)	Phos- phorus, water, unfltrd mg/L (00665)	Cadmium water, fltrd, ug/L (01025)	Copper, water, fltrd, ug/L (01040)	Lead, water, fltrd, ug/L (01049)	Mangan- ese, water, fltrd, ug/L (01056)	Selen- ium, water, fltrd, ug/L (01145)	Silver, water, fltrd, ug/L (01075)	Zinc, water, fltrd, ug/L (01090)
MAR
12...	E.005	0.016	<0.04	0.7	<0.08	1.6	<0.5	<0.2	<1
APR
16...	0.008	0.024	<0.04	0.8	<0.08	1.2	E.3	<0.2	<1
JUN
12...	0.013	0.041	<0.04	0.8	<0.08	15.7	<0.5	<0.2	<1
JUL
15...	0.010	0.020	<0.04	0.9	<0.08	1.6	<0.5	<0.2	M
AUG
18...	0.010	0.021	<0.04	0.8	<0.08	0.9	<0.5	<0.2	M
28...	0.009	0.020	<0.04	0.8	<0.08	0.8	E.3	<0.2	M
< -- Actual value is known to be less than the value shown. E -- Estimated laboratory analysis value. M -- Presence of material verified but not quantified.