GUNNISON RIVER BASIN

CURECANTI WATER-QUALITY NETWORK-Continued

383537107471500 RED ROCK CANYON AT MOUTH NEAR MONTROSE, CO

WATER-QUALITY RECORDS

LOCATION.--Lat 38°35'37", long 107°47'15", T.50 N., R.8 W., Gunnison County, Hydrologic Unit 14020002, 0.1 mi upstream of confluence with Gunnison River, and 9.3 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=383537107471500

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)
MAY
22...	1130	1.3	8.5	8.7	1,010	11.9	500	115	51.0	0.31	0.025	0.989	0.004
JUN
17...	0942	2.3	8.8	8.6	972	12.2	470	109	47.3	0.37	0.016	1.01	<0.002
JUL
16...	0840	2.5	8.2	8.5	946	14.2	460	105	48.1	0.24	0.016	0.995	E.002
AUG
07...	0820	3.0	7.7	8.5	888	14.4	460	108	45.0	0.32	0.019	0.896	<0.002
27...	0912	6.5	8.0	8.4	903	14.4	460	113	42.8	0.33	0.016	0.767	<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)
MAY
22...	0.037	0.054	<0.04	1.9	<0.08	1.1	46.1	<0.2	1
JUN
17...	0.055	0.082	<0.04	2.0	<0.08	0.8	50.1	<0.2	1
JUL
16...	0.030	0.044	<0.04	1.4	<0.08	1.0	48.9	<0.2	M
AUG
07...	0.051	0.078	<0.04	1.7	<0.08	1.1	50.9	<0.2	M
27...	0.028	0.065	<0.04	1.8	<0.08	1.4	38.9	<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.