STILLWATER CREEK BASIN

THREE LAKES WATER-QUALITY STUDY-Continued

09018000 STILLWATER CREEK ABOVE LAKE GRANBY, NEAR GRAND LAKE, CO

WATER-QUALITY RECORDS

LOCATION.--Lat 40°11'17", long 105°53'40" (revised), in SE14SW14 sec.27, T.3 N., R.76 W., Grand County, Hydrologic Unit 1401001, approximately 0.25 mi upstream from high-water line of Lake Granby, 0.50 mi upstream from U.S. Highway 34, and 6 mi southwest of town of Grand Lake.

DRAINAGE AREA.--17.5 mi2.

PERIOD OF RECORD.--November 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=09018000

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)	Potas- sium, water, fltrd, mg/L (00935)	Sodium adsorp- tion ratio (00931)	Sodium, water, fltrd, mg/L (00930)	Chlor- ide, water, fltrd, mg/L (00940)
MAY
30...	0820	96	9.6	7.0	47	5.0	19	6.16	0.816	0.844	0.2	2.36	0.41
SEP
17...	0900	3.7	8.9	8.1	160	7.0	69	24.3	2.15	2.15	0.3	5.77	0.87

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

Date	Silica, water, fltrd, mg/L (00955)	Sulfate water, fltrd, mg/L (00945)	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, unfltrd mg/L (00665)	Organic carbon, water, fltrd, mg/L (00681)
MAY
30...	13.8	3.40	0.44	<0.015	<0.022	0.025	0.119	5.1
SEP
17...	23.9	5.82	0.20	<0.015	<0.022	0.052	0.095	3.4
< -- Actual value is known to be less than the value shown.