ARKANSAS RIVER BASIN

07099200 ARKANSAS RIVER NEAR PORTLAND, CO

WATER-QUALITY RECORDS

LOCATION.--Lat 38°20'14", long 104°56'18", in NW14SW14 sec.6, T.20 S., R.67 W., Fremont County, Hydrologic Unit 11020002, on left bank at Hobson Ranch, 1.4 mi downstream from Willow Creek, and 5.4 mi southeast of Portland.

DRAINAGE AREA.--4,280 mi2.

PERIOD OF RECORD.--October 1964 to September 1979, May to August 1987, March 1999 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=07099200

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)	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)	Ortho- phos- phate, water, fltrd, mg/L as P (00671)	Phos- phorus, water, fltrd, mg/L (00666)	Phos- phorus, water, unfltrd mg/L (00665)	Organic carbon, water, fltrd, mg/L (00681)
APR
23...	1100	168	11.5	8.6	644	12.5	E.014	0.215	0.007	0.050	0.061	0.093	2.7
JUN
18...	1120	e1800	8.5	7.9	204	17.0	<0.015	0.138	<0.002	0.009	0.015	0.072	2.1
JUL
31...	1040	618	7.3	7.9	337	21.0	0.051	0.331	0.008	0.051	0.063	0.33	2.5
AUG
26...	0845	358	7.4	8.1	452	19.0	0.042	0.313	0.007	0.053	0.065	0.34	2.6
SEP
29...	1130	230	10.0	8.4	559	15.0	<0.015	0.037	E.002	0.039	0.051	0.072	2.6
< -- Actual value is known to be less than the value shown. E -- Estimated laboratory analysis value e -- Estimated..