BASIN: Water Quality Index for June, 2006 at Boulder Creek above Dry Creek


	City of Boulder/USGS Water Quality Monitoring
	Water Quality Index for June, 2006 at Boulder Creek above Dry Creek

Grade C For June, 2006 the WQI rating at Boulder Creek above Dry Creek (BC-aDC) was Medium (C) due to a WQI value of 68.86. The chart below details the WQI calulations at this site. See the detailed explanation of the WQI method for more information.

Parameter	Unit	Parameter Value	Q-value	Weight Factor	Total
DO%	% sat	120.90	90.56	0.17	15.40
Fecal Coliform	#/100 mL	110.00	40.87	0.16	6.54
pH	pH	7.90	89.67	0.11	9.86
Total Phosphate	mg PO4/L	0.99	37.58	0.10	3.76
Nitrates	mg NO3/L	Data Unavailable
Turbidity	NTU	5.70	83.44	0.08	6.68
Total Solids	mg/l	160.00	75.48	0.07	5.28
Totals (factors, total)				0.69	47.52
Adjusted WQI					68.86

The WQI is computed by converting measured Water Quality Parameters to "Q-Values" using charts developed by the National Sanitation Foundation (NSF) water quality scientists. The Q-Values are then multiplied by a weighting factor based on the importance of that water quality parameter. These values are totaled and then divided by the sum of the weight factors.

WQI at Upstream Station: Boulder Creek above WW Plant

WQI at Downstream Station: Boulder Creek at 95th St

WQI for May at this station

WQI for July at this station

Return to WQI map for June

Thank You! BASIN was a community project which benefitted from over 1000 hours of public volunteer time. BASIN was highlighted by the US EPA in a national case study in its 2001 handbook Delivering Timely Environmental Information to Your Community. Thank you to all volunteers, and especially to the late Jim Waterman, BASIN Project Coordinator!