BASIN: Water Quality Index for July, 2006 at North Boulder Creek at Boulder Falls


	City of Boulder/USGS Water Quality Monitoring
	Water Quality Index for July, 2006 at North Boulder Creek at Boulder Falls

Grade A For July, 2006 the WQI rating at North Boulder Creek at Boulder Falls (NBC-FALLS) was Excellent (A) due to a WQI value of 91.22. 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	95.10	96.89	0.17	16.47
Fecal Coliform	#/100 mL	Data Unavailable
pH	pH	6.99	86.39	0.11	9.50
Total Phosphate	mg PO4/L	0.08	95.32	0.10	9.53
Nitrates	mg NO3/L	Data Unavailable
Turbidity	NTU	3.16	89.51	0.08	7.16
Total Solids	mg/l	5.00	81.13	0.07	5.68
Totals (factors, total)				0.53	48.35
Adjusted WQI					91.22

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: North Boulder Creek diversion to Lakewood

WQI at Downstream Station: Boulder Creek at Orodell

WQI for June at this station

WQI for August at this station

Return to WQI map for July

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!