BASIN: Water Quality Index for July, 2006 at Middle Boulder Creek Above North Boulder Creek Confluence


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

Grade B For July, 2006 the WQI rating at Middle Boulder Creek Above North Boulder Creek Confluence (BC-aNBC) was Good (B) due to a WQI value of 89.91. 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	93.40	95.92	0.17	16.31
Fecal Coliform	#/100 mL	Data Unavailable
pH	pH	6.61	73.28	0.11	8.06
Total Phosphate	mg PO4/L	0.02	98.23	0.10	9.82
Nitrates	mg NO3/L	Data Unavailable
Turbidity	NTU	1.70	92.95	0.08	7.44
Total Solids	mg/l	60.00	86.13	0.07	6.03
Totals (factors, total)				0.53	47.65
Adjusted WQI					89.91

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: Middle Boulder Creek at PSCo Weir

WQI at Downstream Station: North Boulder Creek diversion to Lakewood

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!