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


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

Grade B For June, 2006 the WQI rating at Middle Boulder Creek Above North Boulder Creek Confluence (BC-aNBC) was Good (B) due to a WQI value of 81.48. 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	96.30	97.54	0.17	16.58
Fecal Coliform	#/100 mL	70.00	45.96	0.16	7.35
pH	pH	6.99	86.39	0.11	9.50
Total Phosphate	mg PO4/L	0.03	98.23	0.10	9.82
Nitrates	mg NO3/L	Data Unavailable
Turbidity	NTU	4.36	86.39	0.08	6.91
Total Solids	mg/l	52.00	86.45	0.07	6.05
Totals (factors, total)				0.69	56.22
Adjusted WQI					81.48

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 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!