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

Grade A For September, 2006 the WQI rating at Middle Boulder Creek Above North Boulder Creek Confluence (BC-aNBC) was Excellent (A) due to a WQI value of 93.16. 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 93.10 95.92 0.17 16.31
Fecal Coliform #/100 mL Data Unavailable
pH pH 7.08 89.02 0.11 9.79
Total Phosphate mg PO4/L 0.03 98.23 0.10 9.82
Nitrates mg NO3/L Data Unavailable
Turbidity NTU 1.64 92.95 0.08 7.44
Total Solids mg/l 42.00 85.97 0.07 6.02
Totals (factors, total) 0.53 49.37
Adjusted WQI 93.16

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 August at this station

WQI for October at this station

Return to WQI map for September


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Last Page Update - Thursday March 01, 2007