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

Grade A For August, 2006 the WQI rating at Middle Boulder Creek Above North Boulder Creek Confluence (BC-aNBC) was Excellent (A) due to a WQI value of 94.06. 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 90.90 94.46 0.17 16.06
Fecal Coliform #/100 mL Data Unavailable
pH pH 7.35 93.28 0.11 10.26
Total Phosphate mg PO4/L 0.03 98.23 0.10 9.82
Nitrates mg NO3/L Data Unavailable
Turbidity NTU 0.80 95.74 0.08 7.66
Total Solids mg/l 53.00 86.45 0.07 6.05
Totals (factors, total) 0.53 49.85
Adjusted WQI 94.06

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 July at this station

WQI for September at this station

Return to WQI map for August


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Last Page Update - Thursday March 01, 2007