City of Boulder/USGS Water Quality Monitoring
Water Quality Index for December, 2006 at
North Boulder Creek diversion to Lakewood

Grade A For December, 2006 the WQI rating at North Boulder Creek diversion to Lakewood (NBC-Lw) was Excellent (A) due to a WQI value of 94.39. 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 102.53 98.84 0.17 16.80
Fecal Coliform #/100 mL Data Unavailable
pH pH 7.29 92.62 0.11 10.19
Total Phosphate mg PO4/L Data Unavailable
Nitrates mg NO3/L 0.03 98.54 0.10 9.85
Turbidity NTU 1.18 94.92 0.08 7.59
Total Solids mg/l 0.50 79.84 0.07 5.59
Totals (factors, total) 0.53 50.03
Adjusted WQI 94.39

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 Above North Boulder Creek Confluence

WQI at Downstream Station: North Boulder Creek at Boulder Falls

WQI for November at this station

Return to WQI map for December


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Last Page Update - Thursday March 01, 2007