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

Grade A For January, 2006 the WQI rating at North Boulder Creek diversion to Lakewood (NBC-Lw) was Excellent (A) due to a WQI value of 93.42. 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 103.34 98.68 0.17 16.77
Fecal Coliform #/100 mL Data Unavailable
pH pH 7.22 91.64 0.11 10.08
Total Phosphate mg PO4/L 0.01 98.23 0.10 9.82
Nitrates mg NO3/L 0.04 98.54 0.10 9.85
Turbidity NTU 6.05 82.79 0.08 6.62
Total Solids mg/l 8.00 81.45 0.07 5.70
Totals (factors, total) 0.63 58.86
Adjusted WQI 93.42

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 February at this station

Return to WQI map for January


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Last Page Update - Thursday March 01, 2007