City of Boulder/USGS Water Quality Monitoring
Water Quality Index for January, 2002 at
North Boulder Creek diversion to Lakewood

Grade A For January, 2002 the WQI rating at North Boulder Creek diversion to Lakewood (NBC-Lw) was Excellent (A) due to a WQI value of 95.65. 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 99.03 98.35 0.17 16.72
Fecal Coliform #/100 mL 1.00 97.00 0.16 15.52
pH pH 7.77 91.97 0.11 10.12
Total Phosphate mg PO4/L 0.01 98.23 0.10 9.82
Nitrates mg NO3/L 0.06 98.54 0.10 9.85
Turbidity NTU 1.26 94.92 0.08 7.59
Total Solids mg/l 26.80 84.84 0.07 5.94
Totals (factors, total) 0.79 75.57
Adjusted WQI 95.65

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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