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

Grade A For March, 2002 the WQI rating at North Boulder Creek diversion to Lakewood (NBC-Lw) was Excellent (A) due to a WQI value of 95.11. 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 95.26 96.89 0.17 16.47
Fecal Coliform #/100 mL 1.00 97.00 0.16 15.52
pH pH 7.30 92.95 0.11 10.22
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 2.36 91.31 0.08 7.30
Total Solids mg/l 25.90 84.84 0.07 5.94
Totals (factors, total) 0.79 75.14
Adjusted WQI 95.11

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

WQI for April at this station

Return to WQI map for March


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