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

Grade A For June, 2002 the WQI rating at North Boulder Creek diversion to Lakewood (NBC-Lw) was Excellent (A) due to a WQI value of 92.73. 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 102.37 98.84 0.17 16.80
Fecal Coliform #/100 mL 4.00 81.10 0.16 12.98
pH pH 7.62 93.28 0.11 10.26
Total Phosphate mg PO4/L 0.01 98.23 0.10 9.82
Nitrates mg NO3/L 0.00 100.00 0.10 10.00
Turbidity NTU 1.54 93.93 0.08 7.51
Total Solids mg/l 19.70 84.03 0.07 5.88
Totals (factors, total) 0.79 73.26
Adjusted WQI 92.73

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 May at this station

WQI for July at this station

Return to WQI map for June


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Last Page Update - Saturday December 24, 2005