City of Boulder/USGS Water Quality Monitoring
Water Quality Index for May, 2005 at
North Boulder Creek diversion to Lakewood

Grade A For May, 2005 the WQI rating at North Boulder Creek diversion to Lakewood (NBC-Lw) was Excellent (A) due to a WQI value of 93.33. 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 94.32 96.73 0.17 16.44
Fecal Coliform #/100 mL Data Unavailable
pH pH 7.11 90.00 0.11 9.90
Total Phosphate mg PO4/L 0.02 98.23 0.10 9.82
Nitrates mg NO3/L 0.00 100.00 0.10 10.00
Turbidity NTU 3.86 87.21 0.08 6.98
Total Solids mg/l 4.80 80.81 0.07 5.66
Totals (factors, total) 0.63 58.80
Adjusted WQI 93.33

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 April at this station

WQI for June at this station

Return to WQI map for May


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Last Page Update - Saturday December 24, 2005