City of Boulder/USGS Water Quality Monitoring
Water Quality Index for June, 2002 at
Middle Boulder Creek at PSCo Weir

Grade A For June, 2002 the WQI rating at Middle Boulder Creek at PSCo Weir (MBCaW) was Excellent (A) due to a WQI value of 95.48. 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 0.00 99.00 0.17 16.83
Fecal Coliform #/100 mL Data Unavailable
pH pH Data Unavailable
Total Phosphate mg PO4/L Data Unavailable
Nitrates mg NO3/L Data Unavailable
Turbidity NTU Data Unavailable
Total Solids mg/l 0.00 100.00 0.07 7.00
Parameter Unit Parameter Value Q-value Weight Factor Total
DO% % sat 99.52 98.35 0.17 16.72
Fecal Coliform #/100 mL 1.00 97.00 0.16 15.52
pH pH 7.65 92.95 0.11 10.22
Total Phosphate mg PO4/L 0.01 98.23 0.10 9.82
Nitrates mg NO3/L Data Unavailable
Turbidity NTU 0.63 96.72 0.08 7.74
Total Solids mg/l 18.60 83.71 0.07 5.86
Totals (factors, total) 0.69 65.88
Adjusted WQI 95.48

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 @ Nederland WTP

WQI at Downstream Station: Middle Boulder Creek Above North Boulder Creek Confluence

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