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

Grade A For March, 2002 the WQI rating at Middle Boulder Creek at PSCo Weir (MBCaW) was Excellent (A) due to a WQI value of 95.69. 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 97.93 97.86 0.17 16.64
Fecal Coliform #/100 mL 1.00 97.00 0.16 15.52
pH pH 7.64 93.28 0.11 10.26
Total Phosphate mg PO4/L 0.00 100.00 0.10 10.00
Nitrates mg NO3/L Data Unavailable
Turbidity NTU 1.06 94.92 0.08 7.59
Total Solids mg/l 43.00 85.97 0.07 6.02
Totals (factors, total) 0.69 66.03
Adjusted WQI 95.69

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 February at this station

WQI for April at this station

Return to WQI map for March


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Last Page Update - Saturday December 24, 2005