City of Boulder/USGS Water Quality Monitoring
Water Quality Index for July, 2006 at
Middle Boulder Creek at PSCo Weir

Grade A For July, 2006 the WQI rating at Middle Boulder Creek at PSCo Weir (MBCaW) was Excellent (A) due to a WQI value of 94.77. 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 105.08 98.51 0.17 16.75
Fecal Coliform #/100 mL Data Unavailable
pH pH 7.57 93.61 0.11 10.30
Total Phosphate mg PO4/L 0.00 100.00 0.10 10.00
Nitrates mg NO3/L Data Unavailable
Turbidity NTU 1.28 94.92 0.08 7.59
Total Solids mg/l 1.30 79.84 0.07 5.59
Totals (factors, total) 0.53 50.23
Adjusted WQI 94.77

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 June at this station

WQI for August at this station

Return to WQI map for July


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Last Page Update - Thursday March 01, 2007