City of Boulder/USGS Water Quality Monitoring
Water Quality Index for April, 2005 at
Middle Boulder Creek at PSCo Weir

Grade A For April, 2005 the WQI rating at Middle Boulder Creek at PSCo Weir (MBCaW) was Excellent (A) due to a WQI value of 94.16. 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 103.86 98.68 0.17 16.77
Fecal Coliform #/100 mL Data Unavailable
pH pH 7.38 93.44 0.11 10.28
Total Phosphate mg PO4/L 0.01 98.23 0.10 9.82
Nitrates mg NO3/L Data Unavailable
Turbidity NTU 2.01 92.13 0.08 7.37
Total Solids mg/l 4.00 80.81 0.07 5.66
Totals (factors, total) 0.53 49.90
Adjusted WQI 94.16

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 March at this station

WQI for May at this station

Return to WQI map for April


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Last Page Update - Saturday December 24, 2005