City of Boulder/USGS Water Quality Monitoring
Water Quality Index for March, 2005 at
Boulder Creek Below Coal Creek

Grade C For March, 2005 the WQI rating at Boulder Creek Below Coal Creek (BC-bCC) was Medium (C) due to a WQI value of 56.19. 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 126.70 86.83 0.17 14.76
Fecal Coliform #/100 mL 40.00 52.48 0.16 8.40
pH pH 8.82 55.57 0.11 6.11
Total Phosphate mg PO4/L 1.51 27.90 0.10 2.79
Nitrates mg NO3/L Data Unavailable
Turbidity NTU 14.20 66.39 0.08 5.31
Total Solids mg/l 561.00 20.00 0.07 1.40
Totals (factors, total) 0.69 38.77
Adjusted WQI 56.19

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: Boulder Creek Above Coal Creek

WQI at Downstream Station: Middle Boulder Creek @ Nederland WTP

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