City of Boulder/USGS Water Quality Monitoring
Water Quality Index for April, 2006 at
Boulder Creek at Eben G. Fine Park

Grade A For April, 2006 the WQI rating at Boulder Creek at Eben G. Fine Park (BC-CAN) was Excellent (A) due to a WQI value of 91.80. 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 101.10 98.68 0.17 16.77
Fecal Coliform #/100 mL Data Unavailable
pH pH 7.45 93.77 0.11 10.31
Total Phosphate mg PO4/L 0.06 97.26 0.10 9.73
Nitrates mg NO3/L Data Unavailable
Turbidity NTU 10.80 72.62 0.08 5.81
Total Solids mg/l 44.00 86.13 0.07 6.03
Totals (factors, total) 0.53 48.65
Adjusted WQI 91.80

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 at Orodell

WQI at Downstream Station: Boulder Creek at 61st St.

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 - Thursday March 01, 2007