City of Boulder/USGS Water Quality Monitoring
Water Quality Index for April, 2007 at
Boulder Creek at Eben G. Fine Park

Grade B For April, 2007 the WQI rating at Boulder Creek at Eben G. Fine Park (BC-CAN) was Good (B) due to a WQI value of 83.09. 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 92.70 95.43 0.17 16.22
Fecal Coliform #/100 mL 20.00 61.54 0.16 9.85
pH pH 7.47 93.77 0.11 10.31
Total Phosphate mg PO4/L 0.04 97.26 0.10 9.73
Nitrates mg NO3/L Data Unavailable
Turbidity NTU 12.10 70.00 0.08 5.60
Total Solids mg/l 120.00 80.32 0.07 5.62
Totals (factors, total) 0.69 57.33
Adjusted WQI 83.09

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 - Tuesday June 12, 2007