City of Boulder/USGS Water Quality Monitoring
Water Quality Index for April, 2005 at
Boulder Creek at Eben G. Fine Park

Grade B For April, 2005 the WQI rating at Boulder Creek at Eben G. Fine Park (BC-CAN) was Good (B) due to a WQI value of 89.30. 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 107.30 97.86 0.17 16.64
Fecal Coliform #/100 mL Data Unavailable
pH pH 7.88 89.67 0.11 9.86
Total Phosphate mg PO4/L 0.09 95.32 0.10 9.53
Nitrates mg NO3/L Data Unavailable
Turbidity NTU 8.80 76.56 0.08 6.12
Total Solids mg/l 175.00 73.87 0.07 5.17
Totals (factors, total) 0.53 47.33
Adjusted WQI 89.30

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 - Saturday December 24, 2005