City of Boulder/USGS Water Quality Monitoring
Water Quality Index for July, 2002 at
Boulder Creek at Orodell

Grade B For July, 2002 the WQI rating at Boulder Creek at Orodell (BC-ORO) was Good (B) due to a WQI value of 85.05. 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 130.60 84.72 0.17 14.40
Fecal Coliform #/100 mL 20.00 61.54 0.16 9.85
pH pH 7.30 92.95 0.11 10.22
Total Phosphate mg PO4/L 0.02 98.23 0.10 9.82
Nitrates mg NO3/L 0.10 97.90 0.10 9.79
Turbidity NTU 3.50 88.69 0.08 7.10
Total Solids mg/l 40.00 85.81 0.07 6.01
Totals (factors, total) 0.79 67.19
Adjusted WQI 85.05

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: North Boulder Creek at Boulder Falls

WQI at Downstream Station: Boulder Creek at Eben G. Fine Park

WQI for June at this station

WQI for August at this station

Return to WQI map for July


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Last Page Update - Saturday December 24, 2005