City of Boulder/USGS Water Quality Monitoring
Water Quality Index for November, 2006 at
Boulder Creek at Orodell

Grade B For November, 2006 the WQI rating at Boulder Creek at Orodell (BC-ORO) was Good (B) due to a WQI value of 83.80. 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 93.00 95.92 0.17 16.31
Fecal Coliform #/100 mL 50.00 49.77 0.16 7.96
pH pH 6.87 82.46 0.11 9.07
Total Phosphate mg PO4/L 0.02 98.23 0.10 9.82
Nitrates mg NO3/L Data Unavailable
Turbidity NTU 0.89 95.74 0.08 7.66
Total Solids mg/l 0.00 100.00 0.07 7.00
Totals (factors, total) 0.69 57.82
Adjusted WQI 83.80

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: North Boulder Creek at Boulder Falls

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

WQI for October at this station

WQI for December at this station

Return to WQI map for November


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Last Page Update - Thursday March 01, 2007