City of Boulder/USGS Water Quality Monitoring
Water Quality Index for March, 2007 at
Boulder Creek at Orodell

Grade A For March, 2007 the WQI rating at Boulder Creek at Orodell (BC-ORO) was Excellent (A) due to a WQI value of 90.97. 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 95.70 97.21 0.17 16.53
Fecal Coliform #/100 mL Data Unavailable
pH pH 7.05 88.20 0.11 9.70
Total Phosphate mg PO4/L 0.02 98.23 0.10 9.82
Nitrates mg NO3/L Data Unavailable
Turbidity NTU 6.73 81.48 0.08 6.52
Total Solids mg/l 117.00 80.65 0.07 5.65
Totals (factors, total) 0.53 48.21
Adjusted WQI 90.97

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 February at this station

WQI for April at this station

Return to WQI map for March


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Last Page Update - Tuesday June 12, 2007