City of Boulder/USGS Water Quality Monitoring
Water Quality Index for May, 2005 at
Boulder Creek at Orodell

Grade B For May, 2005 the WQI rating at Boulder Creek at Orodell (BC-ORO) was Good (B) due to a WQI value of 89.44. 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 100.70 98.68 0.17 16.77
Fecal Coliform #/100 mL Data Unavailable
pH pH 7.17 91.15 0.11 10.03
Total Phosphate mg PO4/L 0.04 97.26 0.10 9.73
Nitrates mg NO3/L Data Unavailable
Turbidity NTU 14.80 65.41 0.08 5.23
Total Solids mg/l 115.00 80.65 0.07 5.65
Totals (factors, total) 0.53 47.40
Adjusted WQI 89.44

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 April at this station

WQI for June at this station

Return to WQI map for May


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Last Page Update - Saturday December 24, 2005