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

Grade B For August, 2002 the WQI rating at Boulder Creek at Orodell (BC-ORO) was Good (B) due to a WQI value of 78.81. 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 115.60 93.81 0.17 15.95
Fecal Coliform #/100 mL 230.00 32.12 0.16 5.14
pH pH 7.00 87.21 0.11 9.59
Total Phosphate mg PO4/L 0.05 97.26 0.10 9.73
Nitrates mg NO3/L 0.10 97.90 0.10 9.79
Turbidity NTU Data Unavailable
Total Solids mg/l 102.00 82.26 0.07 5.76
Totals (factors, total) 0.71 55.95
Adjusted WQI 78.81

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 July at this station

WQI for September at this station

Return to WQI map for August


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