City of Boulder/USGS Water Quality Monitoring
Boulder Creek Watershed
Boulder Creek Water Quality Index

WQI at Middle Boulder Creek above town of Eldora for October, 2000

Grade A For October, 2000, the WQI rating at Middle Boulder Creek above town of Eldora (MBC-ELDORA) was Excellent (A) due to a WQI value of 96.3. The chart below details the WQI calulations at this site. See the detailed explanation of the WQI method for more information.

6-parameter Test result unit Q-value weight factor total
MBC-ELDORA 10/2000          
DO 96.5 % sat 98 0.17 16.66
Fecal Coliform 1 #/100 mL 97 0.16 15.52
pH 7.72 std units 90 0.11 9.9
Total Phosphate <0.01 mg/L PO4-P 98 0.10 9.8
Nitrates 0.79 mg/L NO3 97 0.10 9.7
Turbidity 0.22 NTU 97 0.08 7.76
totals (factors, total)       0.72 69.34
adjusted WQI         96.3

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.

WQI at Downstream Station: Middle Boulder Creek at PSCo Weir

WQI at for June, 2000 at this station

Return to WQI map for October, 2000
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Last Page Update - Tuesday December 27, 2005