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

WQI at Boulder Creek at 107th St for October, 2000

Grade C For October, 2000, the WQI rating at Boulder Creek at 107th St (BC-107) was Medium (C) due to a WQI value of 61.5. 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
BC-107 10/2000          
DO 124 % sat 88 0.17 14.96
Fecal Coliform 80 #/100 mL 47 0.16 7.52
pH 8.34 std units 70 0.11 7.7
Total Phosphate 0.987 mg/L PO4-P 41 0.10 4.1
Nitrates 29 mg/L NO3 28 0.10 2.8
Turbidity 2.1 NTU 90 0.08 7.2
totals (factors, total)       0.72 44.28
adjusted WQI         61.5

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 Upstream Station: Boulder Creek at 61st St.

WQI at Downstream Station: Boulder Creek Below Coal Creek

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