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

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

Grade C For June, 2000, the WQI rating at Boulder Creek at 107th St (BC-107) was Medium (C) due to a WQI value of 57.8. 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 6/2000          
DO 149.8 % sat 50 0.17 8.5
Fecal Coliform 130 #/100 mL 42 0.16 6.72
pH 8.56 std units 64 0.11 7.04
Total Phosphate 0.47 mg/L PO4-P 63 0.10 6.3
Nitrates 7.97 mg/L NO3 57 0.10 5.7
Turbidity 2.06 NTU 92 0.08 7.36
totals (factors, total)       0.72 41.62
adjusted WQI         57.8

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 October, 2000 at this station

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