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

WQI at Boulder Creek at 30th St. for October, 2000

Grade B For October, 2000, the WQI rating at Boulder Creek at 30th St. (BC-30) was Good (B) due to a WQI value of 78.9. 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-30 10/2000          
DO 109 % sat 96 0.17 16.32
Fecal Coliform 694 #/100 mL 24 0.16 3.84
pH 7.61 std units 94 0.11 10.34
Total Phosphate <0.01 mg/L PO4-P 98 0.10 9.8
Nitrates 1.43 mg/L NO3 93 0.10 9.3
Turbidity 2.76 NTU 90 0.08 7.2
totals (factors, total)       0.72 56.8
adjusted WQI         78.9

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 Eben G. Fine Park

WQI at Downstream Station: Boulder Creek at 61st St.

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