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

WQI at Middle Boulder Creek Above North Boulder Creek Confluence for June, 2000

Grade B For June, 2000, the WQI rating at Middle Boulder Creek Above North Boulder Creek Confluence (BC-aNBC) was Good (B) due to a WQI value of 89.7. 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-aNBC 6/2000          
DO 108.1 % sat 97 0.17 16.49
Fecal Coliform <20 #/100 mL 70 0.16 11.2
pH 7.67 std units 92 0.11 10.12
Total Phosphate 0.03 mg/L PO4-P 98 0.10 9.8
Nitrates <0.3 mg/L NO3 98 0.10 9.8
Turbidity 2.45 NTU 90 0.08 7.2
totals (factors, total)       0.72 64.61
adjusted WQI         89.7

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: Middle Boulder Creek at PSCo Weir

WQI at Downstream Station: Boulder Creek at Eben G. Fine Park

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