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 October, 2000

Grade B For October, 2000, the WQI rating at Middle Boulder Creek Above North Boulder Creek Confluence (BC-aNBC) was Good (B) due to a WQI value of 85.3. 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
BC-aNBC 10/2000          
DO 95.3 % sat 96 0.17 16.32
Fecal Coliform 50 #/100 mL 53 0.16 8.48
pH 7.93 std units 85 0.11 9.35
Total Phosphate 0.065 mg/L PO4-P 98 0.10 9.8
Nitrates 0.29 mg/L NO3 97 0.10 9.7
Turbidity 0.38 NTU 97 0.08 7.76
totals (factors, total)       0.72 61.41
adjusted WQI         85.3

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 Upstream Station: Middle Boulder Creek at PSCo Weir

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

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