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

WQI at Boulder Creek Below Coal Creek for October, 2000

Grade C For October, 2000, the WQI rating at Boulder Creek Below Coal Creek (BC-bCC) was Medium (C) due to a WQI value of 62.1. 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-bCC 10/2000          
DO 111 % sat 96 0.17 16.32
Fecal Coliform 130 #/100 mL 42 0.16 6.72
pH 8.62 std units 60 0.11 6.6
Total Phosphate 0.782 mg/L PO4-P 48 0.10 4.8
Nitrates 18 mg/L NO3 40 0.10 4
Turbidity 9.2 NTU 78 0.08 6.24
totals (factors, total)       0.72 44.68
adjusted WQI         62.1

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 107th St

WQI at Downstream Station: Boulder Creek above St. Vrain

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