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

WQI at Boulder Creek Below Coal Creek for June, 2000

Grade C For June, 2000, the WQI rating at Boulder Creek Below Coal Creek (BC-bCC) was Medium (C) due to a WQI value of 55.9. 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-bCC 6/2000          
DO 155.1 % sat 50 0.17 8.5
Fecal Coliform 110 #/100 mL 42 0.16 6.72
pH 9.03 std units 48 0.11 5.28
Total Phosphate 0.33 mg/L PO4-P 77 0.10 7.7
Nitrates 7.3 mg/L NO3 58 0.10 5.8
Turbidity 9.35 NTU 78 0.08 6.24
totals (factors, total)       0.72 40.24
adjusted WQI         55.9

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 107th St

WQI at Downstream Station: Boulder Creek above St. Vrain

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