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

WQI at Middle Boulder Creek at PSCo Weir for October, 2000

Grade A For October, 2000, the WQI rating at Middle Boulder Creek at PSCo Weir (MBCaW) was Excellent (A) due to a WQI value of 96.5. 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
MBCaW 10/2000          
DO 101 % sat 99 0.17 16.83
Fecal Coliform 0 #/100 mL 97 0.16 15.52
pH 7.74 std units 90 0.11 9.9
Total Phosphate 0.008 mg/L PO4-P 98 0.10 9.8
Nitrates 0.57 mg/L NO3 97 0.10 9.7
Turbidity 0.5 NTU 97 0.08 7.76
totals (factors, total)       0.72 69.51
adjusted WQI         96.5

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 above town of Eldora

WQI at Downstream Station: Middle Boulder Creek Above North Boulder Creek Confluence

WQI at for June, 2000 at this station

Return to WQI map for October, 2000
Thank You! BASIN was a community project which benefitted from over 1000 hours of public volunteer time. BASIN was highlighted by the US EPA in a national case study in its 2001 handbook Delivering Timely Environmental Information to Your Community. Thank you to all volunteers, and especially to the late Jim Waterman, BASIN Project Coordinator!
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Last Page Update - Tuesday December 27, 2005