City of Boulder/USGS Water Quality Monitoring
Water Quality Index for May, 2006 at
North Boulder Creek diversion to Lakewood

Grade A For May, 2006 the WQI rating at North Boulder Creek diversion to Lakewood (NBC-Lw) was Excellent (A) due to a WQI value of 94.30. The chart below details the WQI calulations at this site. See the detailed explanation of the WQI method for more information.


Parameter Unit Parameter Value Q-value Weight Factor Total
DO% % sat 95.00 96.89 0.17 16.47
Fecal Coliform #/100 mL Data Unavailable
pH pH 7.67 92.95 0.11 10.22
Total Phosphate mg PO4/L 0.01 98.23 0.10 9.82
Nitrates mg NO3/L 0.00 100.00 0.10 10.00
Turbidity NTU 2.41 91.31 0.08 7.30
Total Solids mg/l 1.30 79.84 0.07 5.59
Totals (factors, total) 0.63 59.41
Adjusted WQI 94.30

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. These values are totaled and then divided by the sum of the weight factors.

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

WQI at Downstream Station: North Boulder Creek at Boulder Falls

WQI for April at this station

WQI for June at this station

Return to WQI map for May


INVITATION: BASIN is a community project actively seeking public participation. We appreciate all feedback and welcome comments, suggestions and contributions. To find out more about how you can be involved, click here.

Home | Site Map | Glossary | Bibliography | Contributors
About BASIN | Attribution | Feedback | Search
Last Page Update - Thursday March 01, 2007