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

Grade B For March, 2006 the WQI rating at North Boulder Creek diversion to Lakewood (NBC-Lw) was Good (B) due to a WQI value of 86.67. 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 103.15 98.68 0.17 16.77
Fecal Coliform #/100 mL Data Unavailable
pH pH 7.32 92.95 0.11 10.22
Total Phosphate mg PO4/L 0.03 98.23 0.10 9.82
Nitrates mg NO3/L 0.03 98.54 0.10 9.85
Turbidity NTU 76.00 23.61 0.08 1.89
Total Solids mg/l 57.50 86.29 0.07 6.04
Totals (factors, total) 0.63 54.61
Adjusted WQI 86.67

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 February at this station

WQI for April at this station

Return to WQI map for March


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