City of Boulder/USGS Water Quality Monitoring
Water Quality Index for December, 2006 at
Boulder Creek Below Coal Creek

Grade C For December, 2006 the WQI rating at Boulder Creek Below Coal Creek (BC-bCC) was Medium (C) due to a WQI value of 57.08. 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 96.80 97.86 0.17 16.64
Fecal Coliform #/100 mL 1800.00 15.74 0.16 2.52
pH pH 8.13 82.62 0.11 9.09
Total Phosphate mg PO4/L 1.35 30.00 0.10 3.00
Nitrates mg NO3/L Data Unavailable
Turbidity NTU 18.50 61.15 0.08 4.89
Total Solids mg/l 387.00 46.45 0.07 3.25
Totals (factors, total) 0.69 39.39
Adjusted WQI 57.08

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: Boulder Creek Above Coal Creek

WQI at Downstream Station: Middle Boulder Creek @ Nederland WTP

WQI for November at this station

Return to WQI map for December


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