City of Boulder/USGS Water Quality Monitoring
Water Quality Index for January, 2005 at
Boulder Creek Below Coal Creek

Grade C For January, 2005 the WQI rating at Boulder Creek Below Coal Creek (BC-bCC) was Medium (C) due to a WQI value of 55.59. 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 113.60 94.78 0.17 16.11
Fecal Coliform #/100 mL 170.00 35.78 0.16 5.72
pH pH 8.62 64.26 0.11 7.07
Total Phosphate mg PO4/L 1.47 28.55 0.10 2.85
Nitrates mg NO3/L Data Unavailable
Turbidity NTU 25.10 54.75 0.08 4.38
Total Solids mg/l 485.00 31.61 0.07 2.21
Totals (factors, total) 0.69 38.35
Adjusted WQI 55.59

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 February at this station

Return to WQI map for January


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Last Page Update - Saturday December 24, 2005