City of Boulder/USGS Water Quality Monitoring
Water Quality Index for March, 2006 at
Boulder Creek above Dry Creek

Grade C For March, 2006 the WQI rating at Boulder Creek above Dry Creek (BC-aDC) was Medium (C) due to a WQI value of 59.67. 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 118.40 91.86 0.17 15.62
Fecal Coliform #/100 mL 130.00 38.64 0.16 6.18
pH pH 8.09 84.92 0.11 9.34
Total Phosphate mg PO4/L 2.35 21.94 0.10 2.19
Nitrates mg NO3/L Data Unavailable
Turbidity NTU 19.40 60.33 0.08 4.83
Total Solids mg/l 412.00 43.06 0.07 3.01
Totals (factors, total) 0.69 41.17
Adjusted WQI 59.67

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: Boulder Creek above WW Plant

WQI at Downstream Station: Boulder Creek at 95th St

WQI for February at this station

WQI for April at this station

Return to WQI map for March


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Last Page Update - Thursday March 01, 2007