City of Boulder/USGS Water Quality Monitoring
Water Quality Index for June, 2006 at
North Boulder Creek at Boulder Falls

Grade B For June, 2006 the WQI rating at North Boulder Creek at Boulder Falls (NBC-FALLS) was Good (B) due to a WQI value of 79.60. 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%(*calculated) % sat 107.77 97.70 0.17 16.61
Fecal Coliform #/100 mL 40.00 52.48 0.16 8.40
pH pH 6.45 65.74 0.11 7.23
Total Phosphate mg PO4/L 0.05 97.26 0.10 9.73
Nitrates mg NO3/L Data Unavailable
Turbidity NTU 4.25 86.39 0.08 6.91
Total Solids mg/l 53.00 86.45 0.07 6.05
Totals (factors, total) 0.69 54.93
Adjusted WQI 79.60

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.


Calculation of Dissolved Oxygen as Percentage of Saturation
(computed when measured DO% is unavailable)
Saturation DO at sea level and measured temperature (10.10 ° C) = 11.24 mg/L
Saturation DO corrected for station elevation (6880.00 ft. a.s.l) = 8.54 mg/L
Actual dissolved oxygen measured at station = 9.20 mg/L
Measured dissolved oxygen as percent of saturation = 107.77 %

WQI at Upstream Station: North Boulder Creek diversion to Lakewood

WQI at Downstream Station: Boulder Creek at Orodell

WQI for May at this station

WQI for July at this station

Return to WQI map for June


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Last Page Update - Thursday March 01, 2007