City of Boulder/USGS Water Quality Monitoring
Water Quality Index for March, 2005 at
Boulder Creek at Orodell

Grade B For March, 2005 the WQI rating at Boulder Creek at Orodell (BC-ORO) was Good (B) due to a WQI value of 85.67. 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 100.10 98.51 0.17 16.75
Fecal Coliform #/100 mL 20.00 61.54 0.16 9.85
pH pH 7.91 88.85 0.11 9.77
Total Phosphate mg PO4/L 0.02 98.23 0.10 9.82
Nitrates mg NO3/L Data Unavailable
Turbidity NTU 3.40 88.69 0.08 7.10
Total Solids mg/l 92.00 83.23 0.07 5.83
Totals (factors, total) 0.69 59.11
Adjusted WQI 85.67

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: North Boulder Creek at Boulder Falls

WQI at Downstream Station: Boulder Creek at Eben G. Fine Park

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 - Saturday December 24, 2005