BASIN: Water Quality Index for March, 2006 at North Boulder Creek at Boulder Falls


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

Grade A For March, 2006 the WQI rating at North Boulder Creek at Boulder Falls (NBC-FALLS) was Excellent (A) due to a WQI value of 91.57. 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	92.10	95.10	0.17	16.17
Fecal Coliform	#/100 mL	Data Unavailable
pH	pH	7.13	90.66	0.11	9.97
Total Phosphate	mg PO4/L	0.03	98.23	0.10	9.82
Nitrates	mg NO3/L	Data Unavailable
Turbidity	NTU	6.62	81.48	0.08	6.52
Total Solids	mg/l	55.00	86.45	0.07	6.05
Totals (factors, total)				0.53	48.53
Adjusted WQI					91.57

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 diversion to Lakewood

WQI at Downstream Station: Boulder Creek at Orodell

WQI for February at this station

WQI for April at this station

Return to WQI map for March

Thank You! BASIN was a community project which benefitted from over 1000 hours of public volunteer time. BASIN was highlighted by the US EPA in a national case study in its 2001 handbook Delivering Timely Environmental Information to Your Community. Thank you to all volunteers, and especially to the late Jim Waterman, BASIN Project Coordinator!