BASIN: Water Quality Index for March, 2006 at Boulder Creek at 107th St


	City of Boulder/USGS Water Quality Monitoring
	Water Quality Index for March, 2006 at Boulder Creek at 107th St

Grade C For March, 2006 the WQI rating at Boulder Creek at 107th St (BC-107) was Medium (C) due to a WQI value of 55.34. 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	138.80	79.20	0.17	13.46
Fecal Coliform	#/100 mL	70.00	45.96	0.16	7.35
pH	pH	8.46	70.49	0.11	7.75
Total Phosphate	mg PO4/L	2.74	19.84	0.10	1.98
Nitrates	mg NO3/L	Data Unavailable
Turbidity	NTU	14.90	65.41	0.08	5.23
Total Solids	mg/l	472.00	34.19	0.07	2.39
Totals (factors, total)				0.69	38.18
Adjusted WQI					55.34

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 at 95th St

WQI at Downstream Station: Boulder Creek Above Coal Creek

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!