BASIN: Water Quality Index for March, 2006 at Boulder Creek at 95th St


	City of Boulder/USGS Water Quality Monitoring
	Water Quality Index for March, 2006 at Boulder Creek at 95th St

Grade C For March, 2006 the WQI rating at Boulder Creek at 95th St (BC-95) was Medium (C) due to a WQI value of 60.00. 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	85.10	89.42	0.17	15.20
Fecal Coliform	#/100 mL	80.00	44.37	0.16	7.10
pH	pH	7.95	88.20	0.11	9.70
Total Phosphate	mg PO4/L	2.75	19.84	0.10	1.98
Nitrates	mg NO3/L	Data Unavailable
Turbidity	NTU	17.80	61.80	0.08	4.94
Total Solids	mg/l	465.00	35.32	0.07	2.47
Totals (factors, total)				0.69	41.40
Adjusted WQI					60.00

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 Dry Creek

WQI at Downstream Station: Boulder Creek at 107th St

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!