BASIN: Water Quality Index for March, 2006 at Boulder Creek Below Coal Creek


	City of Boulder/USGS Water Quality Monitoring
	Water Quality Index for March, 2006 at Boulder Creek Below Coal Creek

Grade D For March, 2006 the WQI rating at Boulder Creek Below Coal Creek (BC-bCC) was Bad (D) due to a WQI value of 30.94. 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	12.09	5.19	0.17	0.88
Fecal Coliform	#/100 mL	230.00	32.12	0.16	5.14
pH	pH	8.83	55.57	0.11	6.11
Total Phosphate	mg PO4/L	1.84	25.00	0.10	2.50
Nitrates	mg NO3/L	Data Unavailable
Turbidity	NTU	14.20	66.39	0.08	5.31
Total Solids	mg/l	550.00	20.00	0.07	1.40
Totals (factors, total)				0.69	21.35
Adjusted WQI					30.94

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 Coal Creek

WQI at Downstream Station: Middle Boulder Creek @ Nederland WTP

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!