Cottonwood (Yankton) Lake at South Swimming Beach

Data updated on: 11/18/2004

Seasonal Geometric Mean	Geometric Mean for last 5 samples	Single Sample Maximum
1 Compare to 126	0 Compare to 126	220 Compare to 235

Date	E. coli (# per 100 ml)	Date	E. coli (# per 100 ml)
05/03/2004	No Data	07/19/2004	0
05/10/2004	8	07/26/2004	0
5/17/2004	20	08/02/2004	50
05/24/2004	0	08/09/2004	0
05/31/2004	90	08/16/2004	0
06/07/2004	0	08/23/2004	0
06/14/2004	0	08/30/2004	0
06/21/2004	0	09/06/2004	0
06/28/2004	0	09/13/2004	0
07/05/2004	220	09/20/2004	0
07/12/2004	40	09/27/2004	0

Note: Data flagged with * did not meet NDEQ's Quality Assurance Standards

For more information, contact
MoreInfo@NDEQ.state.NE.US

Nebraska Department of Environmental Quality
1200 "N" Street, Suite 400
P.O. Box 98922
Lincoln, Nebraska 68509
(402) 471-2186 FAX (402) 471-2909