Swimming Beach Bacteria and Temperature Data, King County, Washington

Magnuson Beach Off Leash Area

Tabular Data
Charts

Sample Date	Fecal Coliform	Temperature (C)	Temperature (F)
9/22/2009	670	22.0	72.0
9/17/2009	719	21.0	70.0
9/8/2009	900	22.0	72.0
8/31/2009	36	23.0	73.0
8/18/2009	2	23.0	73.0
8/11/2009	160	22.0	72.0
8/4/2009	1	24.0	75.0
7/28/2009	20	24.0	75.0
7/21/2009	24	22.0	72.0
7/9/2009	45	20.0	68.0
7/1/2009	43	20.0	68.0
6/23/2009	180	19.0	66.0
6/15/2009	20	21.0	70.0
6/9/2009	500	21.0	70.0
6/2/2009	43	20.0	68.0
5/26/2009	41	14.0	57.0
5/18/2009	7	16.0	61.0
5/12/2009	13	12.0	54.0

Fecal Coliform Geometric Mean
126
94
25
12
11
20
16
44
44
81
80
79
42
38
-99
-99
-99
-99

Table Legend

Cell Color	Fecal Coliform Value	Concern Level
	Individual value < 200 CFU/100 ml	Low Concern
	Individual value > 200 & < 1000 CFU/100 ml	Moderate Concern
	Individual value > 1000 CFU/100 ml or geometric mean > 200 CFU/100 ml	High Concern

Magnuson off-leash area is not a swimming beach and has no lifeguard on duty. The bacteria counts at this location are low, but there have been several reports of swimmer's itch at this location. The Seattle Parks Department has posted a warning at this location due to reports of swimmer's itch. Information on swimmer's itch is available in the site inks section of this web page.
Seattle Parks Department