Swimming Beach Bacteria and Temperature Data, King County, Washington

Matthews Beach

Tabular Data
Charts

Sample Date	Fecal Coliform	Temperature (C)	Temperature (F)
9/22/2009	150	22.0	72.0
9/15/2009	14	21.0	70.0
9/8/2009	78	21.0	70.0
8/31/2009	9	23.0	73.0
8/25/2009	5	21.0	70.0
8/18/2009	16	23.0	73.0
8/11/2009	5	22.0	72.0
8/4/2009	12	24.0	75.0
7/28/2009	64	24.0	75.0
7/21/2009	24	21.0	70.0
7/14/2009	11	20.0	68.0
7/7/2009	260	19.0	66.0
6/29/2009	5	19.0	66.0
6/23/2009	100	21.0	70.0
6/15/2009	5	21.0	70.0
6/9/2009	37	21.0	70.0
6/2/2009	10	20.0	68.0
5/26/2009	62	15.0	59.0
5/18/2009	4	16.0	61.0
5/12/2009	3	12.0	54.0

Fecal Coliform Geometric Mean
24
15
12
8
13
17
16
35
29
32
23
30
16
26
14
12
-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

In 1958, King County voters created an agency (Metro) to provide wastewater treatment and clean the waters of Lake Washington and Elliot Bay. Matthews Park Pump Station, constructed in 1967, is part of the original conveyance and treatment system that helped to clean up Lake Washington. Although Matthews Park Pump Station is located near Matthews Beach Park, it does not impact water quality under normal operating conditions.
Matthews Beach closure information
Due to high bacteria counts, do not wade in Thornton Creek
Learn more about the pump station

Seattle Parks Department