Magnuson Beach Off Leash Area

Seattle, Washington

Discover a great urban park which includes pieces of Seattle’s military past and eco-friendly future! Warren G. Magnuson Park sits on a splendid mile-long stretch of Lake Washington’s shoreline in northeast Seattle. At 350 acres, it is Seattle’s second largest park.

This former Navy airfield has transformed into a unique combination of features and activities for you to enjoy: recreation and leisure—boating, tennis, swimming, walks, kite flying, to name a few; sports fields; natural areas; and a historic campus.

COVID-19

Keep your distance from other people.

Practicing social distancing is still essential. Only go to the beach if you are able to keep 6 feet or 2 meters away from others. Follow the instructions provided by your local health authorities. If your community has asked that you remain indoors and away from others, do so. Spending a day in any crowded place is the worst thing we can do for our most vulnerable right now and will counter our efforts to curb the virus’s spread.

Water Quality
  • No data available

  • Current Status
  • This status is based on the latest sample. King County Department Natural Resources and Parks updates the status of this beach as soon as test results become available.
For water quality icon legend, click:  
Current Weather
8°C
Cloudy
Monitoring Frequency

Magnuson Beach Off Leash Area is not sampled

Source Information

The King County Department of Natural Resources and Parks monitors water quality at designated swimming beaches in the county from May to September. Water quality data is collected weekly, usually on Tuesdays. Results are generally posted to the King County Lake Swimming Beach Bacteria Monitoring page by noon on Wednesday.

Local health officials use the following protocol to make closure determinations – A day’s average E. coli value is over 1000 CFU/100 mL – OR - The average of the E. coli values for the three most recent sampling days is over 200 CFU/100 mL. The three-day average is calculated using the geometric mean (geomean). The unit of measure is a CFU which stands for Colony Forming Units.

The King County Water and Land Resources Division (WLRD) collects and analyzes the samples. Public Health Seattle & King County is alerted when bacteria or state algal toxin thresholds are exceeded and determines the health and safety implications of the bacteria and algal toxin data collected, and they work with King County WLRD and the local park manager to post an advisory.

A beach is marked Green (open) when both of these protocols are met.
A beach is marked Red (closed) when these criteria are not met and the public health officials have closed the beach.

A beach may also be marked Red if there is a Harmful Algal Bloom (HAB) reported at the beach. A beach is marked Grey when current water quality data is not available.


For more information go to King County Swimming Beach Bacteria Monitoring website: kingcounty.gov/swimbeach.

Read more
Water Quality Graph

Magnuson Beach Off Leash Area

Seattle, Washington

COVID-19

Keep your distance from other people.

Practicing social distancing is still essential. Only go to the beach if you are able to keep 6 feet or 2 meters away from others. Follow the instructions provided by your local health authorities. If your community has asked that you remain indoors and away from others, do so. Spending a day in any crowded place is the worst thing we can do for our most vulnerable right now and will counter our efforts to curb the virus’s spread.

Water Quality
  • No data available
  • Current Status
  • This status is based on the latest sample. King County Department Natural Resources and Parks updates the status of this beach as soon as test results become available.
For water quality icon legend, click:  
Current Weather
8°C
Cloudy

Discover a great urban park which includes pieces of Seattle’s military past and eco-friendly future! Warren G. Magnuson Park sits on a splendid mile-long stretch of Lake Washington’s shoreline in northeast Seattle. At 350 acres, it is Seattle’s second largest park.

This former Navy airfield has transformed into a unique combination of features and activities for you to enjoy: recreation and leisure—boating, tennis, swimming, walks, kite flying, to name a few; sports fields; natural areas; and a historic campus.

Monitoring Frequency

Magnuson Beach Off Leash Area is not sampled

Source Information

The King County Department of Natural Resources and Parks monitors water quality at designated swimming beaches in the county from May to September. Water quality data is collected weekly, usually on Tuesdays. Results are generally posted to the King County Lake Swimming Beach Bacteria Monitoring page by noon on Wednesday.

Local health officials use the following protocol to make closure determinations – A day’s average E. coli value is over 1000 CFU/100 mL – OR - The average of the E. coli values for the three most recent sampling days is over 200 CFU/100 mL. The three-day average is calculated using the geometric mean (geomean). The unit of measure is a CFU which stands for Colony Forming Units.

The King County Water and Land Resources Division (WLRD) collects and analyzes the samples. Public Health Seattle & King County is alerted when bacteria or state algal toxin thresholds are exceeded and determines the health and safety implications of the bacteria and algal toxin data collected, and they work with King County WLRD and the local park manager to post an advisory.

A beach is marked Green (open) when both of these protocols are met.
A beach is marked Red (closed) when these criteria are not met and the public health officials have closed the beach.

A beach may also be marked Red if there is a Harmful Algal Bloom (HAB) reported at the beach. A beach is marked Grey when current water quality data is not available.


For more information go to King County Swimming Beach Bacteria Monitoring website: kingcounty.gov/swimbeach.

Read more
Water Quality Graph

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