Andrews Bay - Seward Park

Seattle, Washington

Andrews Bay is connected to Seward Park, a beautiful peninsula with picnic areas, tennis courts, a swimming beach, art studio and environmental education center. Short term anchorage is approved in Andrews Bay. The approved area is defined by two buoys marked with "A" indicating the northwest and southwest corners of the anchorage zone. Shore markers note the northeast and southeast corners. Anchorage is limited ONLY to this area. A 72 hour maximum stay within any seven day period is permitted.

http://www.seattle.gov/parks/parkspaces/SewardPark/anchorage.htm

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
  • Passed water quality tests at least 95% of the time

  • Historical Status
  • This status is based on the latest sample, taken on September 21st, 2021. King County Department Natural Resources and Parks updates the status of this beach as soon as test results become available. These results were posted to Swim Guide on September 23th, 2021 at 8:23 PM.
For water quality icon legend, click:  
Current Weather
3°C
Cloudy
Monitoring Frequency

Andrews Bay - Seward Park is sampled weekly from May 15th to September 21st.

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

Andrews Bay - Seward Park

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
  • Passed water quality tests at least 95% of the time
  • Historical Status
  • This status is based on the latest sample, taken on September 21st, 2021. King County Department Natural Resources and Parks updates the status of this beach as soon as test results become available. These results were posted to Swim Guide on September 23th, 2021 at 8:23 PM.
For water quality icon legend, click:  
Current Weather
3°C
Cloudy

Andrews Bay is connected to Seward Park, a beautiful peninsula with picnic areas, tennis courts, a swimming beach, art studio and environmental education center. Short term anchorage is approved in Andrews Bay. The approved area is defined by two buoys marked with "A" indicating the northwest and southwest corners of the anchorage zone. Shore markers note the northeast and southeast corners. Anchorage is limited ONLY to this area. A 72 hour maximum stay within any seven day period is permitted.

http://www.seattle.gov/parks/parkspaces/SewardPark/anchorage.htm

Monitoring Frequency

Andrews Bay - Seward Park is sampled weekly from May 15th to September 21st.

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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