Lake Sammamish State Park Beach

Issaquah, Washington

Lake Sammamish State Park is a 512-acre day-use park with 6,858-feet of waterfront on Lake Sammamish. The area around the lake was an important culture zone for local Native American tribes for centuries. The park provides deciduous forest and wetland vegetation for the enjoyment of visitors. A salmon-bearing creek and a great-blue-heron rookery are additional features.

Additional Information

- The park offers easy hiking trails, plus bicycling, and mountain biking through natural areas along paved and compacted dirt roads.
- Kayak rentals are available in the summer.
- There are sanded volleyball courts, but many people place volleyball nets anywhere on the beach.
- There are two bath houses with dressing rooms and two big toy children's play areas.
- There are two baseball fields.
- A recreational license is required for fishing and shellfish harvesting at Washington state parks. For regulations, fishing season information, or to purchase a recreational license, visit the Washington Department of Fish and Wildlife.

COVID-19

Keep your distance from other people.

Practicing social distancing is essential right now. Follow the advice of the health experts. If your community has asked that you remain indoors and away from others, do so. Heading to the beach should only be considered an option if social distancing practices can be followed. Spending a day in any crowded place is the worst thing we can do for our most vulnerable right now and will counter the efforts to curb the virus’ spread.

For more information, please visit the World Health Organization public resource on COVID-19.

Water Quality
  • Meets water quality standards

  • Current Status
  • This status is based on the latest sample, taken on May 26th, 2020. 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 May 28th, 2020 at 6:43 PM.
For water quality icon legend, click:  
Current Weather
10°C
Mostly clear
Monitoring Frequency

Lake Sammamish State Park Beach is sampled weekly from May 15th from 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 Mondays. Results are generally posted to the King County Swimming Beach Bacteria Monitoring page by noon on Wednesday.

During the sampling period, Puget Soundkeeper Alliance regularly updates the Swim Guide to reflect the most current information. 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. 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. 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. For more information go to King County Swimming Beach Bacteria Monitoring website: kingcounty.gov/swimbeach.

Water Quality Graph

Lake Sammamish State Park Beach

Issaquah, Washington

COVID-19

Keep your distance from other people.

Practicing social distancing is essential right now. Follow the advice of the health experts. If your community has asked that you remain indoors and away from others, do so. Heading to the beach should only be considered an option if social distancing practices can be followed. Spending a day in any crowded place is the worst thing we can do for our most vulnerable right now and will counter the efforts to curb the virus’ spread.

For more information, please visit the World Health Organization public resource on COVID-19.

Water Quality
  • Meets water quality standards
  • Current Status
  • This status is based on the latest sample, taken on May 26th, 2020. 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 May 28th, 2020 at 6:43 PM.
For water quality icon legend, click:  
Current Weather
10°C
Mostly clear

Lake Sammamish State Park is a 512-acre day-use park with 6,858-feet of waterfront on Lake Sammamish. The area around the lake was an important culture zone for local Native American tribes for centuries. The park provides deciduous forest and wetland vegetation for the enjoyment of visitors. A salmon-bearing creek and a great-blue-heron rookery are additional features.

Additional Information

- The park offers easy hiking trails, plus bicycling, and mountain biking through natural areas along paved and compacted dirt roads.
- Kayak rentals are available in the summer.
- There are sanded volleyball courts, but many people place volleyball nets anywhere on the beach.
- There are two bath houses with dressing rooms and two big toy children's play areas.
- There are two baseball fields.
- A recreational license is required for fishing and shellfish harvesting at Washington state parks. For regulations, fishing season information, or to purchase a recreational license, visit the Washington Department of Fish and Wildlife.

Monitoring Frequency

Lake Sammamish State Park Beach is sampled weekly from May 15th from 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 Mondays. Results are generally posted to the King County Swimming Beach Bacteria Monitoring page by noon on Wednesday.

During the sampling period, Puget Soundkeeper Alliance regularly updates the Swim Guide to reflect the most current information. 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. 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. 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. For more information go to King County Swimming Beach Bacteria Monitoring website: kingcounty.gov/swimbeach.

Water Quality Graph

  Beach Location Water Quality
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