Hours: 7:00 a.m. to Dusk

Gene Coulon Memorial Beach Park (originally Lake Washington Beach Park) consists of 57 acres of land and water at the southeast corner of Lake Washington. The park offers a unique opportunity for water-related recreational enjoyment. Animals, alcohol, rollerblades, skateboard, and bike touring are not allowed at Gene Coulon Memorial Beach Park. Bikes must yield to pedestrians and stay on the roadway. Enjoy Clam Lights, Kids Fishing Derbies, Annual 4th of July festivities, and the Kidd Valley Summer Concert Series at Coulon Beach Park. For additional information, call the Renton Community Center at 425-430-6700. View a map with picnic shelter locations and parking lots.

The swimming beach at Coulon Beach Park opens for the season in mid-June. Lifeguards will be on duty daily from 12:00 p.m. to 8:00 p.m. through Labor Day.

Amenities:

Eight boat-launch lanes (Credit and/or debit cards accepted only.)
Four picnic shelters (reservations required)
Playground equipment
Two tennis courts
Horseshoe pits
Two sand volleyball courts
Interpretive botanical walk
Fishing pier
IVARS and KIDD VALLEY food concessions
Water walk
Over 1.5 miles of paved walking trails along the shoreline
Access to the Lake Washington Loop Trail on Lake Washington Boulevard
ADA accessible

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
  • Meets water quality standards

  • Current Status
  • This status is based on the latest sample, taken on June 22nd, 2022. 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 June 23th, 2022 at 7:40 PM.
For water quality icon legend, click:  
Current Weather
22°C
Clear and sunny
Monitoring Frequency

Gene Coulon 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

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
  • Meets water quality standards
  • Current Status
  • This status is based on the latest sample, taken on June 22nd, 2022. 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 June 23th, 2022 at 7:40 PM.
For water quality icon legend, click:  
Current Weather
22°C
Clear and sunny

Hours: 7:00 a.m. to Dusk

Gene Coulon Memorial Beach Park (originally Lake Washington Beach Park) consists of 57 acres of land and water at the southeast corner of Lake Washington. The park offers a unique opportunity for water-related recreational enjoyment. Animals, alcohol, rollerblades, skateboard, and bike touring are not allowed at Gene Coulon Memorial Beach Park. Bikes must yield to pedestrians and stay on the roadway. Enjoy Clam Lights, Kids Fishing Derbies, Annual 4th of July festivities, and the Kidd Valley Summer Concert Series at Coulon Beach Park. For additional information, call the Renton Community Center at 425-430-6700. View a map with picnic shelter locations and parking lots.

The swimming beach at Coulon Beach Park opens for the season in mid-June. Lifeguards will be on duty daily from 12:00 p.m. to 8:00 p.m. through Labor Day.

Amenities:

Eight boat-launch lanes (Credit and/or debit cards accepted only.)
Four picnic shelters (reservations required)
Playground equipment
Two tennis courts
Horseshoe pits
Two sand volleyball courts
Interpretive botanical walk
Fishing pier
IVARS and KIDD VALLEY food concessions
Water walk
Over 1.5 miles of paved walking trails along the shoreline
Access to the Lake Washington Loop Trail on Lake Washington Boulevard
ADA accessible

Monitoring Frequency

Gene Coulon 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

  Beach Location Water Quality
Renton, Washington
Seattle, Washington
Mercer Island, Washington
Newcastle, Washington
Swim Guide
is supported by
* The RBC Foundation

Swim Guide shares the best information we have at the moment you ask for it. Always obey signs at the beach or advisories from official government agencies. Stay alert and check for other swimming hazards such as dangerous currents and tides. Please report your pollution concerns so Affiliates can help keep other beach-goers safe.

Swim Guide, "Swim Drink Fish icons," and associated trademarks are owned by SWIM DRINK FISH CANADA. See Legal.

© SWIM DRINK FISH CANADA, 2011 - 2022