The park is located at the mouth of Thornton Creek, which is one of the largest watersheds within Seattle city limits.
It is a key segment of the Burke-Gilman Trail, which follows the former route of the Seattle, Lake Shore and Eastern Railway.
The park's swimming area is one of the few managed public beaches on Lake Washington that remains a focal point for the Lake City neighborhood.
During the summer, the park is monitored by lifeguards, a service not available at all Seattle public beaches.
The water quality of the swimming area is subject to regular testing by Public Health – Seattle & King County.
Matthews Beach Park is the largest freshwater swimming beach in Seattle, situated on the western shore of Lake Washington. The park features a sandy swimming area, a boat launch, and a designated bathhouse. It serves as a primary access point to the Burke-Gilman Trail, a major regional paved multi-use corridor. The grounds encompass roughly 22 acres of parkland and shoreline. A prominent drainage pipe outlet, often referred to as 'Thornton Creek,' flows into the lake at the southern edge of the beach. The site is maintained by Seattle Parks and Recreation. Amenities include picnic tables, open grassy fields, and modern restroom facilities. It is a popular location for local residents to launch non-motorized watercraft like kayaks and paddleboards. The swimming area is cordoned off from boat traffic for safety.
The wooden pier that extends into Lake Washington offers a clear view of the water with the park shoreline in the background.
Arrive early on hot summer weekends as the limited parking lot fills up quickly.
Bring water shoes if you prefer comfort, as the lake bottom near the shore can be rocky.
Utilize the bike racks provided near the trail entrance if you are cycling the Burke-Gilman.
Do not attempt to park on the narrow residential streets immediately surrounding the park, as towing is strictly enforced.
Lifeguard services are seasonal, typically operating only during the summer months.
Dogs must be leashed at all times and are strictly prohibited from the designated sandy swimming beach area.
