The lake reaches a maximum depth of approximately 35 feet.
The park's namesake lake is situated within a glacial depression formed during the last ice age.
The park property was formerly part of a larger tract of land transitioned into county ownership for public recreational preservation.
Five Mile Lake Park is a 40-acre regional park featuring a 25-acre freshwater lake primarily used for swimming, fishing, and non-motorized boating. The park provides a designated sandy swimming beach and seasonal lifeguards during peak summer months. Visitors have access to a network of walking trails that traverse the surrounding second-growth forest. On-site facilities include picnic shelters, barbecue grills, and multiple play areas for children. The park is managed by King County and serves as a local hub for community outdoor gatherings. It features a boat launch specifically for hand-carried watercraft such as kayaks and canoes.
The small wooden pier extending into the lake, offering a panoramic view of the water with the tree-lined shore as a backdrop.
Arrive early on weekends during the summer, as the parking lot capacity is limited and fills quickly.
Bring water shoes for the swimming beach, as the lake bottom can be pebbly or muddy in certain areas.
Check King County Parks alerts before visiting for potential seasonal water quality notifications.
Attempting to launch motorized watercraft, as only hand-carried, non-motorized vessels are permitted on the lake.
Lifeguard services are limited to the summer season; swimming at other times is at the visitor's own risk.
Leash laws apply to all pets, and owners must pick up waste; swimming is restricted to the designated beach area only.
