Lake Washington

Lake in Seattle, Washington, United States

About

What It Is

Lake Washington is a large freshwater lake situated adjacent to Seattle in King County, Washington, bordered by Seattle to the west, Bellevue and Kirkland to the east, Renton to the south, and Kenmore to the north ^[2]. It is the largest lake in King County and the second-largest natural lake in Washington State ^[2]^[3]. The lake's basin was carved by the Vashon glacial ice sheet into a deep, narrow trough with steeply sloping sides ^[3]. Its primary inflows are the Cedar River at the southern end and the Sammamish River at the northern end, while the Lake Washington Ship Canal, completed in 1916, serves as its sole outlet ^[2]^[3].

The lake encloses Mercer Island and sits 20.6 feet above mean lower tide in Puget Sound, to which it connects via Lake Union and the Ship Canal ^[3]. Its watershed is largely urban, with roughly 63 percent of the immediate surrounding area fully developed ^[3].

Activities & Experiences

Visitors can swim, stroll, and sunbathe at several lakeside parks along the shoreline, including Madison Park, Madrona Park, and the 300-acre Seward Park, where biking and hiking are also available ^[5]. Boating, kayaking, and stand-up paddleboarding are popular on the lake, with outfitters such as Seattle Paddle and Sail Sand Point offering boat and SUP rentals ^[5].

Sport fishing draws anglers to the lake, which supports sockeye, coho, and Chinook salmon, rainbow trout, largemouth and smallmouth bass, yellow perch, and black crappie ^[2]. Along the southeastern shore, Gene Coulon Memorial Beach Park in Renton offers swimming, boating, fishing, sports fields, playgrounds, picnic areas, and a lakeside boardwalk ^[1]. The Cedar River Trail, which connects to the lake, is suited to walking, biking, and jogging ^[1].

Practical Access

The lake is accessible from multiple cities along its perimeter, with numerous public parks providing shoreline entry points ^[1]^[5]. Three floating concrete bridges cross the lake — the SR 520 Evergreen Point Floating Bridge and the I-90 Lacey V. Murrow and Homer M. Hadley Memorial Bridges — providing road access from Seattle and the Eastside ^[2]. The 20-mile Burke-Gilman Trail allows visitors to reach the lake's north shore by foot, bicycle, or jogging from Puget Sound via Lake Union ^[5].

Two passenger seaplane bases serve the lake: Kenmore Air Harbor at the north end and the Will Rogers–Wiley Post Memorial Seaplane Base at the south end near Renton Municipal Airport ^[2]. No specific hours, fees, or reservation requirements are noted in the sources for general lake access.

Restrictions

No specific restrictions noted in the sources.

What Makes It Distinctive

Lake Washington is the second-largest natural lake in Washington State and the largest in King County, forming a defining geographic feature of the greater Seattle metropolitan area ^[2]^[3]. It is framed by the Cascade Range to the east and lined with parks offering a rare combination of urban accessibility and natural recreation ^[5]. The lake holds notable engineering history: the Lake Washington Ship Canal, opened in 1916, lowered the lake's water level by nine feet and redirected the Cedar River into it, fundamentally reshaping the regional hydrology ^[2]^[3]^[6].

The lake also carries deep historical significance — its name was proposed on July 4, 1854, by Thomas Mercer in honor of George Washington, the same year the Washington Territory was established ^[2]^[8]. Its waters hosted William Boeing's first airplane ride in a seaplane in 1915, an event linked to the founding of the Boeing Airplane Company ^[8].

Sources

Typical duration: 4h

Things to do

boating and kayaking
canoeing and paddleboard
photography
sailing
sport fishing (species: salmon, trout, bass, perch, crappie)
swimming (location: Gene Coulon Memorial Beach Park)
walking and biking (trail: Cedar River Trail)
watching sunsets
waterfront dining at nearby parks and marinas
wildlife watching

Amenities

lakeside boardwalk (location: Gene Coulon Memorial Beach Park)
picnic areas (locations: Cedar River Park, Gene Coulon Park, Kennydale Beach Park)
playgrounds and sports fields (location: Gene Coulon Memorial Beach Park)

Events & seasons

shore festivals (window: seasonal)

Features

indigenous name xachu; lake people xachua'bsh (language: Lushootseed)
largest lake, king county (rank: 2nd largest natural lake in Washington state)
longest floating bridge in the world (bridge: Evergreen Point Floating Bridge · length: 7,710 ft)
mercer island enclosed within lake
three floating bridges (longest: SR 520, 7,710 ft, world record)
two seaplane bases (north: Kenmore Air Harbor · south: Will Rogers–Wiley Post)