Kenmore Air Harbor Seaplane Base, or Seattle Lake Union Seaplane Base,[1][2] (IATA: LKE, FAA LID: W55) is a seaplane base and international airport on Lake Union, Washington, U.S., 1 nautical mile (1.9 km; 1.2 mi) north of Downtown Seattle.

[1] Kenmore Air Harbor Seaplane Base is 3 acres (1.2 ha) at an elevation of 14 feet (4.3 m) above mean sea level.

[3] For the 12 months ending December 31, 2022, the airport had 43,500 aircraft operations, an average of 119 per day: 82% air taxi and 18% general aviation.

In 2018, buoys and lights were installed in the lake to warn boaters of landing planes.

[4] Despite the warnings, recreational watergoers have continued to use the public lake, leading to cancelled flights.