Treasure Island was originally intended to become a second airport for San Francisco, augmenting the existing San Francisco Municipal Airport, now SFO. Headquarters Building at US Naval Station Treasure Island The expo's Magic Carpet Great Lawn also remains.) Ī couplet from the song " Lydia the Tattooed Lady", in the Marx Brothers' 1939 film, At The Circus, reads "Here is Grover Whalen unveilin' the Trylon/Over on the West Coast we have Treasure Island", citing, in the Trylon and Treasure Island, two prominent features of international civic events happening that year (as the 1939 New York World's Fair vied for tourist patrons with the Golden Gate International Expo). In addition to Building 2 (Hangar 2) and Building 3 (Hangar 3), remaining exposition buildings include Building 1 ( Streamline Moderne architecture) intended after the expo as the Pan American World Airways terminal. On February 18, 1939, the 'Magic City' opened with a "walled city" of several fair ground courts: a central Court of Honor, a Court of the East, a Port of Trade Winds on the south and on the north: a Court of Pacifica, a 12,000-car parking lot, and the adjacent National Building, the $1.5M Federal Building, the Hall of Western States, the $800K administration building, various exhibit halls for industries (e.g., "Machinery, Science, and Vacationland"), and two 335-by-78-foot (102 m × 24 m) hangars planned for post-exposition use by Pan Am flying boats (e.g., the China Clipper through 1944 ) using the Port of Trade Winds Harbor later referred to as Clipper Cove between the two islands. Facility construction had begun by March 4, 1937, when two hangars were being built. Approximately 23 feet (7.0 m) of dredged bay sand filled the interior, was mitigated from salt, and then 50,000 cubic yards (38,000 m 3) topsoil was used for planting 4,000 trees, 70,000 shrubs, and 700,000 flowering plants. The 400-acre (1.6 km 2) island was constructed by emplacing 287,000 short tons (260,000 t) of quarried rock in the shoals for the island/causeway perimeter rock walls (a freshwater reservoir was quarried in the rock of Yerba Buena Island).
Prior to the island's construction by the United States government, "Yerba Buena Shoals" of rock north of the transbay island had less than 27 ft (8.2 m) clearance and were a shipping hazard. Raised walkways circumscribe nearly the entire island along five streets (Avenue of the Palms, Perimeter Road, Avenue N, Pan American World Airways Esplanade and Clipper Cove Way, formerly known as 1st Street). The island has a marina and a bikeway connecting to the newly completed Eastern span replacement of the San Francisco–Oakland Bay Bridge. Treasure Island is connected by a 900 ft (270 m) causeway to Yerba Buena Island, which in turn has on- and off-ramps to Interstate 80 on the San Francisco–Oakland Bay Bridge. Yerba Buena and Treasure islands together have a land area of 576.7 acres (233.4 ha) with – in 2010 – a total population of 2,500.
The San Francisco census tract that includes Treasure Island extends up and down the San Francisco Bay and includes a small uninhabited tip of western Alameda Island.
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