Treasure Island (San Francisco Bay)

Treasure Island (San Francisco Bay)
Name	Treasure Island
Location	San Francisco Bay
Area sq mi	0.5
Country	United States
State	California
County	San Francisco
Population	(varies)

Treasure Island (San Francisco Bay) is a man-made island in San Francisco Bay connected by a causeway to Yerba Buena Island and linked to the San Francisco–Oakland Bay Bridge. Created for the Golden Gate International Exposition of 1939–1940, the island has served roles in World War II, United States Navy operations, and contemporary redevelopment initiatives. Its location near San Francisco places it amid regional transportation, environmental remediation, and urban planning issues involving agencies like the San Francisco Port Authority and United States Environmental Protection Agency.

History

Construction began in 1936 as part of preparations for the Golden Gate International Exposition, held on the site in 1939 and 1940 alongside exhibits promoting the Pacific Basin, Pan-Americanism, and advances in aviation exemplified by companies such as Lockheed Corporation and Douglas Aircraft Company. After the exposition, the island was transferred to the United States Navy in 1941 and converted into Naval Station Treasure Island to support the Navy's Pacific operations during World War II and the Korean War. Postwar, the island hosted naval training and housing, and later became a center for military housing, recruitment processing, and logistics during the Cold War era involving entities like the Department of Defense and Naval Facilities Engineering Command. Decommissioning in 1997 followed base closures under the BRAC process, after which control moved to local authorities, sparking redevelopment planning debates among the San Francisco Board of Supervisors, the Mayor of San Francisco, and regional planners. Public health concerns, including investigations by the Agency for Toxic Substances and Disease Registry and remediation overseen by the Environmental Protection Agency, have shaped later redevelopment efforts.

Geography and Environment

The island occupies a strategic position in San Francisco Bay near the Oakland International Airport, Alcatraz Island, and the Presidio of San Francisco. Built on landfill and dredged material, its geology includes fill over bay mud similar to conditions at Embarcadero (San Francisco) and portions of Mission Bay, San Francisco. The island's climate is governed by the Pacific Ocean and the California Current, producing Mediterranean conditions comparable to San Francisco and Oakland. Environmental concerns have centered on contamination from asbestos, lead, heavy metals, and petroleum related to former Navy facilities, triggering cleanup actions coordinated with the California Department of Toxic Substances Control and the San Francisco Department of Public Health. Coastal resiliency and sea-level rise adaptation plans tie the island to regional initiatives such as California Coastal Commission policies and the Bay Conservation and Development Commission's strategies.

Infrastructure and Development

Originally served by exposition-era buildings, the island later gained naval piers, hangars, and housing complexes modeled after contemporaneous military base architecture found at places like Naval Air Station North Island and Mare Island Naval Shipyard. Post-1997 redevelopment proposals have included mixed-use neighborhoods, transit connections to the Bay Bridge, and sustainability features endorsed by organizations such as the United States Green Building Council. Developers, municipal planners, and community groups have referenced zoning frameworks like San Francisco Planning Department regulations and state funding programs including the California Infrastructure and Economic Development Bank for upgrades. Transportation links include the I-80 (California) corridor via the Bay Bridge, planned ferry services similar to operations at San Francisco Ferry Building, and proposals for expanded bicycle and pedestrian access inspired by projects at Crissy Field and the Presidio Parkway.

Military and Naval Use

Under United States Navy control, the facility functioned as a major naval station supporting fleet training, staging, and housing, with facilities for aviation training akin to Naval Air Station Alameda and processing centers comparable to ones at Great Lakes Naval Training Center. During World War II, the island supported Pacific deployments, logistics, and personnel processed en route to Pearl Harbor and forward bases. The base hosted reserve units and collaborated with agencies such as the United States Coast Guard during peacetime operations. Cold War-era activities included communications, administration, and support roles that paralleled missions at installations like Camp Pendleton and Treasure Island Naval Station's counterparts on the West Coast. Closure under the BRAC system led to property transfer negotiations with federal, state, and municipal stakeholders.

Demographics and Community

Population levels have fluctuated from exposition visitors to wartime personnel, then to civilian residents following base closure. Housing stock has ranged from temporary barracks to family housing and recent mixed-use residential proposals drawing comparisons with redevelopment at Hunter's Point Shipyard and Pier 70 (San Francisco). Community groups, neighborhood associations, and advocacy organizations—including liaison with the San Francisco Housing Authority and Department of Veterans Affairs for veteran services—have influenced planning. Health and demographic studies conducted by the San Francisco Department of Public Health and academic partners from University of California, Berkeley and San Francisco State University have informed assessments of lead exposure, redevelopment impacts, and displacement risk.

Recreation and Attractions

Remaining landmarks include exposition-era structures, museum exhibits, and event spaces used for cultural programming similar to venues at Fort Mason and Palace of Fine Arts (San Francisco). Recreational amenities include waterfront promenades, proposed parks modeled after Crissy Field and Seacliff State Beach designs, and marina facilities comparable to those at South Beach (San Francisco). The island has hosted public events, film productions, and art installations, engaging institutions such as the San Francisco Arts Commission and the California Historical Society. Plans for tourism, hospitality, and open space aim to integrate with regional attractions like Fisherman's Wharf, Chinatown, San Francisco, and the Golden Gate Bridge corridor.

Category:Islands of San Francisco Bay