In 1775, Spanish explorer Perez Ayala was the first European to land on what would become Mare Island - he named it Isla de la Plana. This area was part of Rancho Suscol, deeded to General Mariano Guadalupe Vallejo in 1844. It became a waypoint for early settlers. In 1835, whilst traversing the Carquinez Strait, a crude ferry transporting men and livestock capsized in a squall. Among the livestock feared lost in the wreckage was the prized white mare of General Mariano Guadalupe Vallejo, the Mexican Commandante for Northern California. Several days later, General Vallejo's mare was found on the island, having swum ashore. Grateful for the fortunate turn of events, he renamed the island to Isla de la Yegua, Spanish for Mare Island, in her honor.

In 1850 United States Navy Commodore John Drake Sloat led a survey party in quest of a logical site for the nation's first Pacific naval installation. Sloat recommended the island across the Napa River from the settlement of Vallejo, as it was "free from ocean gales and from floods and freshets."

On November 6, 1850, two months after California was admitted to statehood, President Fillmore reserved Mare Island for government use. The Navy Department acted favorably on Commodore Sloat's recommendations and Mare Island was purchased for use as a naval shipyard in July 1852 at a cost of $83,410. On September 16, 1854, Mare Island became the first permanent U.S. naval installation on the west coast, with Commodore David Farragut, as Mare Island's first commander.

During World War II, 16 submarines, five submarine tenders, and 392 ships were built on Mare Island as well as over 4,000 damaged vessels repaired.  Mare Island was the largest naval repair facility in the world that employed over 48,000 people, 100,000 including sub-contractors.

20% of the work force were women, Marian the Machinist and Wendy the Welder.  300 buses went out in a radius of 75 miles, 6 times per day to pick up and drop off workers.  They came from every state of the union (save Vermont).

One shop worked 24/7 roasting coffee beans to send out on ships leaving Mare Island; another worked 24/7 making five gallon paint cans.

Mare Island provided housing for 13,000 in homes and another 5,000 in dormitories.  Over 42,000 meals were prepared every day in four cafeterias, eight booths and 15 electrically heated carts.  Nearly 80,000 flags per month were made in the flag loft.

Source:  Mare Island Historical Park Foundation

For over a century, Mare Island was the Navy's Mare Island Naval Shipyard. The growing size and number of the country's naval fleet was making older facilities obsolete and led to increased building and refitting of shipyards nationally. In 1872, the U.S. Public Works Department commenced construction of a 508-foot (155 m) drydock on the island, setting it on a foundation of cut granite blocks. The work was completed in 1891. A second drydock was begun in 1899, a concrete structure 740 feet (230 m) long set on wooden piles; it was completed in 1910. By 1941 a third drydock had been completed and drydock number four was under construction. The ammunition depot and submarine repair base were modern, fireproof buildings. A million dollar, three-way vehicle causeway to Vallejo replaced a ferry service.

Before World War II, Mare Island had been in a continual state of up-building. By 1941, new projects included improvements to the central power plant, a new pattern storage building, a large foundry, machine shop, magazine building, paint shop, new administration building, and a huge storehouse. The yard was expected to be able to repair and paint six to eight large naval vessels at a time. Several finger piers had recently been built, as well as a new shipbuilding wharf, adding one 500-foot (150 m) and a 750-foot (230 m) berth. It employed 5593 workers at the beginning of 1939, and rapidly increased to 18,500 by May 1941, with a monthly payroll of $3,500,000. In 1941, the drafting department had expanded to three buildings accommodating over 400 naval architects, engineers and draftsmen. The hospital had 584 beds.[2]

In 1969, the Navy transferred its (Vietnam War) Brown Water Navy Riverine Training Forces from Coronado, California to Mare Island. Swift Boats (Patrol Craft Fast-PCF), and PBRs (Patrol Boat River) conducted boat operations throughout the currently named Napa-Sonoma Marshes State Wildlife Area, on the north and west portions of Mare Island. Mare Island Naval Base was deactivated during the 1995 cycle of US base closures, but the U.S. Navy Reserves still have access to the water portions of the State Wildlife Area for any riverine warfare training being conducted from their new base in Sacramento, California.

In 1993 Congress approved the findings of the Base Realignment and Closure report, leading to the closure of Mare Island Naval Shipyard.  The shipyard had long been the economic engine of the city of Vallejo, having reached an employment peak of 40,000 workers during World War II, and even employing 10,000 workers after scaling back in 1988. When Congress ordered the base closure, the shipyard employed 5,800 workers.

The vision of rebuilding Mare Island as a vital place where people lived and worked was a key goal in the base conversion planning process undertaken by the city of Vallejo in the early 1990s. After the base was recommended for closure in 1993, the City undertook an extensive community-based reuse planning process, which resulted in a Final Reuse Plan that was approved by the Vallejo City Council in 1994. The Final Reuse Plan laid out the general vision for the Island’s redevelopment. The Reuse Plan was the basis for the Mare Island Specific Plan, which was approved in 1999 and amended in 2005 and 2007. The Mare Island Specific Plan designated land uses and established development standards for identified reuse areas and provided an implementation program to guide all subsequent planning activities.

Preservation of many of Mare Island’s 661 structures and other cultural resources was an additional factor in the planning process. As the oldest shipyard and naval facility on the West Coast, the shipyard earned a National Historic Landmark designation by the federal government in 1975. In 1979 California listed the entire naval base as a State Historical Landmark. In 1999 the city of Vallejo added Mare Island to the National Register of Historic Districts with 42 individual city landmarks.

Finally, as with any restoration of an industrial, brownfield landscape, both city and government agencies required environmental reviews, toxic substance removal, and soil remediation.

In 1998, Vallejo contracted with Lennar Mare Island LLC (LMI) to develop 650 acres of the eastern portion of Mare Island into a multi-use community. LMI contracted the Sausalito-based SWA Group to provide a Master Development Plan for Vallejo, additional historical research and landscape architectural services.

The Specific Plan included a variety of land uses, including a university district, and industrial zone, historic core, and residential neighborhoods. In addition, 78% of the island was set aside for wildlife habitat and wetlands, parkland and open space, and dredge ponds.[5] In 2007, LMI finished construction on the residential neighborhoods. Farragut Village, with 277 homes, was the first completed neighborhood. Additional neighborhoods include Coral Sea and Kirkland Isle II. Mare Island's Specific Plan calls for a total of1,400 homes and condos, plus 7,000,000 square feet (650,000 m2) of commercial, retail, entertainment, and industrial space.

Mare Island's residents petitioned LMI and the City of Vallejo to eliminate the dredge ponds, whose role had been to collect silt, drainage, and storm water from the Napa River and the Bay, and instead restore that acreage to wetlands. The city and the developer agreed, and in January 2006, the land use plan was amended to add the Mare Island Shoreline Heritage Preserve. An advisory board was appointed by the city to restore the 215-acre (0.87 km2) site into publicly accessible parkland.

Mare Island Dry Dock, LLC took over operations of Dry Dock 2 and Dry Dock 3 in 2013 and has steadily increased shipyard activity, acquiring contracts with government agencies including the United States Coast Guard, United States Navy, Department of Commerce and Military Sealift Command. (See also: Project Portfolio)