Point Bonita Lighthouse is a

lighthouse A lighthouse is a tower, building, or other type of physical structure designed to emit light from a system of lamps and lenses and to serve as a beacon for navigational aid, for maritime pilots at sea or on inland waterways. Lighthouses mar ...

located at Point Bonita at the

San Francisco Bay San Francisco Bay is a large tidal estuary in the U.S. state of California, and gives its name to the San Francisco Bay Area. It is dominated by the big cities of San Francisco, San Jose, and Oakland. San Francisco Bay drains water from a ...

entrance in the

Marin Headlands The Marin Headlands is a hilly peninsula at the southernmost end of Marin County, California, United States, located just north of San Francisco across the Golden Gate Bridge, which connects the two counties and peninsulas. The entire area is pa ...

near

Sausalito, California Sausalito (Spanish language, Spanish for "small willow grove") is a city in Marin County, California, Marin County, California, United States, located southeast of Marin City, California, Marin City, south-southeast of San Rafael, California ...

. Point Bonita was the last manned lighthouse on the California coast. It was added to the

National Register of Historic Places The National Register of Historic Places (NRHP) is the United States federal government's official list of districts, sites, buildings, structures and objects deemed worthy of preservation for their historical significance or "great artistic v ...

in 1991.

History

More than 300 boats ran aground near the Golden Gate during the

California Gold Rush The California Gold Rush (1848–1855) was a gold rush that began on January 24, 1848, when gold was found by James W. Marshall at Sutter's Mill in Coloma, California. The news of gold brought approximately 300,000 people to California fro ...

years, requiring a lighthouse. The original Point Bonita Lighthouse, a brick tower, was built in 1855 at above sea level with a second order

Fresnel lens A Fresnel lens ( ; ; or ) is a type of composite compact lens developed by the French physicist Augustin-Jean Fresnel (1788–1827) for use in lighthouses. It has been called "the invention that saved a million ships." The design allows the c ...

. This was too high. Unlike the East Coast of the United States, the

West Coast West Coast or west coast may refer to: Geography Australia * Western Australia *Regions of South Australia#Weather forecasting, West Coast of South Australia * West Coast, Tasmania **West Coast Range, mountain range in the region Canada * Britis ...

has dense high

fog Fog is a visible aerosol consisting of tiny water droplets or ice crystals suspended in the air at or near the Earth's surface. Reprint from Fog can be considered a type of low-lying cloud usually resembling stratus, and is heavily influ ...

, which leaves lower elevations clear. Since the original light was so high, it was often cloaked in

and could not be seen from the sea. As a result, the lighthouse was moved to its current location at above sea level in 1877. To access the new site, a long tunnel was hand carved through hard rock. The lighthouse had the first fog signal on the West Coast, in the form of a 24-pounder siege gun. Up until 1940 the lighthouse could be reached by a trail, but

erosion Erosion is the action of surface processes (such as water flow or wind) that removes soil, rock, or dissolved material from one location on the Earth's crust, and then transports it to another location where it is deposited. Erosion is distin ...

caused the trail to crumble into the sea. A wooden walkway was installed, but when that became treacherous a

suspension bridge A suspension bridge is a type of bridge in which the deck (bridge), deck is hung below suspension wire rope, cables on vertical suspenders. The first modern examples of this type of bridge were built in the early 1800s. Simple suspension bridg ...

was built in 1954. This is the only lighthouse in the

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...

which can only be reached by a suspension bridge. The suspension bridge underwent repairs in 1979 and again in 1991, but the metal components were not able to stand up to the

sea spray Sea spray are aerosol particles formed from the ocean, mostly by ejection into Earth's atmosphere by bursting bubbles at the air-sea interface. Sea spray contains both organic matter and inorganic salts that form sea salt aerosol (SSA). SSA ha ...

. As a result, the suspension bridge to the light house was closed to public access on January 6, 2010. According to the

Federal Highway Administration The Federal Highway Administration (FHWA) is a division of the United States Department of Transportation that specializes in highway transportation. The agency's major activities are grouped into two programs, the Federal-aid Highway Program a ...

, the bridge, which was 56 years old, had started to

rust Rust is an iron oxide, a usually reddish-brown oxide formed by the reaction of iron and oxygen in the catalytic presence of water or air moisture. Rust consists of hydrous iron(III) oxides (Fe2O3·nH2O) and iron(III) oxide-hydroxide (FeO(OH ...

. It was replaced by a new span which opened April 13, 2012. The new bridge construction cost a little over $1 million. It is made of tropical

hardwood Hardwood is wood from dicot trees. These are usually found in broad-leaved temperate and tropical forests. In temperate and boreal latitudes they are mostly deciduous, but in tropics and subtropics mostly evergreen. Hardwood (which comes from ...

with steel suspension cables and attachments. The

United States Coast Guard The United States Coast Guard (USCG) is the maritime security, search and rescue, and law enforcement service branch of the United States Armed Forces and one of the country's eight uniformed services. The service is a maritime, military, mult ...

currently maintains the light and fog signal.

Public access

The lighthouse is accessible to the public during limited hours (12:30–3:30 p.m.) on Sundays and Mondays, as well as on ranger-led interpretive sunset hikes, which requires a sign-up. Access to the bridge is barred at other times by a metal door on the shore end of the tunnel. The lighthouse closed in March 2020 for the

COVID-19 pandemic The COVID-19 pandemic, also known as the coronavirus pandemic, is an ongoing global pandemic of coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The novel virus was first identif ...

, but resumed tours two years later on February 20, 2022.

Gallery

In popular media

On the television show '' Murder in the First'' the lighthouse was a setting at the end of the second-season episode "Schizofrenzy". The lighthouse can be found in the video game ''

Watch Dogs 2 ''Watch Dogs 2'' (stylized as ''WATCH_DOGS 2'') is a 2016 action-adventure game developed by Ubisoft Montreal and published by Ubisoft. It is the sequel to 2014's ''Watch Dogs'' and the second installment in the ''Watch Dogs'' series. It was ...

''.

References

External links