San Francisco Bay drains water from approximately 40 percent of California. Water from the Sacramento and San Joaquin rivers, and from the Sierra Nevada mountains, flow into Suisun Bay, which then travels through the Carquinez Strait to meet with the Napa River at the entrance to San Pablo Bay, which connects at its south end to San Francisco Bay. It then connects to the Pacific Ocean via the Golden Gate strait. However, this entire group of interconnected bays is often called the San Francisco Bay. The bay was designated a Ramsar Wetland of International Importance on February 2, 2013, and the Port of Oakland on the bay is one of the busiest cargo ports on the west coast.
Size
The bay covers somewhere between 400 and 1,600 square miles (1,000–4,000km2), depending on which sub-bays (such as San Pablo Bay), estuaries, wetlands, and so on are included in the measurement.[4][5][6] The main part of the bay measures threeto twelve miles (5–19km) wide east-to-west and somewhere between 48 miles (77km)1 and 60 miles (97km)2 north-to-south.
San Francisco Bay is the second-largest estuary on the Pacific coast of the Americas, following the Salish Sea in Washington State and British Columbia, Canada.[7]
The bay was navigable as far south as San Jose until the 1850s, when hydraulic mining released massive amounts of sediment from the rivers that settled in those parts of the bay that had little or no current. Later, wetlands and inlets were deliberately filled in, reducing the bay's size since the mid-19th century by as much as one third. Recently, large areas of wetlands have been restored, further confusing the issue of the bay's size. Despite its value as a waterway and harbor, many thousands of acres of marshy wetlands at the edges of the bay were, for many years, considered wasted space. As a result, soil excavated for building projects or dredged from channels was often dumped onto the wetlands and other parts of the bay as landfill.[citation needed]
From the mid-19th century through the late 20th century, more than a third of the original bay was filled and often built on. The deep, damp soil in these areas is subject to soil liquefaction during earthquakes, and most of the major damage close to the bay in the Loma Prieta earthquake of 1989 occurred to structures on these areas.[citation needed]
The Marina District of San Francisco, hard hit by the 1989 earthquake, was built on fill that had been placed there for the Panama-Pacific International Exposition, although liquefaction did not occur on a large scale. In the 1990s, San Francisco International Airport proposed filling in hundreds more acres to extend its overcrowded international runways in exchange for purchasing other parts of the bay and converting them back to wetlands. The idea was, and remains, controversial. (For further details, see the "Bay fill and depth profile" section.)
There are five large islands in San Francisco Bay. Alameda, the largest island, was created when a shipping lane was cut to form the Port of Oakland in 1901. It is now a suburban community. Angel Island was known as "Ellis Island West" because it served as the entry point for immigrants from East Asia. It is now a state park accessible by ferry. Mountainous Yerba Buena Island is pierced by a tunnel linking the east and west spans of the San Francisco–Oakland Bay Bridge. Attached to the north is the artificial and flat Treasure Island, site of the 1939 Golden Gate International Exposition. From the Second World War until the 1990s, both islands served as military bases and are now being redeveloped. Isolated in the center of the bay is Alcatraz, the site of the famous federal penitentiary. The federal prison on Alcatraz Island no longer functions, but the complex is a popular tourist site. Despite its name, Mare Island in the northern part of the bay is a peninsula rather than an island.[citation needed]
Population density and low elevation coastal zones in San Francisco Bay (2010). The San Francisco Bay is especially vulnerable to sea level rise.
San Francisco Bay is thought to represent a down-warping of the Earth's crust between the San Andreas Fault to the west and the Hayward Fault to the east, though the precise nature of this remains under study. About 560,000 years ago, a tectonic shift caused the large inland Lake Corcoran to spill out the central valley and through the Carquinez Strait, carving out sediment and forming canyons in what is now the northern part of the San Francisco Bay and Golden Gate strait.[8]
San Francisco Bay has been filled and emptied of sea water many times during the Pleistocene in accordance with sea level changes caused by glacial advances and retreats.[9] During the Wisconsin Glaciation, between 15,000 and about 10,000 years ago, the basin which is now filled by the San Francisco Bay was a large river valley with small hills, channeling the Sacramento River through the Golden Gate Strait into the ocean.[9] When the great ice sheets began to melt, around 11,000 years ago, the sea level started to rise rapidly, by about 1 inch per year.[10] Melting glaciers in the Sierra Nevada washed huge amounts of sediment down the Sacramento and San Joaquin rivers, which accumulated on the shores of the bay, forming huge mudflats and marshes that supported local wildlife.[10] By 5000BC the sea level rose 300 feet (90m), filling the valley with water from the Pacific.[10] The Farallon Islands are what used to be hills along the old coastline,[10] and Potato Patch Shoal is an area of sand dunes now covered by the ocean.[9]
The first recorded European discovery of San Francisco Bay was on November 4, 1769, when Spanish explorer Gaspar de Portolá, unable to find the Port of Monterey, continued north close to what is now Pacifica and reached the summit of the 1,200-foot-high (370m)Sweeney Ridge, now marked as the place where he first sighted San Francisco Bay. Portolá and his party did not realize what they had discovered, thinking they had arrived at a large arm of what is now called Drakes Bay.[14] At the time, Drakes Bay went by the name Bahia de San Francisco and thus both bodies of water became associated with the name. Eventually, the larger, more important body of water fully appropriated the name San Francisco Bay.[citation needed]
The first European to enter the bay is believed to have been the Spanish explorer Juan de Ayala, who passed through the Golden Gate on August 5, 1775, in his ship the San Carlos and moored in a bay of Angel Island now known as Ayala Cove. Ayala continued to explore the San Francisco Bay Area and the expedition's cartographer, José de Cañizares, gathered the information necessary to produce the first map of the area. A number of place names survive (anglicized) from that first map, including Point Reyes, Angel Island, Farallon Islands, and Alcatraz Island.[citation needed]
Alaskan Native sea otter hunters using Aleutian kayaks and working for the Russian–American Company entered San Francisco Bay in 1807 and again over 1810–1811. Led by the Russian Timofei Nikitich Tarakanov, these hunting raids probably wiped out sea otters in the bay. Thousands of sea otter skins were taken to Sitka, then Guangzhou (Canton), China, where they commanded a high price.[15][16]
The United States seized the region from Mexico during the Mexican–American War (1846–1848). On February 2, 1848, the Mexican province of Alta California was annexed to the United States with the signing of the Treaty of Guadalupe Hidalgo. A year and a half later, California requested to join the United States on December 3, 1849, and was accepted as the 31st State of the Union on September 9, 1850.[citation needed]
San Francisco Bay Shoreline Tablet
In 1921, a tablet was dedicated by a group of men in downtown San Francisco, marking the site of the original shoreline. The tablet reads: "This tablet marks the shore line of San Francisco Bay at the time of the discovery of gold in California, January 24, 1848. Map reproduced above delineates old shore line. Placed by the Historic Landmarks committee, Native Sons of the Golden West, 1921."[17]
The bay became the center of American settlement and commerce in the Far West through most of the remainder of the 19th century. During the California Gold Rush (1848–1855), San Francisco Bay suddenly became one of the world's great seaports, dominating shipping in the American West until the last years of the 19th century. The bay's regional importance increased further when the first transcontinental railroad was connected to its western terminus at Alameda on September 6, 1869.[18] The terminus was switched to the Oakland Long Wharf two months later on November 8, 1869.[19]
Duck hunting on the Bay, 1915Mallard II, a clamshell dredge built in 1936 and used into the 21st century to dredge levees for Cargill's salt ponds in the bay
During the 20th century, the bay was subject to the 1940s Reber Plan, which would have filled in parts of the bay in order to increase industrial activity along the waterfront. In 1959, the United States Army Corps of Engineers released a report stating that if current infill trends continued, the bay would be as big as a shipping channel by 2020. This news created the Save the Bay movement in 1960,[28] which mobilized to stop the infill of wetlands and the bay in general, which had shrunk to two-thirds of its size in the century before 1961.[29]
The San Francisco Bay continues to support some of the densest industrial production and urban settlement in the United States. The San Francisco Bay Area is the American West's second-largest urban area, with approximately seven million residents.[30]
Most famously, the bay is a key link in the Pacific Flyway. Millions of waterfowl annually use the bay shallows as a refuge. Two endangered species of birds are found here: the California least tern and the Ridgway's Rail. Exposed bay muds provide important feeding areas for shorebirds, but underlying layers of bay mud pose geological hazards for structures near many parts of the bay perimeter. San Francisco Bay provided the nation's first wildlife refuge, Oakland's artificial Lake Merritt, constructed in the 1860s, and America's first urban National Wildlife Refuge, the Don Edwards San Francisco Bay National Wildlife Refuge (SFBNWR) in 1972. The bay is also plagued by non-native species.[citation needed]
Salt produced from San Francisco Bay is produced in salt evaporation ponds and is shipped throughout the Western United States to bakeries, canneries, fisheries, cheese makers and other food industries and used to de-ice winter highways, clean kidney dialysis machines, for animal nutrition, and in many industries. Many companies have produced salt in the bay, with the Leslie Salt Company the largest private land owner in the Bay Area in the 1940s.[32][33]
Low-salinity salt ponds mirror the ecosystem of the bay, with fish and fish-eating birds in abundance. Mid-salinity ponds support dense populations of brine shrimp, which provide a rich food source for millions of shorebirds. Only salt-tolerant micro-algae survive in the high salinity ponds, and impart a deep red color to these ponds from the pigment within the algae protoplasm. The salt marsh harvest mouse is an endangered species endemic to the wetlands of the San Francisco Bay with a high salt tolerance. It needs native pickleweed, which is often displaced by invasive cordgrass, for its habitat.[34]
The seasonal range of water temperature in the bay is from January's 53°F (12°C) to September's 60°F (16°C) when measured at Fort Point, which is near the southern end of the Golden Gate Bridge and at the entrance to San Francisco Bay.[35]
For the first time in 65 years, Pacific Harbor Porpoise (Phocoena phocoena) returned to the bay in 2009.[36] Golden Gate Cetacean Research, a non-profit organization focused on research on cetaceans, has developed a photo-identification database enabling the scientists to identify specific porpoise individuals and is trying to ascertain whether a healthier bay has brought their return.[37] Pacific harbor porpoise range from Point Conception, California, to Alaska and across to the Kamchatka Peninsula and Japan. Recent genetic studies show that there is a local stock from San Francisco to the Russian River and that eastern Pacific coastal populations rarely migrate far, unlike western Atlantic Harbor porpoise.[38]
The common bottlenose dolphin (Tursiops truncatus) has been extending its current range northwards from the Southern California Bight. The first coastal bottlenose dolphin in the Bay Area in recent times was spotted in 1983 off the San Mateo County coast in 1983. In 2001, bottlenose dolphins were first spotted east of the Golden Gate Bridge and confirmed by photographic evidence in 2007. Zooarcheological remains of bottlenose dolphins indicated that bottlenose dolphins inhabited San Francisco Bay in prehistoric times until at least 700 years before present, and dolphin skulls dredged from the bay suggest occasional visitors in historic times.[39]
Pollution
San Francisco Bay faces many of the same water quality issues as other urban waterways in industrialized countries, or downstream of intensive agriculture. According to state water quality regulators, San Francisco Bay waters do not meet water quality standards for the following pollutants:[40]
Industrial, mining, and other uses of mercury have resulted in a widespread distribution in the bay, with uptake in the bay's phytoplankton and contamination of its sportfish.[41]
Oil spills
In January 1971, two Standard Oil tankers collided in the bay, creating an 800,000-U.S.-gallon (3,000,000-liter)oil spill disaster, which spurred environmental protection of the bay. In November 2007, a ship named COSCO Busan collided with the San Francisco–Oakland Bay Bridge and spilled over 58,000 U.S. gallons (220,000 liters) of bunker fuel, creating the largest oil spill in the region since 1996.[42]
Nutrients
The bay also has some of the highest levels of dissolved inorganic nitrogen known from any coastal water body, mostly originating from treated wastewater from Publicly owned treatment works.[43] In other bays, such nutrient levels would likely lead to eutrophication, but historically, the bay has had less harmful algal blooms than other water bodies with similar nutrient concentrations. Potential explanations have included the presence of intensive "top-down control" from grazing clams like Potamocorbula, high sediment supply limiting light availability for the algae, and intensive tidal mixing. The occurrence of an unprecedented harmful algal bloom of Heterosigma akashiwo in 2022, resulting in mass fish deaths and anoxia,[44] suggests that the mechanisms of control on algal growth may be eroding.
PBDEs
The bay was once considered a hotspot for polybrominated diphenyl ether (PBDE) flame retardants used to make upholstered furniture and infant care items less flammable. PBDEs have been largely phased out and replaced with alternative phosphate flame retardants. A 2019 San Francisco Estuary Institute (SFEI) study assayed a wide range of these newer flame retardant chemicals in Bay waters, bivalve California mussels (Mytilus californianus), and harbor seals (Phoca vitulina) which haul out in Corkscrew Slough[45] on Bair Island in San Mateo County, with phosphate flame retardant contaminants such as tris(1,3-dichloro-2-propyl)phosphate (TDCPP) and triphenyl phosphate (TPhP) found at levels comparable to thresholds for aquatic toxicity.[46]
Emerging contaminants
Thousands of man-made chemicals are found in Bay water, sediment, and organisms. For many of these, there is little or no data on their impacts on the environment or human health, and they are not regulated by state or federal law. These are often referred to as "contaminants of emerging concern." The San Francisco Estuary Institute has studied these chemicals in the Bay since 2001.[47] Scientists have identified the following most likely to have a negative impact on Bay wildlife:[48]
San Francisco Bay and the Golden Gate Bridge, looking southeast towards the City and East Bay. Alcatraz is the small islet in the upper-middle left.
San Francisco Bay's profile changed dramatically in the late 19th century and again with the initiation of dredging by the US Army Corps of Engineers in the 20th century. Before about 1860, most bay shores (with the exception of rocky shores, such as those in Carquinez Strait; along Marin shoreline; Point Richmond; Golden Gate area) contained extensive wetlands that graded nearly invisibly from freshwater wetlands to salt marsh and then tidal mudflat. A deep channel ran through the center of the bay, following the ancient drowned river valley.[citation needed]
In the 1860s and continuing into the early 20th century, miners dumped staggering quantities of mud and gravel from hydraulic mining operations into the upper Sacramento and San Joaquin Rivers. GK Gilbert's estimates of debris total more than eight times the amount of rock and dirt moved during construction of the Panama Canal. This material flowed down the rivers, progressively eroding into finer and finer sediment, until it reached the bay system. Here some of it settled, eventually filling in Suisun Bay, San Pablo Bay, and San Francisco Bay, in decreasing order of severity.[citation needed]
By the end of the 19th century, these "slickens" had filled in much of the shallow bay flats, raising the entire bay profile. New marshes were created in some areas.[citation needed]
Cargo ships in San Francisco Bay in 2012
In the decades surrounding 1900, at the behest of local political officials and following Congressional orders, the U.S. Army Corps began dredging the Sacramento and San Joaquin Rivers and the deep channels of San Francisco Bay. This work has continued without interruption ever since. Some of the dredge spoils were initially dumped in the bay shallows (including helping to create Treasure Island on the former shoals to the north of Yerba Buena Island) and used to raise islands in the Sacramento-San Joaquin Delta. The net effect of dredging has been to maintain a narrow deep channel—deeper perhaps than the original bay channel—through a much shallower bay. At the same time, most of the marsh areas have been filled or blocked off from the bay by dikes.
Large ships transiting the bay must follow deep underwater channels that are maintained by frequent dredging as the average depth of the bay is only as deep as a swimming pool—approximately 12to 15ft (4–5m). Between Hayward and San Mateo to San Jose it is 12to 36in (30–90cm). The deepest part of the bay is under and out of the Golden Gate Bridge, at 372ft (113m).[49]
In the late 1990s, a 12-year harbor-deepening project for the Port of Oakland began; it was largely completed by September 2009. Previously, the bay waters and harbor facilities only allowed for ships with a draft of 46ft (14m), but dredging activities undertaken by the United States Army Corps of Engineers in partnership with the Port of Oakland succeeded in providing access for vessels with a 50-foot (15m) draft. Four dredging companies were employed in the US$432million project, with $244million paid for with federal funds and $188million supplied by the Port of Oakland. Some sixmillion cubic yards (160million cubic feet; 4.6million cubic meters) of mud from the dredging was deposited at the western edge of Middle Harbor Shoreline Park to become a 188-acre (0.294sqmi; 0.76km2) shallow-water wetlands habitat for marine and shore life.[50][51] Further dredging followed in 2011, to maintain the navigation channel.[52][53] This dredging enabled the arrival of the largest container ship ever to enter the San Francisco Bay, the MSC Fabiola. Bay pilots trained for the visit on a simulator at the California Maritime Academy for over a year. The ship arrived drawing less than its full draft of 50feet 10inches (15.5m) because it held only three-quarters of a load after its stop in Long Beach.[54]
San Francisco Bay was traversed by watercraft before the arrival of Europeans. Indigenous peoples used canoes to fish and clam along the shoreline. Sailing ships enabled transportation between the bay and other parts of the world—and served as ferries and freighters within the bay and between the bay and inland ports, such as Sacramento and Stockton. These were gradually replaced by steam-powered vessels starting in the late 19th century. Several shipyards were established around the bay, augmented during wartime (e.g., the Kaiser Shipyards, Richmond Shipyards) near Richmond in 1940 for World War II for construction of mass-produced, assembly line Liberty and Victory cargo ships.[citation needed]
San Francisco Bay is spanned by nine bridges, eight of which carry cars.[citation needed]
The Golden Gate Bridge on U.S. Route101/State Route1 (US101/SR1) was the largest single span suspension bridge ever built at the time of its 1937 construction. It spans the Golden Gate, the strait between San Francisco and Marin County, and is the only bridge in the area not owned by the State of California.
Prior to the bridges and, later, the Transbay Tube, transbay transportation was dominated by fleets of ferryboats operated by the Southern Pacific Railroad and the Key System transit company. However, in recent decades, ferries have returned, primarily serving commuters from Marin County, relieving the traffic bottleneck of the Golden Gate Bridge (see Ferries of San Francisco Bay).[citation needed]
The San Francisco Bay Area Water Trail is a planned system of designated trailheads designed to improve non-motorized small boat access to the bay. The California Coastal Conservancy approved funding in March 2011 to begin implementation of the water trail.
San Francisco Bay panorama with a view of sailboats, kite boarders, and the Crissy Field Beach
The Golden Gate is a strait on the west coast of North America that connects San Francisco Bay to the Pacific Ocean. It is defined by the headlands of the San Francisco Peninsula and the Marin Peninsula, and, since 1937, has been spanned by the Golden Gate Bridge. The entire shoreline and adjacent waters throughout the strait are managed by the Golden Gate National Recreation Area.
Benicia State Recreation Area is a state park unit of California, United States, protecting tidal wetland. It is located in the Solano County city of Benicia, 2 miles (3.2 km) west of downtown Benicia and borders Vallejo's Glen Cove neighborhood. The park covers 447 acres (181 ha) of marsh, grassy hillsides and rocky beaches along the narrowest portion of the Carquinez Strait. Southampton Creek and the tidal marsh front Southampton Bay, where the combined waters of the Sacramento and San Joaquin Rivers approach San Pablo Bay, the northern portion of San Francisco Bay.
The Sacramento–San Joaquin River Delta, or California Delta, is an expansive inland river delta and estuary in Northern California. The Delta is formed at the western edge of the Central Valley by the confluence of the Sacramento and San Joaquin rivers and lies just east of where the rivers enter Suisun Bay, which flows into San Francisco Bay, then the Pacific Ocean via San Pablo Bay. The Delta is recognized for protection by the California Bays and Estuaries Policy. Sacramento–San Joaquin Delta was designated a National Heritage Area on March 12, 2019. The city of Stockton is located on the San Joaquin River at the eastern edge of the delta. The total area of the Delta, including both land and water, is about 1,100 square miles (2,800 km2). Its population is around 500,000.
San Diego Bay is a natural harbor and deepwater port in San Diego County, California, near the Mexico–United States border. The bay, which is 12 miles (19 km) long and 1 to 3 miles wide, is the third largest of the three large, protected natural bays on California's 840 miles (1,350 km) of coastline, after San Francisco Bay and Humboldt Bay. The highly urbanized land adjacent to the bay includes the city of San Diego and four other cities: National City, Chula Vista, Imperial Beach and Coronado. The bay is considered to be one of the premier natural harbors on the West Coast.
The Oakland Seaport is a major container ship facility located in Oakland, California, in the San Francisco Bay. It is operated by the Port of Oakland port authority along with the San Francisco Bay Oakland International Airport. It was the first major port on the Pacific Coast of the United States to build terminals for container ships. As of 2022, it was the eighth busiest container port in the United States, behind the ports of Los Angeles, New York/New Jersey, Long Beach, Savannah, Houston, Virginia, and Seattle/Tacoma. Development of an intermodal container handling system in 2002 after over a decade of planning and construction positions the Oakland Seaport for further expansion of the West Coast freight market share. In 2019 it ranked 8th in the United States in the category of containers.
Humboldt Bay is a natural bay and a multi-basin, bar-built coastal lagoon located on the rugged North Coast of California, entirely within Humboldt County, United States. It is the largest protected body of water on the West Coast between San Francisco Bay and Puget Sound, the second-largest enclosed bay in California, and the largest port between San Francisco and Coos Bay, Oregon. The largest city adjoining the bay is Eureka, the regional center and county seat of Humboldt County, followed by the city of Arcata. These primary cities, together with adjoining unincorporated communities and several small towns, comprise a Humboldt Bay Area with a total population of nearly 80,000 people. This comprises nearly 60% of the population of Humboldt County. The bay is home to more than 100 plant species, 300 invertebrate species, 100 fish species, and 200 bird species. In addition, the bay and its complex system of marshes and grasses support hundreds of thousands of migrating and local shore birds. Commercially, this second-largest estuary in California is the site of the largest oyster production operations on the West Coast, producing more than half of all oysters farmed in California.
The Port of San Francisco is a semi-independent organization that oversees the port facilities at San Francisco, California, United States. It is run by a five-member commission, appointed by the Mayor subject to confirmation by a majority of the Board of Supervisors. The Port is responsible for managing the larger waterfront area that extends from the anchorage of the Golden Gate Bridge, along the Marina district, all the way around the north and east shores of the city of San Francisco including Fisherman's Wharf and the Embarcadero, and southward to the city line just beyond Candlestick Point. In 1968, the State of California, via the California State Lands Commission for the State-operated San Francisco Port Authority, transferred its responsibilities for the Harbor of San Francisco waterfront to the City and County of San Francisco / San Francisco Harbor Commission through the Burton Act AB2649. All eligible State port authority employees had the option to become employees of the City and County of San Francisco to maintain consistent operation of the Port of San Francisco.
Mission Bay is an artificial, saltwater bay located south of the Pacific Beach community of San Diego, California, created from approximately 2,000 acres (810 ha) of historical wetland, marsh, and saltwater bay habitat. The bay is part of the recreational Mission Bay Park, the largest man-made aquatic park in the United States, consisting of 4,235 acres (17.14 km2), approximately 46% land and 54% water. The combined area makes Mission Bay Park the ninth largest municipally-owned park in the United States.
The Oakland Long Wharf was an 11,000-foot railroad wharf and ferry pier along the east shore of San Francisco Bay located at the foot of Seventh Street in West Oakland. The Oakland Long Wharf was built, beginning 1868, by the Central Pacific Railroad on what was previously Oakland Point. Beginning November 8, 1869, it served as the west coast terminus of the First transcontinental railroad. In the 1880s, Southern Pacific Railroad took over the CPRR, extending it and creating a new ferry terminal building with the official station name Oakland Pier. The entire structure became commonly and popularly called the Oakland Mole. Portions of the Wharf lasted until the 1960s. The site is now part of the facilities of the Port of Oakland, while passenger train service operates at the nearby Jack London Square/Dellums Station and another nearby station in Emeryville.
The Oakland Estuary is the strait in the San Francisco Bay Area, California, separating the cities of Oakland and Alameda and the Alameda Island from the East Bay mainland. On its western end, it connects to San Francisco Bay proper, while its eastern end connects to San Leandro Bay.
San Francisco Bay in California has been served by ferries of all types for over 150 years. John Reed established a sailboat ferry service in 1826. Although the construction of the Golden Gate Bridge and the San Francisco–Oakland Bay Bridge led to the decline in the importance of most ferries, some are still in use today for both commuters and tourists.
California's transportation system is complex and dynamic. Although known for its car culture and extensive network of freeways and roads, the state also has a vast array of rail, sea, and air transport. Several subway, light rail, and commuter rail networks are found in many of the state's largest population centers. In addition, with the state's location on the West Coast of the United States, several important ports in California handle freight shipments from the Pacific Rim and beyond. A number of airports are also spread out across the state, ranging from small general aviation airports to large international hubs like Los Angeles International Airport and San Francisco International Airport.
Middle Harbor Shoreline Park (MHSP) is located on San Francisco Bay and the Oakland Seaport entrance channel, west of downtown Oakland, California. It is owned and operated by the Port of Oakland. The park entrance is at the intersection of 7th Street and Middle Harbor Road. It is open seven days a week from 8 a.m. to dusk.
Seal Slough, also known as Marina Lagoon, is a narrow winding tidal channel through a tidal marsh in San Mateo and Foster City, California. This slough has been the object of a wetland restoration project in recent years to enhance habitat value. Dredging has been carried out in Seal Slough since at least 1954. When the original sewage treatment plant for the city of San Mateo was constructed in 1935, its discharge was directed to Seal Slough.
The Hydrography of the San Francisco Bay Area is a complex network of watersheds, marshes, rivers, creeks, reservoirs, and bays predominantly draining into the San Francisco Bay and Pacific Ocean.
The San Francisco Estuary together with the Sacramento–San Joaquin River Delta represents a highly altered ecosystem. The region has been heavily re-engineered to accommodate the needs of water delivery, shipping, agriculture, and most recently, suburban development. These needs have wrought direct changes in the movement of water and the nature of the landscape, and indirect changes from the introduction of non-native species. New species have altered the architecture of the food web as surely as levees have altered the landscape of islands and channels that form the complex system known as the Delta.
Alhambra Creek is a stream in Contra Costa County, in the East Bay region of the San Francisco Bay Area in northern California.
Stockton Deepwater Shipping Channel also called the Baldwin-Stockton Deepwater Shipping Channel or Stockton Deep Water Channel is a manmade deepwater water channel that runs from Suisun Bay and the Sacramento River - Sacramento Deep Water Ship Channel to the Port of Stockton and the Stockton Channel in California. The Stockton Ship Channel is 41 mi (66 km) long and about 37 ft (11 m) deep, allowing up to Panama Canal size ocean ships access to the Port of Stockton at the City of Stockton. The Stockton Deepwater Shipping Channel is part of the vast Sacramento–San Joaquin River Delta that has a connection to the Pacific Ocean. Stockton Deepwater Shipping Channel is also called the lower San Joaquin River.
Mallard II is a wooden-hulled clamshell dredger used to maintain levees on the San Francisco Bay Salt Ponds. Mallard II was constructed in 1936, and is "probably the oldest operating dredge in California"; she is owned and operated by Cargill Salt.
Golden Gate Bird Alliance is an American 501(c)(3) non-profit environmental organization engaged in bird conservation and environmental awareness. Headquartered in the David Brower Center in Berkeley, California, Golden Gate Bird Alliance was formed in 1917 and incorporated into the National Audubon Society in 1948. With 3,586 members and supporters, Golden Gate Bird Alliance spans Northern California, with a particular focus on San Francisco County, West Alameda County, and West Contra Costa County.
1 2 3 4 Yabrove, Daniel (December 9, 2013). "How the Bay was Born". Save The Bay Blog. Save The Bay. Archived from the original on June 20, 2018. Retrieved June 4, 2018.
↑ The Barrier Broken – Vallejo Evening Chronicle, May 21, 1927
↑ "Two Bay Area Bridges". U.S. Department of Transportation. January 18, 2005. Archived from the original on October 11, 2009. Retrieved June 13, 2008.
↑ "Salt Marsh Harvest Mouse"(PDF). South Bay Salt Pond Restoration Project. Archived(PDF) from the original on March 20, 2017. Retrieved September 25, 2019.
↑ United States. Army. Corps of Engineers. San Francisco District, Port of Oakland (1998). Oakland harbor navigation improvement (−50-foot) project: draft environmental impact statement/environmental impact report: executive summary. U.S. Army Corps of Engineers, San Francisco District.
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