[[Image:San Jose-San Francisco-Oakland CSA.svg|thumb|right|240px|Location of the San Jose-San Francisco-Oakland CSA and its component metropolitan areas:

]]The San Francisco Bay Area, commonly known as the Bay Area or simply the Bay, is a metropolitan region that surrounds the San Francisco and San Pablo estuaries in Northern California. The region encompasses large cities such as San Francisco, Oakland, and San Jose, along with smaller urban and rural areas. Overall, the Bay Area consists of nine counties, 101 cities, and 7,000 square miles. The nine counties are Alameda, Contra Costa, Marin, Napa, San Francisco, San Mateo, Santa Clara, Solano, and Sonoma.

The Bay Area when defined as a Combined Statistical Area, is the sixth largest in the country, with approximately 7.4 million people. It encompasses the metropolitan areas of San Francisco (12th largest in the country) and San Jose (31st largest in the country), as well as four other smaller, surrounding metropolitan areas. The Bay Area hosts many cities, towns, military bases, airports, and associated regional, state, and national parks, connected by a massive network of roads, highways, railroads, bridges, tunnels and commuter rail. The combined urban area of San Francisco and San Jose is the 46th largest urban area in the world.

San Francisco is the cultural and financial center of the Bay Area, and has the second highest population density of any major city in North America after New York City. San Jose is the largest city in terms of population, land area, and industrial development. Oakland is a major manufacturing and distribution center, rail terminus/hub, and has the fourth largest container shipping port in the United States. The Bay Area is renowned for its natural beauty, liberal politics, affluence, diversity, and new age reputation.

Subregions

San Francisco

San Francisco is generally placed in a category by itself in terms of culture and geography, and is known locally as "The City." San Francisco is surrounded by water on three sides; the north, east, and west. It is the cultural and urban center of the region. The city is the population center of the region, as it squeezes approximately 800,000 people in only 47 square miles, making it the second most densely populated major city in the United States after New York City. The limitations of land area makes continued population growth challenging for the city, as well as having resulted in increased real estate prices due to the limited availability of land. San Francisco also has the largest commuter population of any city in the Bay Area.

North Bay

The region north of the Golden Gate Bridge is known locally as the North Bay. This area encompasses Marin County, Sonoma County, Napa County and extends eastward into Solano County. The city of Fairfield, being part of Solano County, is often considered the eastern most city of the North Bay, though due to a stronger cultural and socioeconomic similarity to many East Bay cities, it is also often considered the northern most city of the East Bay.

With few exceptions, this region is quite affluent: Marin County is ranked as the wealthiest in the nation. The North Bay is comparatively rural to the remainder of the Bay Area, with many areas of undeveloped open space, farmland and vineyards. Santa Rosa in Sonoma County is the North Bay's largest city, with a population of 157,985 and a Metropolitan Statistical Area population of 466,891, making it the fifth largest city in the San Francisco Bay Area.

The North Bay is the only section of the Bay Area that is not currently served by a commuter rail service. The lack of transportation services is mainly because of the lack of population mass in the North Bay, and the fact that it is separated completely from the rest of the Bay Area by water, the only access points being the Golden Gate Bridge leading to San Francisco, the Richmond-San Rafael and Carquinez Bridges leading to Richmond, and the Benicia-Martinez Bridge leading to Martinez.

Peninsula

The area between San Francisco and the South Bay, geographically part of the San Francisco Peninsula, is known locally as the Peninsula. This area consists of a series of small cities and suburban communities in San Mateo County and the northwestern part of Santa Clara County, as well as various towns along the Pacific coast, such as Pacifica and Half Moon Bay. This area is extremely diverse, although it contains significant populations of affluent family households with the exception of East Palo Alto and some parts of Redwood City. Many of the cities and towns had originally been centers of rural life until the post-World War II era when large numbers of middle and upper class Bay area residents moved in and developed the small villages. Since the 1980s the area has seen a large growth rate of middle and upper class families who have settled in cities like Palo Alto, Woodside, Portola Valley, and Atherton as part of the technology boom of Silicon Valley. Many of these families are of foreign background and have significantly contributed to the diversity of the area. The Peninsula is also home to what used to be one of the deadliest cities in the United States, East Palo Alto. Peninsula cities include: Atherton, Belmont, Brisbane, Burlingame, Colma, Daly City, East Palo Alto, Foster City, Half Moon Bay, Hillsborough, Menlo Park, Millbrae, Pacifica, Portola Valley, Redwood City, Redwood Shores, San Bruno, San Carlos, San Mateo, South San Francisco and Woodside.

East Bay

The eastern side of the bay, consisting of Alameda and Contra Costa counties, is known locally as the East Bay. The East Bay is split into two regions, the inner East Bay, which sits on the Bay shoreline, and the outer East Bay, consisting of inland valleys separated from the inner East Bay by hills and mountains.

• The inner East Bay includes the western portions of Alameda and Contra Costa Counties, including the cities of Oakland, Hayward, Fremont, Berkeley, and Richmond, as well as many smaller suburbs such as Alameda, Castro Valley, Newark, Union City, Emeryville, Albany, San Leandro, San Pablo, El Sobrante, Pinole, Hercules, Rodeo, Piedmont, and El Cerrito. The inner East Bay is more urban, more densely populated, has a much older building stock (built before World War II) and a more ethnically diverse population. Oakland hosts the region's largest seaport and professional sports franchises in basketball, football, and baseball. As with many inner urban areas, the Inner East Bay also features a high incidence of crime as well as other socio-economic problems. According to the FBI Uniform Crime Reports, more than 50% of all homicides in the Bay Area in 2002 occurred within the city limits of Oakland and Richmond. The homicide rates have steadily increased, as 2005 had the highest homicide rates for both Richmond and Oakland in many years.
• The outer East Bay consists of the eastern portions of Alameda and Contra Costa counties and is divided into 5 distinct areas: Lamorinda, Central Contra Costa County, East Contra Costa County, the San Ramon Valley, and the Livermore-Amador Valley. The word Lamorinda was coined by combining the names of the cities it includes: Lafayette, Moraga, and Orinda. Walnut Creek is situated east of Lamorinda and north of the San Ramon Valley and, together with Concord, Martinez, and Pleasant Hill comprises Central Contra Costa County. The cities of Pittsburg, Antioch, Brentwood, Oakley and the unincorporated areas surrounding them comprise East Contra Costa County. The cities of Dublin, Pleasanton, Livermore, comprise the Livermore-Amador Valley (sometimes joined with the San Ramon Valley and called the Tri-Valley), or more popularly referred to as the Livermore Valley because Livermore is the largest city in the valley. The San Ramon Valley consists of Alamo, Danville, Diablo and its namesake, San Ramon to the south. The outer East Bay is connected to the inner East Bay by BART, Interstates 80, 580, and 680, and State Route 24 via the Caldecott Tunnel. The outer East Bay is particularly rural in Livermore , while being part suburban in Pleasanton-Dublin, and its infrastructure was mostly built up after World War II. This area remains largely white demographically, although the Hispanic and Filipino populations have grown significantly over the past 2-3 decades, particularly in the Concord area.

Silicon Valley

The communities along the southern edge of the Bay are known as the South Bay, Santa Clara Valley, and Silicon Valley. Some Peninsula and East Bay towns are sometimes included in the latter. It includes the major city of San Jose, and its suburbs, including the high-tech hubs of Santa Clara, Milpitas, Cupertino, Sunnyvale, Palo Alto and Mountain View as well as many other suburbs like Los Altos, Saratoga, Campbell and Los Gatos and the exurbs of Morgan Hill and Gilroy. Generally, the South Bay is Santa Clara County, but the northwest portion of the county (Palo Alto and Mountain View) is often considered part of the Peninsula instead. Home of Silicon Valley, the South Bay was also an early development of working and middle class families who left the coastal cities of the Eastern Bay south of Oakland and Alameda. Large numbers of families during the post-World War era also moved there for the aerospace industry. This area has long been developed and expanded and is often featured as a stereotype of the typical California suburban city. Today, the growth continues, primarily fueled by technology and cheap immigrant workers. The result has been a huge increase in the value of property forcing many middle class families out of the area or into nascent ghettos in older sections of the region.

Befitting of the title Silicon Valley, this region is home to a vast number of technology sector giants. Some notable tech companies headquartered in the Bay are AMD, Intel, Cisco Systems, Hewlett-Packard, Apple, Google, eBay, and Yahoo!. As a consequence of the rapid growth of these and other companies, the South Bay has gained increasing political and economic influence both within California and throughout the world.

San Jose, the tenth largest city in the United States, and the largest city in the Bay Area, is the financial and cultural center of the Santa Clara Valley. It contains many neighborhoods and a large demographic comparable to San Francisco. San Jose is also home to NHL hockey team San Jose Sharks. The height of buildings in the Financial District of Downtown is limited because the San Jose International Airport's airplane route flies directly over it. Over the past decade, San Jose has experienced rapid growth. To limit the effects of urban sprawl, planned communities were laid out to control growth. San Jose continues to be one of the fastest growing cities in the United States.

Santa Cruz and San Benito

The regional governments in the San Francisco Bay Area, including the Association of Bay Area Governments, the Metropolitan Transportation Commission, the Bay Area Air Quality Management District, and the San Francisco Bay Regional Water Quality Control Board include only the nine counties above in their boundaries or membership. (The BAAQMD includes all of the nine counties except the northern portions of Sonoma and Solano; the RWQCB includes all of San Francisco and the portions of the other eight counties that drain to San Francisco Bay or to the Pacific Ocean.) However, the United States Census Bureau defines the San Jose-San Francisco-Oakland Consolidated Statistical Area as an eleven-county region, including the nine counties above plus Santa Cruz and San Benito Counties. Meanwhile, the California State Parks Department defines the Bay Area as including ten counties, including Santa Cruz but excluding San Benito. On the other hand, Santa Cruz and San Benito along with Monterey County are part of a different regional government organization called the Association of Monterey Bay Area Governments.

Some residents of the Santa Cruz Mountains (Boulder Creek, Brookdale, Ben Lomond, Felton, Scotts Valley) do not usually consider themselves to be residents of the Bay Area, rather just of the Santa Cruz Mountains themselves. The Santa Cruz Mountains run along the spine of the San Francisco Peninsula, beginning in San Francisco and continuing down to their terminus near the City of Gilroy, effectively creating the Santa Clara Valley.

The city of Santa Cruz is geographically isolated from the rest of the San Francisco Bay Area, and is usually considered a part of the Monterey Bay area since the city lies on the north end of the Monterey Bay. The city is also sometimes regarded as the northernmost point of the California Central Coast, which extends along the state's coastline to Santa Barbara.

This partial inclusion of these two counties in the Bay Area is one manifestation of a "spillover" where, because of high housing prices in the Bay Area proper, people with Bay Area jobs purchase homes in outlying areas and endure long commutes. This blurs the outer borders of the Bay Area, which now can be said to spillover not only to the south (Santa Cruz, San Benito, and Monterey counties) but to the Central Valley counties of Sacramento, San Joaquin, Stanislaus, and Yolo.

Demographics

According to the 2007 American Community Survey, the Bay Area's population was 6.958 million, up from 6.784 million in 2000. In 2000 the racial makeup of the 9 County Bay Area was 58.10% white, 19.01% Asian, 0.54% Pacific Islander, 7.53% black, 0.64% Native American, 9.24% from other races, and 4.93% from two or more races. 19.39% of the population was Hispanic or Latino of any race. 27.36% of the population was foreign born; of this, 51.31% from Asia, 32.46% came from Latin America, 11.39% from Europe, 4.84% from other parts of the world.

In 2007 the population density was 1,057 people per square mile. There were 2,499,702 housing units with an average family size of 3.3. Of the 2,499,702 households, approximately one-third were renter occupied housing units, while two-thirds were owner occupied housing units. 12.7% had a female householder with no husband present, 11.6% of households had someone 65 years of age or older, and 27.4% of households were non-families.

Among the 114 Combined Statistical Areas in the United States, San Jose-San Francisco-Oakland has the second highest educational-attainment in both bachelor’s and master's degree attainment, and the second highest median household income after Washington-Baltimore-Northern Virginia.

Political views

The Bay Area is renowned as being among the most liberal areas in the country. According to the Cook Partisan Voting Index (CPVI), congressional districts the Bay Area tends to favor Democratic candidates by roughly 40 to 50 percentage points, considerably above the mean for California and the nation overall. All congressional districts in the region voted for Democrat Barack Obama over Republican John McCain in the 2008 Presidential Election.Over the last four and a half decades the 9-county Bay Area voted for Republican candidates only twice, once in 1972 for Richard Nixon and again in 1980 for Ronald Reagan, both Californians. The last counties to vote for a Republican Presidential candidate was Napa county and San Benito in 1988 for George H. W. Bush.

Presidential election results

Year	Democrat	Republican
2008	73.8% 2,172,411	24.4% 717,989
2004	69.2% 1,926,726	29.3% 815,225
2000	64.1% 1,607,695	30.0% 751,832
1996	60.5% 1,417,511	28.3% 662,263
1992	56.2% 1,476,971	25.0% 658,202
1988	57.8% 1,338,533	40.8% 945,802
1984	50.8% 1,157,855	47.9% 1,090,115
1980	40.7% 827,309	44.4% 904,100
1976	49.9% 950,055	45.8% 872,920
1972	48.2% 990,560	49.1 1,007,615
1968	50.8% 890,650	41.3% 725,304
1964	65.7% 1,116,215	34.1% 579,528
1960	52.0% 820,860	47.6% 751,719

District	Location	Cook PVI	% for Obama, 2008	Median Household Income	Per Capita Income
&066th district	Marin County and southern Sonoma County	D +23	76.0%	$59,115	$33,036
&077th district	Richmond, Vallejo, Vacaville, and Pittsburg	D +19	71.7%	$52,778	$22,016
&088th district	City and County of San Francisco	D +35	85.4%	$52,322	$34,552
&099th district	Oakland, Berkeley and the Oakland hills	D +37	88.1%	$44,314	$25,201
&1010th district	Fairfield, Livermore, Pleasant Hill, and Concord	D +11	64.9%	$65,245	$31,093
&1111th district	Parts of Contra Costa, Alameda, and Santa Clara counties including Morgan Hill, Pleasanton, and San Ramon	R +01	53.8%	$61,996	$28,420
&1212th district	San Francisco Peninsula including most of San Mateo County	D +23	74.3%	$70,307	$34,448
&1313th district	Much of the East Bay, including Fremont, Union City and Hayward	D +22	74.4%	$62,415	$26,076
&1414th district	Silicon Valley, including Redwood City, Mountain View, Sunnyvale, Palo Alto and Santa Cruz	D +21	73.0%	$77,985	$43,063
&1515th district	City of San Jose (western areas)	D +15	68.4%	$74,947	$32,617
&1616th district	San Jose, Morgan Hill	D +16	69.6%	$67,689	$25,064
Median	Districts: 6th, 7th, 8th, 9th, 10th, 12th, 13th, 14th, 15th, 16th	D +21.5	73%	$65,052	$32,826

Affluence

The San Francisco Bay Area is one of the wealthiest regions in the U.S, due to the economies of San Francisco and Silicon Valley. The Bay Area has approximately 123,621 millionaire households. Among medium-sized cities, Pleasanton has the highest household income in the country, and Livermore the third highest. However, disposable income is very comparable with the rest of the country, primarily because the higher cost of living offsets the increased income.

While only 26% of households nationwide boast incomes of over $75,000 a year, 48% of households in the San Francisco Bay Area enjoy such incomes. The percentage of households with incomes exceeding the $100,000 mark in the Bay Area was double the nationwide percentage. Roughly one third (31%) of households in the San Francisco Bay Area had a six figure income, versus less than 16% at the nationwide level. In June 2003, a study by Stanford University reviewing US Census Bureau statistics determined the median household income in the San Francisco Bay Area to be roughly 60% above national average. Overall the largest income bracket in the Bay Area were households making between $100,000 and $150,000 annually, who constituted roughly 18% of households. On a national level the largest income bracket were households with incomes between $30,000 and $40,000 who constituted 13% of all households nationwide.

Six of the top ten California places with the highest per capita income are in the San Francisco Bay Area (Belvedere, Atherton, Woodside, Portola Valley, Diablo). Of the 100 highest income counties by per capita income in the United States, six are in the San Francisco Bay Area (Marin, San Mateo, San Francisco, Santa Clara, Contra Costa, Alameda). According to Forbes Magazine, published in 2005, 12 of the top 50 most expensive Zip Codes are in the Bay Area (Atherton, Ross, Diablo, Belvedere-Tiburon, Nicasio, Portola Valley, Los Altos-Los Altos Hills, Los Gatos-Monte Sereno, the Cow Hollow-Marina District of San Francisco, Alamo, and Burlingame-Hillsborough).

Forty-seven San Francisco Bay Area residents made the Forbes magazine's 400 richest Americans list, published in 2007. Thirteen live within San Francisco proper, placing it seventh among cities in the world. Among the forty-two were several well-known names such as Steve Jobs, George Lucas, and Charles Schwab. The highest-ranking resident is Larry Ellison of Oracle at No. 4. He is worth $19.5 billion. Additionally, a Forbes Magazine survey of the super wealthy concluded that the San Francisco Bay Area had the highest concentration of the super wealthy relative to other locations such as New York City and Dallas. (Forbes Magazine, 12/03/07)

A study by Claritas indicates that in 2004, 5% of all households within the San Francisco and San Jose metropolitan areas held $1 million in investable assets.

As of 2007, there were approximately 80 public companies with annual revenues of over $1 billion a year, and 5-10 more private companies. Nearly 2/3 of these are in the Silicon Valley section of the Bay Area. According to the May 2009 Fortune Magazine analysis of the US "Fortune 500" companies, the combined San Francisco-San Jose metropolitan region ranks second nationally (along with metro Chicago and Houston) with 29 companies. (May 4, Fortune Magazine) Additionally, when the combined total revenue of the Fortune 500 list companies is considered, the San Francisco-San Jose region again ranks second nationally after New York with $884 billion. (May 4, Fortune Magazine)

Living expenses

Although most working-class households in the United States earn between $20,000–$30,000 a year, working-class households in the Bay Area earn up to $50,000 a year performing the same jobs (such as in the service industry), an income which would be considered middle-class in other parts of the country. Nevertheless, because of extremely expensive housing costs, disposable income of working-class Bay Area households is only equivalent to no more than the amount of disposable income in other parts of the country because the rest of the income increase goes to pay for an increased cost of living. Therefore, although the great majority of the population is much more affluent (without taking into account the increased costs of living) compared to the rest of the country, the disposable income is nearly identical, while the some of the value obtained for that portion is significantly smaller due to higher prices for theaters, dining, etc. This enables low cost goods shops, such as variety stores, to maintain a presence in the Bay Area.

Weather

Because the hills, mountains, and large bodies of water produce such vast geographic diversity within this region, the Bay Area offers a significant variety of microclimates. The areas near the Pacific Ocean are generally characterized by relatively small temperature variations during the year, with cool foggy summers and mild rainy winters. Inland areas, especially those separated from the ocean by hills or mountains, have hotter summers and colder overnight temperatures during the winter. Few residential areas ever experience snow, but peaks over (including Mount St. Helena, Mount Hamilton, Mission Peak, Mount Diablo, and Mount Tamalpais) occasionally receive snow. San Jose at the south end of the Bay averages fewer than of rain annually, while Napa at the north end of the Bay averages over 30 and parts of the Santa Cruz Mountains just a few miles west of San Jose get over 55. In the summer, inland regions can be over 40 degrees Fahrenheit (22 degrees Celsius) warmer than the coast. This large temperature contrast induces a strong pressure gradient, which results in brisk coastal winds which help keep the coastal climate cool and typically, foggy during the summer. Additionally, strong winds are produced through gaps in the coastal ranges such as the Golden Gate, the Carquinez Strait, and the Altamont Pass, the latter the site of extensive wind farms. During the fall and winter seasons, when not stormy, a high pressure area is usually present inland, leading to an offshore flow. While negatively impacting air quality, this also clears fog away from the Pacific shore, and so the best weather in San Francisco can usually be found from mid September through mid October. Winter storms are typically wet and mild in temperature during this time of year, being caused by cold fronts sweeping the eastern Pacific and originating from low pressure systems in the Gulf of Alaska. During November into mid March, winter storms are usually several days in length, wet and cool, with severely damaging storms rare. Occasionally during the Summer, spells of warm humid weather will drift over the Bay Area from the Southwest Monsoon or from the residue of Western Pacific hurricanes near Mexico, usually bringing high variable clouds as well, and more rarely, high-based thunderstorms.

Geology and landforms

Multiple terrains

The area is well known worldwide for the complexity of its landforms, the region being composed of at least six terranes (continental, seabed, or island arc fragments with distinct characteristics) pushed together over millions of years by the forces of plate tectonics. As a consequence, many types of rock and soil are found in the region. Formations include the sedimentary rocks of sandstone, limestone, and shale in uplifted seabeds, metamorphic serpentine rock, coal deposits, and igneous forms as the basalt flows and ash deposits of extinct volcanos. Pleistocene-era fossils of mammals are abundantly present in some locations.

Vertical relief

The region has considerable vertical relief in its landscapes that are not in the alluvial plains leading to the bay or in inland valleys. In combination with the extensive water regions this has forced the fragmented development of urban and suburban regions and has led to extensive building on poor soils in the limited flatland areas and considerable expense in connecting the various subregions with roads, tunnels, and bridges. Several mountains are associated with some of the many ridge and hill structures created by compressive forces between the Pacific Plate and the North American plate. These provide spectacular views (in appropriate weather) of large portions of the Bay Area and include Marin County's Mount Tamalpais at 2,571 feet (784 m). Contra Costa County's Mount Diablo at 3,849 feet (1,173 m), Alameda County's Mission Peak at 2,517 to 2,604 feet (767 to 776 m), and Santa Clara County's Mount Hamilton at 4,213 ft (1,284 m), the latter with significant astronomical studies performed at its crowning Lick Observatory. Though Tamalpais and Mission Peak are quite lower than the others, Tamalpais has no other peaks and few hills nearby. Mission Peak is coast facing and is an interior mountain (part of the Diablo Range, all of which are interior) and therefore has excellent views of both sides.

The three major ridge structures (part of the Pacific Coast Range) which are all roughly parallel to the major faultlines:

• The various ranges which form the spine of the San Francisco Peninsula and Marin County (San Andreas Fault)
• The Berkeley Hills, San Leandro Hills and their southern ridgeline extension through Mission Peak (Hayward Fault)
• The Diablo Range, which includes Mount Diablo, Mission Ridge, and Mount Hamilton (Calaveras Fault)

Major waterways

• San Joaquin River
• Sacramento River
• Napa River
• Sonoma Creek
• Guadalupe River
• Coyote Creek
• Petaluma River
• San Pablo Creek
• Wildcat Creek
• Oakland Estuary
• Russian River
• San Lorenzo River
• Gulf of the Farallones
• Alameda Creek

Earthquake faults

The region is also traversed by six major slip-strike fault systems with hundreds of related faults, many of which are "sister faults" of the infamous San Andreas Fault, all of which are stressed by the relative motion between the Pacific Plate and the North American Plate or by compressive stresses between these plates. Significant blind thrust faults (faults with near vertical motion and no surface ruptures) are associated with portions of the Santa Cruz Mountains and the northern reaches of the Diablo Range and Mount Diablo.

Natural hazards

Earthquakes

The region is particularly exposed to hazards associated with large earthquakes, owing to a combination of factors:

• Numerous major active faults in the region.
• A combined thirty year probability of a major earthquake in excess of seventy percent.
• Poorly responding native soil conditions in many places near the bay and in inland valleys, soils which amplify shaking as shown in the map to the right.
• Large areas of filled marshlands and bay mud that are significantly urbanized, with most subject to liquefaction, becoming unable to support structures.
• A large inventory of older buildings, many of which are expected to perform poorly in a major earthquake.
• Extensive building in areas subject to landslide, mudslide, and in some locations directly over active fault surface rubble zones.
• Most lowrise construction is not fireproof and water systems are likely to be extensively damaged and so large areas are subject to destruction by fire after a large earthquake.
• The coastal location makes the region vulnerable to Pacific Ocean tsunamis.

Some of these hazards are being addressed by seismic retrofitting, education in household seismic safety, and even complete replacement of major structures such as the eastern span of the San Francisco – Oakland Bay Bridge.

For an article concerning a typical fault in the region and its associated hazards see Hayward Fault Zone.For projected ground movement after selecting a locality and a generating fault see this ABAG web page

Flooding

Some flooding occurs on local drainages under sustained wet conditions when the ground becomes saturated, more frequently in the North Bay area, which tends to receive substantially more rainfall than the South Bay. In one case, the Napa River drainage, floodplain developments are being purchased and removed and natural wetlands restored in the innovative Napa River Flood Project as the previous channelization of insufficient capacity around such developments was causing flooding problems upstream. Many of the local creeks have been channelized, although modern practice and some restoration work includes returning the creeks to a natural state with dry stormwater bypasses constructed to handle flooding. While quite expensive, the restoration of a natural environment is of high priority in the intensively urbanized areas of the region.

Windstorms and wildfires

Typically between late November and early March, a very strong Pacific storm can bring both substantial rainfall (saturating and weakening soil) and strong wind gusts that can cause trees to fall on power lines. Owing to the wide area involved (sometimes hundreds of miles of coast), service can be interrupted for up to several days in some more remote localities, but service is usually restored quickly in urban areas.

In the spring and fall, strong offshore winds periodically develop. These winds are an especially dangerous fire hazard in the fall when vegetation is at its driest, as exemplified historically by the 1923 Berkeley Fire and the 1991 Oakland Firestorm.

Mudslides and landslides

Some geologically unstable areas have been extensively urbanized, and can become mobile due to changes in drainage patterns and grading created for development. These are usually confined to small areas, but there have been larger problems in the Santa Cruz Mountains.

Transportation

The Bay Area is served by many public transportation systems, including three international airports (SFO, OAK, SJC), six major overlapping bus transit agencies (AC Transit, Muni, SamTrans, VTA, Golden Gate Transit, County Connection), in addition to dozens of smaller ones. There are four rapid transit and regional rail systems including BART and CalTrain and two light rail systems (San Francisco Muni Metro and VTA Light-rail). There are also several regional rail lines provided by Amtrak, notable the Capitol Corridor. In addition to rail lines, there are multiple public and private ferry services (notably Golden Gate Ferry and Blue and Gold Fleet), which are being expanded by the San Francisco Bay Water Transit Authority. The regional ferry hub is San Francisco Ferry Building. AC Transit and some other agencies provide an extensive network of express "transbay" commuter buses from the suburbs to San Francisco Transbay Terminal.

The freeway and highway system is very extensive; however, many freeways are heavily congested during rush hour, especially the trans-bay bridges (Golden Gate and Bay Bridge). Furthermore there are some large gaps in the highways which run onto city streets in San Francisco, partially due to the Freeway Revolt (SF Board of Supervisors decisions made in 1959, 1964 and 1966), which prevented completion of freeways connecting the San Francisco – Oakland Bay Bridge western terminus (Interstate 80) with the southern terminus of the Golden Gate Bridge, and U.S. 101 through San Francisco, and additionally due to the destruction of several of those very freeway structures that sparked the revolt, which were damaged in the 1989 Loma Prieta earthquake and subsequently removed rather than being reinforced or rebuilt.

Higher education

The region is home to many colleges and seminaries, most notably Stanford University, the University of California, Berkeley, and the University of California, San Francisco. In addition, the Bay Area is home to two of the twenty-eight Jesuit universities in the United States, Santa Clara University (founded in 1851), and University of San Francisco (1855), which also hold the distinction of being the two oldest institutions of higher learning in the state of California. Saint Mary's College of California, built in 1863 is also a private college and is administered by the Christian Brothers. In 2003, there were approximately 545,000 students enrolled in college or graduate school. The San Francisco Bay Area population is near the top in the Nation for overall education level with approximately 41 percent of residents aged 25 years and over having a bachelors degree or higher. The San Francisco and San Jose PMSAs rank third and fourth in college graduates, ahead of Boston and behind only Boulder–Longmont, Co PMSA and Stamford–Norwalk, CT PMSA. Santa Cruz PMSA ranks eighth and the Oakland PMSA eleventh.

Public University of California, Berkeley. Berkeley City College Cabrillo College California Maritime Academy California State University, East Bay (Hayward) Cañada College Chabot College City College of San Francisco College of Alameda College of Marin College of San Mateo Contra Costa College De Anza College Diablo Valley College Evergreen Valley College Foothill College Gavilan College Laney College Las Positas College Los Medanos College Merritt College Mission College Napa Valley College Ohlone College San Jose City College San Francisco State University San Jose State University Santa Rosa Junior College Sonoma State University Skyline College Solano Community College West Valley College University of California, Berkeley University of California, Hastings College of the Law University of California, San Francisco University of California, Santa Cruz Seminaries American Baptist Seminary of the West The Church Divinity School of the Pacific (Episcopal) Dominican School of Philosophy and Theology Franciscan School of Theology Fuller Northern California Golden Gate Baptist Theological Seminary Graduate Theological Union Institute of Buddhist Studies Center for Theology and the Natural Sciences Jesuit School of Theology at Berkeley Pacific Lutheran Theological Seminary (ELCA, Berkeley) Pacific School of Religion (UCC, Disciples & Methodist) Saint Patrick Seminary San Francisco Theological Seminary (Presbyterian) Starr King School for the Ministry (Unitarian Universalist)

Zaytuna Institute Private Stanford University. Academy of Art University American College of Traditional Chinese Medicine Argosy University The Art Institute of California — San Francisco The Arts Institute International California College of the Arts California Culinary Academy California Institute of Integral Studies Carnegie Mellon Silicon Valley Cogswell Polytechnical College Culinary Institute of America at Greystone DeVry University Dominican University Ex'pression College for Digital Arts Fashion Institute of Design and Merchandising Five Branches Institute Golden Gate University Holy Names University Institute of Transpersonal Psychology International Technological University John F. Kennedy University Lincoln Law School of San Jose Menlo College Mills College National Hispanic University New College of California Northwestern Polytechnic University Notre Dame de Namur University Pacific Graduate School of Psychology Pacific Union College Patten University Presidio School of Management Saint Mary's College of California San Francisco Art Institute San Francisco Conservatory of Music San Francisco Law School Santa Clara University Saybrook Graduate School and Research Center Stanford University Touro University University of San Francisco University of Northern California

Sports

Team	Sport	League	Venue
San Francisco 49ers	Football	National Conference (National Football League)	Candlestick Park
Oakland Raiders	Football	American Conference (National Football League)	Oakland-Alameda County Coliseum
San Francisco Giants	Baseball	National League (Major League Baseball)	AT&T Park
Oakland Athletics	Baseball	American League (Major League Baseball)	Oakland-Alameda County Coliseum
Golden State Warriors	Basketball	National Basketball Association	Oracle Arena
San Jose Sharks	Ice hockey	National Hockey League	HP Pavilion at San Jose
San Jose Earthquakes	Soccer	Major League Soccer	Buck Shaw Stadium
San Francisco Nighthawks	Soccer	Women's Premier Soccer League	Kezar Stadium
San Jose Giants	Baseball	California League (Minor League Baseball)	San Jose Municipal Stadium
FC Gold Pride	Soccer	Women's Professional Soccer	Buck Shaw Stadium

NCAA Division I College Sports

• California Golden Bears
• Saint Mary's College Gaels
• San Francisco Dons
• San Jose State Spartans
• Santa Clara Broncos
• Stanford Cardinal

Music

Classic rock

San Francisco proper was headquarters for the hippie counterculture of the 1960s and the music scene that became associated with it. One of the area's most notable acts was The Grateful Dead, formed in 1965, who played regularly at the legendary venue The Filmore Auditorium. Other local artists in that movement included Jefferson Airplane and Janis Joplin; all three would be closely associated with the 1967 Summer of Love. Jimi Hendrix - although born in Seattle and later a resident of London, England - had strong connections to the movement and the metropolitan Bay area, as he lived in Berkeley for brief time as a child and played many local venues in that decade. Creedence Clearwater Revival (of El Cerrito) would gain traction as an associated band of the anti-Vietnam war movement.

Heavy metal

During the 1980s and early 1990s, the San Francisco Bay Area was home to one of the largest and most influential thrash metal scenes in the world, containing acts like Exodus, Death Angel, Vio-lence, Megadeth, Forbidden, Testament and Metallica (although Metallica had initially formed in Los Angeles, it wasn't until their relocation to El Cerrito in 1983 that Cliff Burton and Kirk Hammett joined as bassist and lead guitarist, sealing the band's first, formative line-up). Many death metal bands had also formed in the area, including Possessed (considered one of the first in the genre), and in the 90's, bands Impaled, Exhumed and Vile.

Sludge and groove metal bands Machine Head, Neurosis and Skinlab formed in Oakland. In the alternative metal and nu-metal scenes worldwide, Faith No More (from San Francisco) and Primus (from El Sobrante, and featuring former Possessed guitarist Larry LaLonde) have been considered progenitors to both subgenres.

Alternative rock

Many bands of the 1990s post-grunge era started and still reside in the Bay Area, including Third Eye Blind (of San Francisco), Counting Crows (of Berkeley) and Smash Mouth (of San Jose), all of whom have received extensive radio play across the world and released multi-platinum records during their career.

Punk

The Bay Area saw a large punk movement from the 70s to the present. Bands such as the Dead Kennedys, The Avengers, Flipper, D.R.I., M.D.C. and Operation Ivy were popular in the '70s and '80s, with later bands such as Rancid, Green Day and AFI all coming out of Berkeley.

Rap and hip hop

The Bay Area was the home of the hyphy movement, which started almost 10 years ago. The genre which was pioneered by rappers Andre "Mac Dre" Hicks, Too Short, Keak Da Sneak, and E-40, is now becoming more popular throughout the world. Hyphy themes such as ghost riding, thizzin' and going dumb are now common in other parts of the country. The Bay Area is also home to rap legend Tupac Shakur who lived in Marin City, about 5 miles north of San Francisco,and even Hammer and the Hieroglyphics hip hop crew, which is composed of local artists including the Souls of Mischief and Del tha Funkee Homosapien.

Regional counties, cities and suburbs

Counties

Note: San Benito County and Santa Cruz County are sometimes considered not part of the Bay Area.

• Alameda County (737 sq. mi., excluding water)
• Contra Costa County (720 sq. mi., excluding water)
• Marin County (520 sq. mi., excluding water)
• Napa County (754 sq. mi., excluding water)
• San Benito County (1389 sq. mi., excluding water)
• San Francisco County (47 sq. mi., excluding water)
• San Mateo County (449 sq. mi., excluding water)
• Santa Clara County (1,291 sq. mi., excluding water)
• Santa Cruz County (445 sq. mi., excluding water)
• Solano County (829 sq. mi., excluding water)
• Sonoma County (1,576 sq. mi., excluding water)

Cities and municipalities

• List of cities and municipalities in the San Francisco Bay Area

See also

• Coastal California
• Islands of San Francisco Bay
• List of San Francisco Bay Area festivals and fairs
• List of San Francisco Bay Area wildflowers
• List of San Francisco Bay Area writers
• United States metropolitan area
• List of people from Oakland, California
• List of people from Berkeley, California
• List of companies headquartered in San Francisco and the Greater Bay Area

References

1. San Francisco Bay Area Vision Project
2. The Association of Bay Area Governments
3. http://www.census.gov/popest/metro/tables/2008/CBSA-EST2008-02.xls
4. http://en.allexperts.com/e/l/li/list_of_selected_cities_by_population_density.htm
5. Regional Water Quality Control Board, San Francisco Bay Region (2) Boundaries Accessed 2007-02-20
6. http://www.bayareacensus.ca.gov/bayarea.htm
7. Raleigh-Durham area ranks third in U.S. for college degrees
8. CSA Median household income
9. 2008 California Presidential Election Results by Congressional District
10. http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2008/06/25/BU1611EF3L.DTL
11. [1]
12. http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2008/03/06/BUS1VEBPS.DTL
13. [2] "Assets".
14. http://quake.abag.ca.gov/ - Maps and information about Bay Area threats including earthquakes, landslides, and tsunamis.
15. http://earthquake.usgs.gov/regional/nca/1868virtualtour/bayarea.php/ USGS site with Google Earth KMZ files related to geology and seismic activity
16. Describes Bay Area damage from 1960 tsunami.
17. U.S. Census Bureau, 2003 American Community Survey, accessed November 5, 2007
18. 2002 American Community Survey, SELECTED POPULATION CHARACTERISTICIS FOR LARGE METROPOLITAN AREAS, accessed November 5, 2007
19. Essi Berelian (2005), The Rough Guide to Heavy Metal, p. 259, "Faith No More must be counted among the pioneers [of nu metal]"
20. Joel McIver (2002), NU-METAL- The Next Generation Of Rock & Punk

External links

• Bay Area Hiker Bay Area Hiker explores the diverse and wonderful spectrum of hiking in the San Francisco bay area
• limuguide.com/sfbay Live Music in San Francisco Bay Area
• Bay Area Experiences.com Community-built site with non-touristy things to do in San Francisco and surrounding areas.

Travel

• World War II in the San Francisco Bay Area, a National Park Service Discover Our Shared Heritage Travel Itinerary