The Tri-Valley area is grouping of three valleys in the East Bay region of

California California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the ...

Bay Area The San Francisco Bay Area, often referred to as simply the Bay Area, is a populous region surrounding the San Francisco, San Pablo, and Suisun Bay estuaries in Northern California. The Bay Area is defined by the Association of Bay Area Go ...

. The three valleys are Amador Valley, San Ramon Valley, and Livermore Valley. The Tri-Valley encompasses the cities of

Dublin Dublin (; , or ) is the capital and largest city of Ireland. On a bay at the mouth of the River Liffey, it is in the province of Leinster, bordered on the south by the Dublin Mountains, a part of the Wicklow Mountains range. At the 2016 ...

, Livermore,

Pleasanton Pleasanton may refer to: Places * Pleasanton, California * Pleasanton, Iowa * Pleasanton, Kansas * Pleasanton, Nebraska * Pleasanton, New Mexico * Pleasanton, Ohio * Pleasanton, Texas * Pleasanton Township, Michigan Other * Pleasanton High School ...

and San Ramon, the town of Danville and the CDPs of

Alamo The Battle of the Alamo (February 23 – March 6, 1836) was a pivotal event in the Texas Revolution. Following a 13-day siege, Mexican troops under President General Antonio López de Santa Anna reclaimed the Alamo Mission near San An ...

, Blackhawk and Diablo. The area is known for its Mediterranean climate, wineries, and nature. It is a primarily suburban area with a population of about 361,000. It offers more affordable living accommodations than the cities of San Francisco and San Jose.

History

The

Ohlone The Ohlone, formerly known as Costanoans (from Spanish meaning 'coast dweller'), are a Native American people of the Northern California coast. When Spanish explorers and missionaries arrived in the late 18th century, the Ohlone inhabited the ...

tribe settled the area circa 2000 BC, particularly in the northern part of Pleasanton. In AD 1772, however, Spanish settlers involved with the nearby mission work at Mission San Jose restructured the Ohlone way of life. https://www.nps.gov/goga/learn/historyculture/upload/Chapter-9.pdf The area began to be developed when the

Gold Rush A gold rush or gold fever is a discovery of gold—sometimes accompanied by other precious metals and rare-earth minerals—that brings an onrush of miners seeking their fortune. Major gold rushes took place in the 19th century in Australia, New Z ...

ended. During this period, the area went from being marshland to agricultural.

Climate

The climate of the Tri-Valley is mild. Most rain falls in the winter. Snow almost never occurs, although it sometimes falls on the tops of surrounding mountains, especially Mt. Diablo. Summer days are in the 80s to over 100 °F, but nights are often cool. In winter, daytime temperatures reach the 50s and 60s, while nights are in the 30s and 40s, dipping on rare occasions into the 20s. Mean annual rainfall ranges from about in Livermore to in Alamo.

Transportation

The Tri-Valley is serviced by

WHEELS A wheel is a circular component that is intended to rotate on an axle bearing. The wheel is one of the key components of the wheel and axle which is one of the six simple machines. Wheels, in conjunction with axles, allow heavy objects to be ...

, operated by the Livermore Amador Valley Transit Authority (LAVTA), a bus agency that operates local bus service throughout Livermore, Pleasanton and Dublin, including service to Hacienda Business Park,

Lawrence Livermore National Laboratory Lawrence Livermore National Laboratory (LLNL) is a federal research facility in Livermore, California, United States. The lab was originally established as the University of California Radiation Laboratory, Livermore Branch in 1952 in response ...

, Las Positas College, Stoneridge Mall, the West Dublin/Pleasanton BART Station and the

Dublin/Pleasanton BART station Dublin/Pleasanton station is a Bay Area Rapid Transit (BART) station on the border of Dublin and Pleasanton in California. It is the eastern terminus of the Dublin/Pleasanton–Daly City line. It is also a major bus terminal served by six provid ...

. Two major highways, Interstates

580 __NOTOC__ Year 580 ( DLXXX) was a leap year starting on Monday (link will display the full calendar) of the Julian calendar. The denomination 580 for this year has been used since the early medieval period, when the Anno Domini calendar era b ...

and

680 __NOTOC__ Year 680 ( DCLXXX) was a leap year starting on Sunday (link will display the full calendar) of the Julian calendar. The denomination 680 for this year has been used since the early medieval period, when the Anno Domini calendar era ...

cross the Tri-Valley area. Interstate 580 runs east-west, connecting the area to the Central Valley to the east and the North Bay area to the west. Interstate 680 runs north-south, connecting the area to the South Bay area in the south, and the Concord-Walnut Creek area in the north. The two interstates cross on the border of Dublin and Pleasanton. The Tri-Valley area is also serviced by BART, offering service to the rest of the

San Francisco Bay Area The San Francisco Bay Area, often referred to as simply the Bay Area, is a populous region surrounding the San Francisco, San Pablo, and Suisun Bay estuaries in Northern California. The Bay Area is defined by the Association of Bay Area Gov ...

via two stops: West Dublin/Pleasanton and the

Dublin/Pleasanton Dublin/Pleasanton station is a Bay Area Rapid Transit (BART) station on the border of Dublin and Pleasanton in California. It is the eastern terminus of the Dublin/Pleasanton–Daly City line. It is also a major bus terminal served by six pro ...

terminus station. The West Dublin/Pleasanton Station opened in 2011, and was the first infill station on an existing line. In 2018, BART cancelled plans to extend the line to Livermore. However, the Tri-Valley San Joaquin Valley Regional Rail Authority is in the planning process for a rail connection between BART, ACE, and the San Joaquin Valley.

Economy

The Tri-Valley is home to the corporate headquarters of many companies, including 24 Hour Fitness,

Architectural Glass and Aluminum Architectural Glass and Aluminum (AGA) is a specialty glazing contractor located in the United States. Architectural Glass & Aluminum provides engineering, design, fabrication, installation, and assembly services for custom glazing systems, such ...

, Bay Area News Group, Blackhawk Network Holdings, CallidusCloud, Chevron, The Cooper Companies, Discovery Toys, Ellie Mae, GE Digital,

Gillig Corporation Gillig (formerly Gillig Brothers) is an American designer and manufacturer of buses. The company headquarters, along with its manufacturing operations, is located in Livermore, California (in the East Bay region of the San Francisco Bay Area) ...

Patelco Credit Union Patelco Credit Union is a member owned, not-for-profit credit union that serves Northern California, particularly the San Francisco Bay Area. Founded in 1936, it is one of the oldest and largest credit unions in the country. With more than $9 bi ...

, Prosoft Engineering, Ross Stores, SafeAmerica Credit Union,

Safeway Safeway is an American supermarket chain founded by Marion Barton Skaggs in April 1915 in American Falls, Idaho. The chain provides grocery items, food and general merchandise and features a variety of specialty departments, such as bakery, de ...

, Shaklee,

TriNet TriNet Group, Inc. is an American cloud-based professional employer organization for small and medium-sized businesses. TriNet administers payroll and health benefits and advises clients on employment law compliance and risk reduction, acting i ...

, Veeva Systems, Visioneer, WANdisco, The Wine Group
Product10x AcceleratorSalestable
and Workday. Major employment centers include Bishop Ranch and Hacienda Business Park.

and

Sandia National Laboratories Sandia National Laboratories (SNL), also known as Sandia, is one of three research and development laboratories of the United States Department of Energy's National Nuclear Security Administration (NNSA). Headquartered in Kirtland Air Force Bas ...

are also major employers in the region.

Recreation

The Tri-Valley features access to many recreational options, including

Alviso Adobe Community Park The Alviso Adobe Community Park is a park in the city of Pleasanton, California, United States. It is built around an adobe house constructed in 1854 by Francisco Alviso on the Rancho Santa Rita Mexican Land Grant. The Alviso Adobe is a rare s ...

Blackhawk Museum The Blackhawk Museum (founded 1988) consists of five distinct galleries in one facility located in Danville, California. It is best known for its significant collection of classic, rare, and unique automobiles. In addition to its gallery ''Classic ...

, Brushy Peak Regional Preserve,

Del Valle Regional Park Del Valle Regional Park is a part of the East Bay Regional Park District (EBRPD) in an unincorporated region of Alameda County, California, south of the city of Livermore.

Dublin Hills Regional Park Dublin Hills Regional Park covers in Alameda County, California, United States, west of the city of Dublin. It is part of the East Bay Regional Park District The East Bay Regional Park District (EBRPD) is a special district operating in Alameda ...

, Eugene O'Neill National Historic Site,

Forest Home Farms The Forest Home Farms is a municipal historic park located in San Ramon, California. In 1997, Ruth Quayle Boone bequeathed the land and all buildings on it to the City of San Ramon for use as a park and historical site in memory of her husband, ...

, Iron Horse Regional Trail, Las Trampas Regional Wilderness,

Little Hills Picnic Ranch Little Hills Picnic Ranch, sometimes called the "Ranch at Little Hills" or just "Little Hills" is a park in Contra Costa County, California near San Ramon. It is located at 18013 Bollinger Canyon Road and is adjacent to Las Trampas Regional Wild ...

, Livermore Valley Wine Country,

Morgan Territory Regional Preserve Morgan Territory Regional Preserve is a regional park in Contra Costa County, California. Located east of Clayton and north of Livermore, California, bordering on Mt. Diablo State Park, it is part of the East Bay Regional Park District (EBRPD). ...

, Mount Diablo State Park, Pleasanton Ridge Regional Park, Shadow Cliffs Regional Recreation Area an
The Wave Waterpark

References