Contra Costa County is a county located in the U.S. state of California, in the East Bay of the San Francisco Bay Area. As of the 2020 United States Census, the population was 1,165,927. The county seat is Martinez. It occupies the northern portion of the East Bay region of the San Francisco Bay Area and is primarily suburban. The county's name refers to its position on the other side of the bay from San Francisco. Contra Costa County is included in the San Francisco–Oakland–Berkeley, CA Metropolitan Statistical Area.
Martinez is a city and the county seat of Contra Costa County, California, United States, in the East Bay region of the San Francisco Bay Area. Located on the southern shore of the Carquinez Strait, the city's population was 37,287 at the 2020 census. The city is named after Californio ranchero Ygnacio Martínez, having been founded on his Rancho El Pinole. Martinez is known for its historic center and its waterfront.
Interstate 680 (I-680) is a north–south auxiliary Interstate Highway in Northern California. It curves around the eastern cities of the San Francisco Bay Area from San Jose to I-80 at Fairfield, bypassing cities along the eastern shore of San Francisco Bay such as Oakland and Richmond while serving others more inland such as Pleasanton and Concord.
The County Connection is a Concord-based public transit agency operating fixed-route bus and ADA paratransit service in and around central Contra Costa County in the San Francisco Bay Area. Established in 1980 as a joint powers authority, CCCTA assumed control of public bus service within central Contra Costa first begun by Oakland-based AC Transit as it expanded into suburban Contra Costa County in the mid-1970s. In 2023, the system had a ridership of 2,661,400, or about 9,900 per weekday as of the fourth quarter of 2023.
The John Muir National Historic Site is located in the San Francisco Bay Area, in Martinez, Contra Costa County, California. It preserves the 14-room Italianate Victorian mansion where the naturalist and writer John Muir lived, as well as a nearby 325-acre tract of native oak woodlands and grasslands historically owned by the Muir family. The main site is on the edge of town, in the shadow of State Route 4, also known as the "John Muir Parkway."
Martinez station is an Amtrak passenger train station in Martinez, California, United States. Located at the west end of downtown Martinez, the station has one side platform and one island platform, which serve three of the four tracks of the Union Pacific Railroad Martinez Subdivision. It is served by the daily California Zephyr and Coast Starlight long-distance trains, five daily round trips of the San Joaquin corridor service, and fifteen daily round trips of the Capitol Corridor service. Martinez is also served by Amtrak Thruway buses plus County Connection, Tri-Delta Transit, and WestCAT local buses.
Los Encinos State Historic Park is a state park unit of California, preserving buildings of Rancho Los Encinos. The park is located near the corner of Balboa and Ventura Boulevards in Encino, California, in the San Fernando Valley. The rancho includes the original nine-room de la Ossa Adobe, the two-story limestone Garnier building, a blacksmith shop, a natural spring, and a pond. The 4.7-acre (1.9 ha) site was established as a California state park in 1949.
Alhambra Creek is a stream in Contra Costa County, in the East Bay region of the San Francisco Bay Area in northern California.
Rancho Las Juntas was a 13,293-acre (53.79 km2) Mexican land grant in present day Contra Costa County, California given in 1844 by Governor Manuel Micheltorena to William Welch. The name Las Juntas translates as "the Crossroads". The grant was located between Ygnacio Martinez’ Rancho El Pinole and Salvio Pacheco’s Rancho Monte del Diablo, and included northwestern Walnut Creek, all of Pleasant Hill, and the eastern portion of Martinez. The original borders of the claim were defined as the straits to the north, "Las Juntas" to the south, the Walnut creek to the east, the Reliz ridge to the west, and, to the northwest, the Alhambra creek.
Tuscan Springs are a group of springs in the U.S. state of California. Tuscan Springs was named for the fact its borax-impregnated waters were chemically similar to the springs of Tuscany, in Italy.
Bradford Island is a 2,172-acre (879 ha) island of the Sacramento–San Joaquin River Delta, in Contra Costa County, California, United States. Bradford Island is inaccessible by roads, and is served by a ferry across the False River from nearby Jersey Island. Approximately 48 people lived on the island as of 2020. Other uses of land include wheat farming, cattle grazing, and natural gas extraction.
Kimball Island is a small island in the Sacramento–San Joaquin River Delta. It is located in Sacramento County, California, in the United States. Since its discovery, it has been used to grow barley, farm fish, cultivate cannabis, and as residential land. Currently, however, it is uninhabited; since 2000, it has been left to "forever be a wetland habitat", and is sometimes used as a fishing spot.
Mallard Island is a small island in Suisun Bay, at the confluence of the Sacramento and San Joaquin rivers. It is part of Contra Costa County, California. Its coordinates are 38°02′31″N121°55′07″W, and the United States Geological Survey measured its elevation as 3 ft (0.91 m) in 1981. It appears in a 1953 USGS map of the area.
The Palm Tract is an island in the Sacramento–San Joaquin River Delta. It is part of Contra Costa County, California. It, along with Orwood Tract to the south, are managed by Reclamation District 2024. Its coordinates are 37°57′14″N121°35′22″W, and the United States Geological Survey measured its elevation as 10 ft (3.0 m) in 1981. It appears on 1913 and 1952 United States Geological Survey maps of the area.
Louis Lorenz Stein Jr. was an American pharmacist, California East Bay historian and archivist. He is best known for founding the Arlington Pharmacy in Kensington, California and the pharmacy museum at Columbia State Historic Park and for donating collections of historical materials to various California historical societies and museums.
Gaviota Hot Springs is a geothermal feature in Santa Barbara County, California, United States. The two pools are accessible from the Gaviota Peak trail in Gaviota State Park. Gaviota Hot Springs is sometimes called Las Cruces Hot Springs or Sulphur Springs. The hot springs lie within the Hot Springs Creek watershed, near the junction of U.S. Route 101 and California State Route 1.
Veronica Springs, also Veronica Medicinal Springs, was a cluster of natural springs along Arroyo Burro creek in Santa Barbara County, California, United States. Veronica spring water was not a therapeutic spa water or a table water but a medicinal mineral water with high magnesium levels. The waters had a yellowish tinge and a strongly purgative-laxative effect, and beginning around 1887, the water was bottled and sold as a health tonic. Veronica Water peaked as a brand in the 1910s. The springs were capped off in 1962.
Tolenas Springs is a group of natural carbonated-water soda springs in the hills of Solano County, California, United States. The springs emerge from a formation of travertine that has been intermittently quarried for building material. The springs are located on private property and are closed to the public.
Console Springs was a natural spring in Reche Canyon, Riverside County, California, United States. The waters were bottled for sale in the early 20th century.
El Granito Springs was a natural spring in the vicinity of present-day La Mesa in eastern San Diego County, California, United States. The springs were named for their location in a granite outcropping near the San Diego River.