Tri Delta Transit
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Tri Delta Transit, formally the Eastern Contra Costa Transit Authority, is a joint powers agency (JPA) of the governments of
Pittsburg Pittsburg may refer to: Places United States Cities, towns, townships and counties *Pittsburg, California * Pittsburg, Florida *Pittsburg, Kansas, Crawford County *Pittsburg, New Hampshire * Pittsburg, Oklahoma *Pittsburg, Texas *Pittsburg Coun ...
,
Antioch Antioch on the Orontes (; , ) "Antioch on Daphne"; or "Antioch the Great"; ; ; ; ; ; ; . was a Hellenistic Greek city founded by Seleucus I Nicator in 300 BC. One of the most important Greek cities of the Hellenistic period, it served as ...
, Oakley, Brentwood, and
Contra Costa County Contra Costa County (; ''Contra Costa'', Spanish language, Spanish for 'Opposite Coast') is a U.S. county, 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 ...
that provides
bus service Public transport bus services are generally based on regular operation of transit buses along a route calling at agreed bus stops according to a published public transport timetable. History of buses Origins While there are indications o ...
for the eastern area of Contra Costa County,
California California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...
, United States. Contra Costa County has four major public bus transportation services, divided geographically: three mostly serve destinations within the county, covering western (
WestCAT WestCAT is a public transportation service in western Contra Costa County (north of Alameda County, California, Alameda County). It is a service of the Western Contra Costa Transit Authority. Contra Costa County has four public bus transportation ...
), central (
County Connection The County Connection (officially, the Central Contra Costa Transit Authority, CCCTA) is a Concord-based public transit agency operating fixed-route bus and ADA paratransit (County Connection LINK) service in and around central Contra Costa Co ...
), and eastern (Tri Delta Transit) regions, and one (
AC Transit AC Transit is the main Public transport bus service, bus transit operator in the East Bay region of the San Francisco Bay Area, California. AC Transit is the third largest bus operator in California, serving the western portions of Alameda and C ...
) serves Bayside cities along the western edges of Contra Costa and Alameda counties. In , the system had a ridership of , or about per weekday as of . Tri Delta Transit local buses connect to the
BART Bay Area Rapid Transit (BART) is a rapid transit system serving the San Francisco Bay Area in California. BART serves List of Bay Area Rapid Transit stations, 50 stations along six routes and of track, including eBART, a spur line running t ...
rapid transit Rapid transit or mass rapid transit (MRT) or heavy rail, commonly referred to as metro, is a type of high-capacity public transport that is generally built in urban areas. A grade separation, grade separated rapid transit line below ground su ...
system at
Antioch Antioch on the Orontes (; , ) "Antioch on Daphne"; or "Antioch the Great"; ; ; ; ; ; ; . was a Hellenistic Greek city founded by Seleucus I Nicator in 300 BC. One of the most important Greek cities of the Hellenistic period, it served as ...
, Pittsburg Center, Pittsburg/Bay Point and Concord. In addition, Tri Delta Transit buses connect with
Amtrak The National Railroad Passenger Corporation, Trade name, doing business as Amtrak (; ), is the national Passenger train, passenger railroad company of the United States. It operates intercity rail service in 46 of the 48 contiguous United Stat ...
commuter rail services, including ''
San Joaquins The ''San Joaquins'' is a state-supported passenger train service operated by Amtrak in California's San Joaquin Valley. As of 2025, the service operates seven daily round trips between its southern terminus at Bakersfield and Stockton. Of the ...
'' and ''
Capitol Corridor The ''Capitol Corridor'' is a passenger train route in Northern California operated by Amtrak between San Jose, California, San Jose, in the Bay Area, and Auburn, California, Auburn, in the Sacramento Valley. The route is named after the two ...
''. Within the county, several Tri Delta Transit bus routes connect with County Connection and WestCAT.


History

The Eastern Contra Costa Transit Authority (ECCTA) JPA was formed in 1976 by the cities of Antioch, Brentwood, and Pittsburg, along with the County of Contra Costa. When Oakley was incorporated in 1999, the JPA was amended to admit Oakley on April 1, 2001. The Tri Delta Transit name was selected in May 1977 by the marketing committee of the ECCTA. Tri Delta Transit fixed route service began on June 6, 1977, celebrated by an inaugural bus starting from Antioch City Hall (10 a.m.), traveling to Oakley (10:30), Brentwood City Hall (11), Pittsburg, and ending in West Pittsburg (2 p.m.). For the first week, free rides were offered. Initial service was provided for two local routes in Antioch and Pittsburg, which connected with express bus service serving BART.
AC Transit AC Transit is the main Public transport bus service, bus transit operator in the East Bay region of the San Francisco Bay Area, California. AC Transit is the third largest bus operator in California, serving the western portions of Alameda and C ...
operated the service under contract until 1984, when it was transferred to a private operator, and ECCTA acquired its first buses; prior to that, AC Transit owned the buses it used for Tri Delta Transit. Some of the buses used in 1978 included 29-foot models, shortened from 35-foot buses at the AC Transit shops.
Dial-a-ride Demand-responsive transport (DRT), also known as demand-responsive transit, demand-responsive service,
US National Trans ...
on-demand transit services have been provided since 1979 using contracted private operators. ECCTA consolidated fixed route and on-demand services with a single operator when the contract with AC Transit was discontinued in 1984. In 1986, Laidlaw Transit, Inc. (later
First Transit First Transit was an American transportation company. Headquartered in Cincinnati, Ohio, it operated over 300 locations, carrying more than 350 million passengers annually throughout the United States in 41 states, Puerto Rico, Panama, India an ...
, now
Transdev Transdev, formerly Veolia Transdev, is a France-based international private-sector company which operates public transport. It has operations in 17 countries and territories as of November 2020. Transdev was formed on 3 April 2011 via the merg ...
) begin operating Tri Delta Transit. The ECCTA headquarters in Antioch was built in 1987, consolidating administration, operations, and maintenance at a single facility; expansions in 2004 provided additional space and bus parking.


Overview of fixed-route service

Tri Delta Transit operates in eastern Contra Costa County and has stops in Antioch, Oakley, Brentwood, Bay Point, Pittsburg, Martinez, and Concord. Tri Delta Transit operates local and express routes on weekdays and local routes on weekends and holidays.


Transfers

Intra-system transfer points for the majority of Tri Delta Transit's routes include: * Brentwood Park & Ride in Brentwood * Oakley Park & Ride in Oakley * Antioch BART station in Antioch * Pittsburg Center BART station in Pittsburg * Pittsburg/Bay Point BART station in Pittsburg * Los Medanos College in Pittsburg In addition to transfers within Tri Delta Transit and to BART, riders may transfer to neighboring and long-distance public transportation systems at other stations, including: *
Antioch–Pittsburg station Antioch–Pittsburg station is an unstaffed Amtrak station in Antioch, California and is the closest station to Pittsburg, California, which is located about west. It is served by ''San Joaquins'' trains operating on the branch between Oaklan ...
, via Routes 387 and 388 **
Amtrak The National Railroad Passenger Corporation, Trade name, doing business as Amtrak (; ), is the national Passenger train, passenger railroad company of the United States. It operates intercity rail service in 46 of the 48 contiguous United Stat ...
''
San Joaquins The ''San Joaquins'' is a state-supported passenger train service operated by Amtrak in California's San Joaquin Valley. As of 2025, the service operates seven daily round trips between its southern terminus at Bakersfield and Stockton. Of the ...
'' * Concord BART, via Route 201X (weekdays) **
County Connection The County Connection (officially, the Central Contra Costa Transit Authority, CCCTA) is a Concord-based public transit agency operating fixed-route bus and ADA paratransit (County Connection LINK) service in and around central Contra Costa Co ...
*
Martinez station 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 ...
, via Route 200X (weekdays) **
Amtrak The National Railroad Passenger Corporation, Trade name, doing business as Amtrak (; ), is the national Passenger train, passenger railroad company of the United States. It operates intercity rail service in 46 of the 48 contiguous United Stat ...
''
California Zephyr The ''California Zephyr'' is a Amtrak Long Distance, long-distance passenger train operated by Amtrak between Chicago, Illinois, Chicago and the San Francisco Bay Area (at Emeryville station, Emeryville), via Omaha, Nebraska, Omaha, Denver, Sa ...
'', ''
Coast Starlight The ''Coast Starlight'' is a Amtrak Long Distance, long-distance passenger train operated by Amtrak on the West Coast of the United States between Seattle and Los Angeles via Portland, Oregon, Portland and the San Francisco Bay Area. The train, ...
'', ''
San Joaquins The ''San Joaquins'' is a state-supported passenger train service operated by Amtrak in California's San Joaquin Valley. As of 2025, the service operates seven daily round trips between its southern terminus at Bakersfield and Stockton. Of the ...
'', and ''
Capitol Corridor The ''Capitol Corridor'' is a passenger train route in Northern California operated by Amtrak between San Jose, California, San Jose, in the Bay Area, and Auburn, California, Auburn, in the Sacramento Valley. The route is named after the two ...
'' **
County Connection The County Connection (officially, the Central Contra Costa Transit Authority, CCCTA) is a Concord-based public transit agency operating fixed-route bus and ADA paratransit (County Connection LINK) service in and around central Contra Costa Co ...
**
WestCAT WestCAT is a public transportation service in western Contra Costa County (north of Alameda County, California, Alameda County). It is a service of the Western Contra Costa Transit Authority. Contra Costa County has four public bus transportation ...


Route list

Tri Delta Transit operates sixteen bus routes on weekdays, serving the cities of Bay Point, Pittsburg, Antioch, Oakley, and Brentwood, with one route each connecting to Concord (201X) and Martinez (200X). Most routes parallel the
San Joaquin River The San Joaquin River ( ; ) is the longest river of Central California. The long river starts in the high Sierra Nevada and flows through the rich agricultural region of the northern San Joaquin Valley before reaching Suisun Bay, San Francis ...
, running east and west; routes designated as "express" (200X, 201X, 202X, and 300X) are designed with fewer stops and operate primarily during commute hours with limited mid-day service. Several routes share the same terminal points, but take different paths to provide service to communities both north and south of
California State Route 4 State Route 4 (SR 4) is a state highway in the U.S. state of California, routed from Interstate 80 in the San Francisco Bay Area to State Route 89 in the Sierra Nevada. It roughly parallels the Sacramento-San Joaquin River Delta, a popular ...
. For example 380, 387, 388, and 390 all provide service between the Pittsburg/Bay Point and Antioch BART stations, with 388 continuing on to the Antioch Medical Center. On the weekends and holidays, Tri Delta Transit operates six routes, which are a subset of five weekday routes and one additional route (395) that operates exclusively on weekends, throughout the ECCTA service area including the aforementioned cities with the exceptions of Concord and Martinez. The five routes that operate all week are longer, local routes which duplicate coverage of the shorter weekday-only bus routes. ;Notes


References


External links

*
Tri Delta Transit routes and descriptions
{{San Francisco Bay Area Public Transit, state=
California California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...
Bus transportation in California Public transportation in Contra Costa County, California Public transportation in Alameda County, California 1977 establishments in California Government agencies established in 1977