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Tri Delta Transit
ParentEastern Contra Costa Transit Authority
Founded1977 (1977)
Headquarters801 Wilbur Ave, Antioch, California, United States
LocaleEast Contra Costa County, California
Service typebus service, paratransit
Routes17 weekday, 6 weekend[1]
Stopsapproximately 650[1]
Fleet
[1]
Daily ridership4,500 (weekdays, Q4 2024)[2]
Annual ridership1,348,100 (2024)[3]
OperatorTransdev[1]
Websitetrideltatransit.com

Tri Delta Transit, formally the Eastern Contra Costa Transit Authority, is a joint powers agency (JPA) of the governments of Pittsburg, Antioch, Oakley, Brentwood, and Contra Costa County that provides bus service for the eastern area of Contra Costa County, California, United States.[1] In 2024, the system had a ridership of 1,348,100, or about 4,500 per weekday as of the fourth quarter of 2024.

Tri Delta Transit local buses connect to the BART rapid transit system at Antioch, Pittsburg Center, Pittsburg/Bay Point and Concord. In addition, Tri Delta Transit buses connect with Amtrak commuter rail services, including San Joaquins and Capitol Corridor. Within the county, Tri Delta Transit buses connect with other local bus services, including County Connection (serving central Contra Costa County) and WestCAT (western Contra Costa County).

History

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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 in 2000.[4]: 1  The Tri Delta Transit name was selected in May 1977 by the marketing committee of the ECCTA.[5]

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.[6] Initial service was provided for two local routes in Antioch and Pittsburg, which connected with express bus service serving BART. AC Transit operated the service under contract until 1984, when it was transferred to a private operator,[4]: 1  and ECCTA acquired its first buses; prior to that, AC Transit owned the buses it used for Tri Delta Transit.[7] Some of the buses used in 1978 included 29-foot models, shortened from 35-foot buses at the AC Transit shops.[8]

Dial-a-ride 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.[7]

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.[4]: 1 

Overview of fixed-route service

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Tri Delta Transit Gillig BRT in Pittsburg.

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

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Intra-system transfer points for the majority of Tri Delta Transit's routes include:

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:

Route list

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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, 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.[9] 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.[10]

Tri Delta Transit bus routes[10]
Route Westbound Terminal Eastbound Terminal Weekend service
200X Martinez station (Amtrak) Pittsburg/Bay Point BART No
201X Concord BART No
202X Brentwood Park & Ride[a] No
300X[b] Antioch BART Brentwood Park & Ride No
379[c] Antioch Medical Center No
380 Pittsburg/Bay Point BART Antioch BART Yes
381 Pittsburg Marina Los Medanos College Yes
383 Wilbur and Cavallo Rd[d] Blue Goose Park No
384 Antioch BART Brentwood Park & Ride No
385 No
387 Pittsburg/Bay Point BART Antioch BART No
388 Antioch Medical Center Yes
389 Pittsburg/Bay Point BART[e] Yes
390[f] Pittsburg/Bay Point BART Antioch BART No
391 Pittsburg Center BART Brentwood Park & Ride Yes
395 Antioch BART The Streets of Brentwood Yes (no weekdays)[g]


Discontinued Tri Delta Transit bus routes
Route Westbound Terminal Eastbound Terminal Weekend service
70[12] 3rd & Marina[h] No
200[13] Martinez station (Amtrak) Wilbur & Cavallo Rd[d] No
392[14] Pittsburg/Bay Point BART Brentwood Park & Ride Yes (no weekdays)[g]
393[15] Mariners Cove Dr & Pacifica Ave Hillcrest Park & Ride Yes (no weekdays)[g]
709[i] Pittsburg/Bay Point BART Antioch BART No
Delta Express[18] Hillcrest Park & Ride Lawrence Livermore National Laboratory No
Notes
  1. ^ Operates loop service via Los Medanos College Brentwood Center
  2. ^ Designed for traditional commute, operating westbound in the mornings and eastbound in the afternoons
  3. ^ Operates during school days for Antioch Unified School District[11]
  4. ^ a b Tri Delta Transit headquarters
  5. ^ Operates loop service around via Bay Point
  6. ^ Operates during commute hours
  7. ^ a b c Operates exclusively on weekends and holidays, no weekday service[11]
  8. ^ Operates loop service in Pittsburg via Buchanan and Harbor
  9. ^ "Early Bird Express" operated as a westbound-only route by Tri Delta Transit before regular weekday eBART service starts at 5 a.m.;[16] eliminated starting from June 10, 2024.[17]

References

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  1. ^ a b c d e "About Us". Tri Delta Transit.
  2. ^ "Transit Ridership Report Third Quarter 2024" (PDF). American Public Transportation Association. November 20, 2024. Retrieved November 23, 2024.
  3. ^ "Transit Ridership Report Fourth Quarter 2024" (PDF). American Public Transportation Association. February 19, 2025. Retrieved February 25, 2025.
  4. ^ a b c Short Range Transit Plan 2020 – 2029 (PDF) (Report). Eastern Contra Costa Transit Authority. August 26, 2020.
  5. ^ "East CC Bus Plan Named". Contra Costa Times. May 25, 1977. p. 12. Retrieved 13 March 2025.
  6. ^ "Events Set To Herald Bus Lines". Contra Costa Times. June 5, 1977. p. 54. Retrieved 13 March 2025.
  7. ^ a b "Inside Tri Delta Transit". Eastern Contra Costa Transit Authority. Archived from the original on April 6, 2001.
  8. ^ "East County's Styled Buses". Contra Costa Times. August 24, 1978. p. 13. Retrieved 13 March 2025.
  9. ^ "Local Bus". Tri Delta Transit. Retrieved 19 July 2023.
  10. ^ a b "System Map". Tri Delta Transit. August 2024. Retrieved 7 March 2025.
  11. ^ a b "Holiday Schedule". Tri Delta Transit. Retrieved 7 March 2025.
  12. ^ "Route 70". Eastern Contra Costa Transit Authority. Archived from the original on March 3, 2001.
  13. ^ "Route 200". Eastern Contra Costa Transit Authority. Archived from the original on May 24, 2001.
  14. ^ "Route 392". Eastern Contra Costa Transit Authority. Archived from the original on May 31, 2001.
  15. ^ "Route 393". Eastern Contra Costa Transit Authority. Archived from the original on June 1, 2001.
  16. ^ "Early Bird Express". Bay Area Rapid Transportation District. August 12, 2024. Retrieved 7 March 2025.
  17. ^ "Early Bird Express chart" (PDF). Bay Area Rapid Transportation District. April 28, 2024. Retrieved 7 March 2025.
  18. ^ "Delta Express". Eastern Contra Costa Transit Authority. Archived from the original on June 2, 2001.
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