Tri Delta Transit

Tri Delta Transit, formally the Eastern Contra Costa Transit Authority, is a joint powers agency 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] Tri Delta Transit local buses connect to the BART rapid transit system at Pittsburg/Bay Point and Concord. Tri Delta Transit buses also connect with County Connection bus service, WestCAT bus service, Delta Breeze bus service and Amtrak at shared bus stops. In 2022, the system had a ridership of 1,045,300, or about 4,500 per weekday as of the second quarter of 2023.

Tri Delta Transit
ParentEastern Contra Costa Transit Authority
Founded1977 (1977)[1]
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, Q2 2023)[2]
Annual ridership1,045,300 (2022)[3]
OperatorTransdev[1]
Websitetrideltatransit.com

Overview of fixed-route service
Tri Delta Transit bus 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/holidays.

Major transfer points for the majority of Tri Delta Transit's routes include:

Route list

Tri Delta Transit operates seventeen bus routes. On weekdays, all of them are operated throughout the cities of Concord, Bay Point, Pittsburg, Antioch, Oakley, Brentwood, and Martinez. On weekends, six of them are operated throughout the aforementioned cities except Concord and Martinez. They're intended to be the longer routes to cover the many segments of the weekday-only bus routes. Even though most of the routes have the same terminus, various of them have their own ways of reaching their terminus.[4]

All weekday routes
RouteWestbound TerminalEastbound Terminal
200XMartinez station (Amtrak)Pittsburg/Bay Point BART
201XConcord BART
202XBrentwood Park & Ride (loop back via Los Medanos College Brentwood Center)
300XAntioch BARTBrentwood Park & Ride
379Antioch Medical Center
380Pittsburg/Bay Point BARTAntioch BART
381Pittsburg MarinaLos Medanos College
383Wilbur and Cavallo Rd (Tri Delta Transit HQ)Blue Goose Park
384Antioch BARTBrentwood Park & Ride
385
387Pittsburg/Bay Point BARTAntioch BART
388Antioch Medical Center
389Pittsburg/Bay Point BART (loop around via Bay Point)
390Pittsburg/Bay Point BARTAntioch BART
391Pittsburg Center BARTBrentwood Park & Ride
395Antioch BARTThe Streets of Brentwood
709Pittsburg/Bay Point BARTAntioch BART
All weekend routes
380Pittsburg/Bay Point BARTAntioch BART
381Pittsburg MarinaLos Medanos College
388Pittsburg/Bay Point BARTAntioch Medical Center
389Pittsburg/Bay Point BART (loop around via Bay Point)
391Pittsburg Center BARTBrentwood Park & Ride
395Antioch BARTStreets of Brentwood

Fleet roster
Fleet Number(s)Build
date		ManufacturerModelEngineTransmissionNotes
0992-0999GilligBRT 40'
(G27D102N4)		Cummins ISLAllison B400R2009 models
1375–13992012GilligBRT 40'Cummins ISL9Allison B400R2013 models
1680–16992016GilligBRT 40'Cummins ISL9Allison B400RReplaced 2001 Gillig Phantoms
1893–18972018GilligBRT 40'Cummins L9Voith D864.6Delivered in June 2018
1898–18992018Proterra, Inc.Catalyst BE40Battery electric bus
1891–18922018BYD AutoK9Battery electric bus
239?–23992023GilligBRT 40'Cummins L9UnknownDelivered in mid-2023
23??–239?2023GilligLow Floor 40'Battery electric bus

References
  1. "About Us". Tri Delta Transit.
  2. "Transit Ridership Report Second Quarter 2023" (PDF). American Public Transportation Association. September 13, 2023. Retrieved September 21, 2023.
  3. "Transit Ridership Report Fourth Quarter 2022" (PDF). American Public Transportation Association. March 1, 2023. Retrieved March 29, 2023.
  4. "Local Bus". Tri Delta Transit. Retrieved 19 July 2023.
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