Tri Delta Transit

Parent	Eastern Contra Costa Transit Authority
Founded	1977 (1977)[1]
Headquarters	801 Wilbur Ave, Antioch, California, United States
Locale	East Contra Costa County, California
Service type	bus service, paratransit
Routes	17 weekday, 6 weekend[1]
Stops	approximately 650[1]
Fleet	62 transit bus 30 paratransit 6 med vans 8 microtransit Tri MyRide [1]
Daily ridership	4,800 (weekdays, Q3 2023)[2]
Annual ridership	1,045,300 (2022)[3]
Operator	Transdev[1]
Website	trideltatransit.com

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 4,800 per weekday as of the third quarter of 2023.

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/holidays.

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

• Brentwood Park & Ride in Brentwood
• Oakley Park & Ride
• Antioch BART station in Antioch
• Pittsburg Center BART station in Pittsburg
• Pittsburg/Bay Point BART station in Pittsburg
• Los Medanos College in Pittsburg

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]

Fleet roster