About TRANSPLAN

The TRANSPLAN Committee coordinates the regional transportation interests of the communities in the cities of Antioch, Brentwood, Oakley and Pittsburg, and eastern Contra Costa County.

The five member governments of TRANSPLAN include the Cities of Antioch, Brentwood, Oakley and Pittsburg, and Contra Costa County. Contra Costa County governs the unincorporated East County communities of Bay Point, Bethel Island, Byron, Discovery Bay and Knightsen.

People & Mission

Meetings

Upcoming Meeting Dates Will be announced soon

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East County Action Plan and Countywide Transportation Plan Updates

East County Action Plan and Countywide Transportation Plan Updates

The East County Action Plan was updated in 2023. The updated East County Action Plan will feed into the Countywide Transportation Plan (CTP) Update. CTP Update process is anticipated to be completed by 2026.

East County Action Plan & Countywide Transportation Plan
State Route 239 Project

State Route 239 Project

The proposed State Route 239 Project will provide a new four-lane highway from State Route 4 at Marsh Creek Road in Contra Costa County to Interstate 580 in Alameda County or Interstate 205 in San Joaquin County.

State Route 239
Mokelumne Trail Bicycle/Pedestrian Overcrossing Project

Mokelumne Trail Bicycle/Pedestrian Overcrossing Project

The Mokelumne Trail Bicycle/Pedestrian Overcrossing project constructed a pedestrian and bicycle bridge that spans Highway 4 – closing a gap along the Mokelumne Trail, and providing safe access for bicyclists and pedestrians. The overcrossing was opened to pedestrians and bicyclists in March 2024.

Mokelumne Trail Bicycle/Pedestrian Overcrossing

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