District 12 - Orange County

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Check Caltrans QuickMap for road closures due to potential flooding and mudslides during and after rainstorms, especially in areas affected by wildfires.

Established by the California State Legislature in 1988, Caltrans District 12 encompasses the entirety of Orange County. The jurisdictional boundaries of the District encompass a metropolitan area of 794 square miles, including 34 cities and 3.17 million people (as of 2015), and is crisscrossed by 17 state highway routes.

  • Read more about District 12

    The transportation system in California is one of the state’s greatest assets, unmatched in size, capacity, and convenience to the traveling public. The California Department of Transportation (Caltrans) is the public agency responsible for designing, building, operating and maintaining California’s state highway system, which consists of freeways, highways, expressways, toll roads and the area between the road and property line.

    Caltrans is subdivided into twelve business units called Districts that form the geographic whole of California. Each District has jurisdictional responsibility related to a county or a group of counties and is led by a District Director who is authorized by State law to carry out responsibilities related to state highways within the District. That delegation of authority is from the Caltrans Director in Sacramento, a statutory state government officer who is appointed by the governor and confirmed by the state senate.

    To provide for the transportation needs of the traveling public, District 12 maintains and operates 279 route miles of highway and 226 directional miles of full time High Occupancy Vehicle (HOV) or carpool lanes, one of the largest HOV lane networks in California. The revenue that funds Caltrans is the fuel tax collected on fuel sales.

    The revenue is distributed by mathematical formulas--some set by state law, some by Caltrans’ policy. District 12’s annual budget is determined by those formulas and with dollars used to fund expenses related to office facilities, payroll and benefits, capital construction and equipment.

Alerts / Projects / Hearings / Environmental Reports

Please select the route shield for Commuter Alerts, Project Information and Environmental Reports

I-405 Alerts

I-405 News / Projects

I-405 Environmental


SR-55 Alerts

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SR-55 Environmental


SR-73 Alerts

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SR-73 Environmental

SR-74 Alerts

SR-74 News / Projects

SR-74 Environmental

SR-90 Alerts / News / Projects

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SR-90 Recent Projects

SR-91 Alerts

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SR-91 Recent Projects

SR-91 Environmental



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SR-133 Alerts

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SR-133 News / Project

SR-133 Environmental


What's Happening in District 12


Other News:

A Look at District 12

Travel Conditions


Check Current Highway Conditions

You can also call 1-800-427-7623 for current highway conditions.

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Statewide Alerts and Other Information