Carbon Canyon Road

California highways and freeways are the responsibility of the State of California and are managed by the California Department of Transportation (Caltrans). State Route 142 (SR-142), which includes Carbon Canyon Road, falls under the jurisdiction of Caltrans. 

Project Description

Caltrans is performing work along Carbon Canyon Road to extend the westbound entrance merging lane number 2 at the Chino Hills Parkway intersection. The project will lengthen the westbound #2 lane section of Carbon Canyon Road by 1000 feet and modify the traffic signal to improve traffic flow from the Chino Hills Parkways left-turn lanes.

Project Fact Sheet (PDF)


The project work area includes work along westbound Carbon Canyon Road from 0.5 miles north of Feldspar Drive to Chino Hills Parkway.

Construction Activity

Work begins September 27 and will take place Mondays through Fridays, with occasional nighttime work. 

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Construction Timeframe

Caltrans estimates the project to be completed by December 8, 2023.

Point of Contact:

Mariam Rojo, Caltrans Public Information Officer
Phone: (909) 383-1910 or (951) 232-4268