TEHAMA COUNTY, Calif. — Caltrans will begin the Champlin Slough Bridge Replacement project starting on May 23, which will completely replace the existing bridge structure located just south of Los Molinos on State Route 99 in Tehama County.

The project also includes new guard railing, and the addition of numerous safety features.

Preliminary work will begin on May 23, with nightly one-way traffic control. SR 99 will be fully closed to through traffic tentatively on June 6th for seven weeks. Please see the attached detour map to plan your commute/trips accordingly.

The $7.5 million project includes 90 working days, with 40 calendar days requiring the SR-99 closure. The entire project is expected to be completed by mid-August 2022.

To stay up to date on highway projects, please follow us on Facebook and Twitter. Project information can also be found on the District 2 webpage.

The public can also call 530-225-3426 during working hours or send an email to This email address is being protected from spambots. You need JavaScript enabled to view it..

Updated highway conditions for California can be found on QuickMap and on One-Stop-Shop for the Western U.S.

Contractor Viking Construction Co. Inc., North Region Construction and Caltrans District 2 thank the traveling public and local communities for their patience during the construction of the project.