Caltrans District 10 map of repair and replacement of culverts and drainage systems in Tuolumne and Calaveras counties
Sonora, CA—A drainage rehabilitation project by Caltrans will repair and replace culverts and drainage systems in Tuolumne and Calaveras counties beginning next week and lasting through most of the summer.
The $2.5 million project was awarded to Wylatti Resource Management, Inc., out of the Mendocino area, and it aims to improve highway safety for travelers. The project will repair and replace 15 culverts in Calaveras County and 23 in Tuolumne County along Highways 12, 26, 108, and 120. Work begins on Wednesday, January 26, 2026, primarily during night shifts from 8 p.m. to 6 a.m., lasting about 120 working days, with completion expected sometime in August of this year.
“Alternating lane closures will be required for the safety of motorists, roadway workers, and equipment,” advised Caltrans officials.
Travelers may face up to 10-minute delays in some areas during the workday. Roadside message signs will also be in place to notify motorists of these changes. Additionally, the schedule may change due to traffic incidents, weather, or construction issues.
This post was last modified on 01/24/2026 11:28 am
Written by Tracey Petersen.
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