Sonora Junction Shoulder Widening Project

Project Information

The Sonora Junction Shoulder Widening Project proposes to widen the existing paved shoulders on U.S. Highway 395 in Mono County from Burcham Flat Road to the south side of the junction with State Route 108. It proposes to install shoulder rumble strips, upgrade existing guardrails to Midwest Guardrail System, and correct the super-elevations of three substandard curves. This project is meant to enhance roadway safety and make the highway accessible to all modes of transportation. There are three “build” alternatives considered for this project. All three alternatives will require realigning Hot Creek about eight-tenths of a mile south of Little Walker Road to prevent the creek from undermining the highway. 

The preferred project alternative proposes to widen the highway shoulders to the standard 8-foot width. This alternative will also include approximately 1,050 linear feet of retaining walls, stabilizing cut slopes with anchored wire mesh, and extending or replacing existing culverts. Additionally, the preferred alternative calls for the installation of wildlife undercrossing structures in two locations and wildlife exclusionary fencing to connect the two structures. 

Draft Environmental Document

The draft environment document for the Sonora Junction Shoulder Widening Project is now available for public review. The document can be viewed here: Sonora Junction Shoulders DED. The public comment period closed on March 8, 2021.  

Project Cost

The construction cost is $14 million.

Project Schedule

Tentative Schedule (Subject to change):

  • Draft Environmental Document for Public Comment - February 2021
  • Final Environmental Document and Alternative Chosen - May 2021: 
  • Advertise - June 2023
  • Contract Approval - December 2023
  • Begin Construction - Spring/Summer 2024

For More Information Contact

Accessibility Assistance: Caltrans makes every attempt to ensure our documents are accessible. Due to variances between assistive technologies, there may be portions of this document which are not accessible. Where documents cannot be made accessible, we are committed to providing alternative access to the content. Should you need additional assistance, please contact us at (916) 654-2852 or visit https://dot.ca.gov/request-ada-compliant-documents.