Sonora Junction Shoulder Widening Project

This project proposes to widen the existing paved shoulders on US 395 from Burcham Flat Road to the south side of the US 395/SR 108 intersection (postmiles 91.6-93.4). It proposes to install shoulder rumble strips, upgrade existing guardrails, and correct the super-elevations of three substandard curves. There are three “build” alternatives considered for this project. All three alternatives will require realigning Hot Creek at postmile 92.35 to prevent the creek from undermining the highway.

  1. Alternative 1 proposes to widen highway shoulders to 4 ft throughout the project limits.
    • Approximately 400 linear feet of retaining walls will be needed.
    • Non-escalated estimated construction cost $5,053,000.
  2. Alternative 2 proposes to widen the shoulders variably from 4 ft (postmiles 92.4 to 92.9) to 8ft throughout the rest of the project area. This will avoid widening into some portions of Hot Creek.
    • Approximately 900 linear feet of retaining walls will be needed.
    • Cut slopes will be stabilized with anchored wire mesh to reduce rockfall.
    • An estimated 6 culverts will be extended or replaced. Temporary stream diversions will be necessary at these locations.
    • Non-escalated estimated construction cost $9,100,000.
  3. Alternative 3 proposes to widen the highway shoulders to the standard 8ft width.
    • Approximately 1050 linear feet of retaining walls will be needed.
    • Cut slopes will be stabilized with anchored wire mesh to reduce rockfall.
    • At least 6 culverts will be extended or replaced. Temporary stream diversions will be necessary at these locations.
    • Non-escalated estimated construction cost $10,381,000.

Benefits

This project is proposed to enhance roadway safety and make the highway accessible to all modes of transportation. The existing highway shoulders in this area are 2ft wide; standard width is 8ft.

Project Schedule

  • November 2020: Draft Environmental Document for Public Comment
  • May 2021: Final Environmental Document and Alternative Chosen
  • June 2021: Begin Right of Way Acquisition and Permits
  • February 2023: Final Plans and Specifications
  • Spring/Summer 2024: Begin Construction

Current Status

Caltrans is working on the initial design and environmental assessment phase of the project. Early discussions with regulatory agencies is occurring to define potential environmental impacts and ensure compliance with applicable environmental regulations.

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