State Route 4 - Wagon Trail Realignment Project


The State of California Department of Transportation (Caltrans), in coordination with Calaveras County Department of Public Works (County), is moving into the next phase of development for the State Route 4 Wagon Trail Realignment Project. Caltrans and the County have worked with the local property owners to develop alternative alignments that were environmentally conscious, cost effective, and meet current engineering standards. Through the environmental process, a preferred alignment was identified as meeting the necessary criteria and this alignment is now being advanced to the next stage of development, the final design and right of way.


The existing 6.5 mile segment of SR 4 between Copperopolis and Angels Camp consists of a non-engineered alignment with no adjacent shoulders. The alignment follows the existing rolling topography, resulting in numerous curves and limited sight distance, which reduces the operating speed of the roadway to approximately 25 to 35 miles per hour. In order to reduce accidents, improve operational efficiency, and relieve current and future traffic congestion, as well as to “close the gap” between improved roadway segments, the Calave ras County Department of Public Works, in coordination with Caltrans, is proposing to realign this segment of roadway in accordance with current design standards.


Funding is available through a variety of State and Federal sources including Public Lands Highway, the STIP Regional Improvement Program, and High Priority Projects. Funding for subsequent phases of work will be requested in accordance with the project’s programming schedule.


  • Complete NEPA & CEQA Studies– December 2014
  • Circulate Draft Environmental Document- April/June 2015
  • Hold Public Hearing- May 2015
  • Environmental Document Approval- December 2015
  • Final Project Report- December 2015


The California Department of Transportation (Caltrans) completed the Project Study Report (Project Development Support) [PSR(PDS)] evaluating the merits of the project in June 2001. The PSR was prepared to provide stakeholders with an understanding of the transportation deficiency as well as the scope and estimate of the project. This PSR (PDS) also provided a basis to obtain funding for the next phase of analysis. The PSR (PDS) does not necessarily provide a final solution for the project.


During this phase, the project team reviewed existing information, including topography, drainage, utility locations, access points, and other data and developed potential corridors that would accommodate the best alignment. Community workshops were held during this time to share the results of this work with the public and allow participants to provide feedback and comments.


During this phase of the project, the project team has performed a detailed analysis of the alignments and technical studies to analyze and refine the viable alternatives. As a result of these technical studies, a Project Report was prepared, which covers the technical engineering aspects of the project. In addition, a Environmental Document was also prepared, which describes the environmental impacts of the project. The Environmental Document was circulated for public comment in October 2015 and was approved in December 2016. The Project Report was approved in January 2017.


Construction plan sheets and specifications that describe how to build the project will be developed during this phase. In addition, right of way will be acquired, utility relocations (if any) will be coordinated, and permits will be obtained.


Once the construction plans and specifications are finalized, the necessary right of way is purchased, and the funding is in place, construction of the project will commence. Due to funding constraints, the project may be constructed in phases.




Philip Vallejo, Branch Chief
Caltrans District 6
Phone: (559) 445-5997

Grace Magsayo, Project Manager
Caltrans District 10
1976 Dr. Martin Luther King Jr. Boulevard
Stockton, CA 95205
Phone: (209) 948-7976


  • Why does the SR-4 Wagon Trail need to be realigned?
    In April 2001, Caltrans prepared a Project Study Report (Project Development Report) [PSR(PDS)] for the Wagon Trail Realignment Project that identified a need to make improvements to the roadway to improve safety and operations. SR-4 is a major access route from the San Joaquin Valley to the Sierra Nevada Mountains and is subject to high volumes of recreational vehicles. In addition, the growth (percentage wise) in Calaveras County is among the highest in the state. The accident rate within the project area is over twice the statewide average. This project will help to relieve current and future congestion and reduce accidents. It also improves system continuity.
  • What is the study area for realignment?
    Click here to view the Environmental Study Area map.
  • Why is the project study area so big?
    Regulatory Agencies require that studies be conducted within certain distances from the proposed project. The project study area has been identified based on the best information the design team has at this point in time. The project study area is likely to change as the alternatives are refined and preliminary biological studies are started.
  • How long is the realignment?
    Approximately 6.5 miles.
  • When will the roadway alignment be selected?
    Following the development of the Draft Project Report and Draft Environmental Document, Caltrans will solicit comments on the environmental document and hold a public hearing to determine the preferred alignment. As a result of this process, alignment 2 was selected as the preferred alignment.
  • Who approves the Documents for the Project?
    Caltrans, as the California Environmental Quality Act (CEQA) lead, approves the Documents; however, this occurs after public circulation, and completion of the environmental process.
  • My property is within the project study area, how will it be affected?
    Design Team members may need to walk your property to determine if there are any physical and/or environmental constraints associated with the property. This information will help to determine the impact and feasibility of the alternative alignments.
  • When will construction begin on the improvements?
    Depending on funding, construction could start 2 to 3 years following approval of the final environmental document.
  • How will construction affect the roadway access?
    Construction will be staged to mitigate disturbances to the public.
  • How can I get a copy of the Environmental document?
    Please click on the "Documents" tab to view the Environmental documents for the Wagon Trail Realignment Project.
  • How can I be notified of upcoming public meetings?
    To be notified of upcoming meets regarding the SR-4 Wagon Trail Realignment Project, please contact Scott Smith, Branch Chief, Caltrans District 6 at (559) 445-6172, or Grace Magsayo, PE, Project Manager, Caltrans District 10 at (209) 948-7976.
  • Who should I contact for more information?
    For more information or questions about the SR-4 Wagon Trail Realignment Project, contact Scott Smith, Branch Chief, Caltrans District 6 at (559) 445-6172, or Grace Magsayo, PE, Project Manager, Caltrans District 10 at (209) 948-7976.

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Contact Information

General Information:

Phone: (209) 948-7543
Public Information Office:
(209) 948-7977
Fax: (209) 948-3895
Email: District 10 PIO

Physical Address:

California Department of Transportation
District 10
1976 East Dr. Martin Luther King Jr. Blvd.
Stockton, CA 95205

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