State Route 4 Wagon Trail Realignment Project

Project Description

The State Route 4 Realignment Project will improve the segment of State Route 4 from Bonanza Mine Way to Stockton Road from 2.6 miles east of Copperopolis to about 1.6 miles west of the State Route 4/49 junction in Altaville (Angels Camp), post miles 10.3 to 16.4, a total of about 6 miles. The project will construct a new alignment with two standard 12-foot width lanes and 8-foot paved shoulders. The project would improve sight distance by increasing curve radii with the incorporation of longer, smoother curves. The project will be constructed in phases, and based on accident data, the 2-mile segment between Bonanza Mine Way and Appaloosa Road (Phase 1 – Westerly Segment) was identified to have the highest priority.


Project Benefits

Purpose and Need

To enhance safety, improve sight distance, and limit access to State Route 4, the Calaveras County Department of Public Works, in coordination with Caltrans and the Calaveras Council of Governments (CCOG), is proposing to move forward with a project to realign the segment of SR 4 between Angels Camp and Copperopolis.


Progress to Date

Caltrans initiated the SR-4 Wagon Trail Realignment Project, completing a Project Study Report/Project Development Support (PSR/PDS) document in April 2001. Subsequently, CCOG and Calaveras County led the effort to obtain project approval and environmental clearance for the project, resulting in the selection of a preferred alignment in December 2016. With an estimated construction cost exceeding $50,000,000, 


Project Schedule

Following is the anticipated schedule of project milestones specific to the western project segment:

  • Design of Western Segment Begins—Feb 2019
  • Complete surveys/geotechnical investigations—August 2019
  • Right-of-Way Appraisals/Acquisitions— 2020/2021
  • Construction (Pool Station to Appaloosa) —2021/2022



Funding is available through State and Federal sources including SHOPP funds, the STIP Regional Improvement Program, and High Priority Projects. Funding is currently secured for the following expenditures:

  • Design: Bonanza Mine Way to Appaloosa Road
  • Right of Way: Bonanza Mine Way to Appaloosa Road
  • Construction: Pool Station Road to Appaloosa Road

Funding for subsequent segments of the project will be requested in accordance with the project’s programming schedule.


Exhibits and Documents

Exhibits and documents prepared for the project to date can be viewed at the following website:


Project Contact

Caltrans District 10 - Public Information Office
Phone: (209) 948-7977


Title VI Information

The California Department of Transportation (Caltrans) assures that no person shall, on the basis of race, color, or national origin, be excluded from participation in, be denied the benefits of, or be otherwise subjected to discrimination under any program or activity receiving Federal financial assistance, as required by Title VI of the Civil Rights Act of 1964, as amended, the Civil Rights Restoration Act of 1987, and Federal Executive Order 12898 (Federal Actions to Address Environmental Justice in Minority Populations and Low-Income Populations).

Caltrans will make every effort to ensure nondiscrimination in all of its programs and activities, whether they are federally funded or not, and that services and benefits are fairly distributed to all people, regardless of race, color, or national origin. In addition, Caltrans will facilitate meaningful participation in the transportation planning process in a nondiscriminatory manner.