California Aqueduct Bridge Replacement

Project Description

The California Department of Transportation (Caltrans) proposes to replace California Aqueduct Bridge Number 50-0323 on State Route 166. The project is in Kern County east of Maricopa, 2.6 miles east of Old River Road and 5 miles west of Interstate 5. There are two build alternatives — Alternative 8 and the South Alignment Alternative — and a no-build alternative. Under the build alternatives, a new bridge would be built that would span the entire California Aqueduct and the existing structure would be removed.


Graphic of project location map


Project Benefits


The purpose of this project is to replace the existing 50-year-old bridge with a new bridge that will meet current Caltrans standards and be structurally sound.


The existing bridge is deficient for the following reasons:

  • The bridge piers are settling into the ground, resulting in cracks on the bottom surface of the existing bridge structure
  • The bridge deck is sagging and rotating, indicating that the foundation is unstable, resulting in insufficient structural integrity
  • Because of the bridge’s insufficient structural integrity, the bridge may continue to deteriorate and become structurally unsound


Estimated Funding Breakdown

Funding Source Funding Amount
Local Not Applicable
State Alternative 8: $5,400,000
South Alignment Alternative: $3,700,000
Federal Alternative 8: $41,300,000
South Alignment Alternative: $28,400,000
Construction Cost Alternative 8: $46,700,000
South Alignment Alternative: $32,100,000


Proposed Project Schedule

Process Date
Final environmental document to be completed Summer 2022
Right-of-way acquisition to be completed Summer 2023
Design to be completed Summer 2023
Advertise Fall 2023
Construction to begin Spring 2024
Construction to be completed Fall 2025


Project Contact

Juergen Vespermann, Senior Environmental Planner
Phone:  (559) 832-0051

Scott Friesen, Project Manager
Phone:  (559) 960-2238

District 6 Public Information Office
Phone:  (559) 444-2409




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.