Interstate 5 Sperry Road Interchange

Project Description

The California Department of Transportation, in conjunction with Stanislaus County and the City of Patterson, proposes to construct improvements to the Interstate 5(I-5)/Sperry Road interchange, in Stanislaus County approximately 2.5 miles west of the City of Patterson.  The City of Patterson is sponsoring the project and will be the lead for the design phase.  The project would improve operations, enhance safety and increase the capacity of the interchange to accommodate the anticipated demand associated with recent and planned development adjacent to the interchange and in the City of Patterson.

The project proposes to upgrade the I-5/Sperry Road interchange. Improvements would include widening Sperry Road from 2-lane to 4-lane and widening or reconstructing the on- and off-ramps. Sperry Road will be widened in each direction between Del Puerto Canyon Road and the Delta-Mendota Canal. Typically, the widening along Sperry Road is approximately 18 feet. However, additional widening is necessary at the approaches to the ramp intersections as well as the Rogers Road intersection to provide the required turn pockets.

Retaining walls will be constructed along both sides of Sperry Road under I-5, and the Sperry Road Bridge at the California Aqueduct will be widened to accommodate the wider roadway. Excavation will be required to construct the pavement structural sections and retaining walls needed to facilitate the roadway widening under the freeway. Existing tall embankment slopes will need to be widened along Sperry Road, east of the interchange.


Project Benefits


  • Increase the capacity of the interchange to accommodate existing and future traffic demands
  • Improve operations and the movement of goods
  • Enhance safety


Improvements to the interchange are necessary to meet the increasing traffic demand associated with continued and planned commercial and industrial growth in the City of Patterson. Currently, the southbound off-ramp intersection operates at level of service (LOS) F in the PM peak period. By 2040, both ramp intersections are predicted to operate at LOS F during both the morning and afternoon peak traffic.  Additionally, the project is anticipated to enhance the safety of motorists using this interchange, particularly the southbound off-ramp, which has an elevated incidence of vehicle accidents, as indicated in Section 4C Collision Analysis of this report.


Project Cost/Programmed

 Programed Project Cost Capital $ Support $
Project Approval & Environmental Document $0 $0
Plans, Specifications, & Estimates $0 $0
Right of Way $179,000 $0
Construction $2,015,000 $0


Projected Cost as of (October 2022) Planned $ Expended $
Project Approval & Environmental Document $1,038,000 $737,000
Plans, Specifications, & Estimates $1,750,000 $0
Right of Way $179,000 $0
Construction $2,015,000 $0


Current Schedule

 Process Date
Project Study Report (M010) 9/22/20 (Actual)
Project Approval & Environmental Document (M200) To Be Determined
Right of Way Certification (M410) Winter 2023
Ready to List (M460) Winter 2023
Approved Construction Contract (M500) To Be Determined
Project Completion (M600) To Be Determined


Project Status

Project is currently in Plans, Estimates, and Specifications (PS&E) phase.


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.