Interstate 5 Improvements

The proposed project is located in Stanislaus County on 0.6 mi (approx 3,157 ft) of Sperry Rd (also known as Sperry Ave) from west of I-5 (PM 15.8/15.9) to west of Rogers Rd. The proposed project would upgrade the I-5/Sperry Rd interchange, including widening Sperry Rd and widening/reconstructing the ramps. Typically, Sperry Rd would widened by approx 18 ft; however, additional widening would be necessary at the approaches to the ramp intersections as well as the Rogers Rd intersection in order to provide turn pockets. Retaining walls would be constructed along both sides of Sperry Rd under I-5, and the Sperry Rd Bridge at the California Aqueduct would be widened to accommodate the wider roadway. No improvements would be made to mainline I-5 as part of the proposed project.

The City of Patterson, the County of Stanislaus and Cal Trans put their heads together and came up with a solution to Patterson’s busy interchange. Work is scheduled to start in Fall of 2023.

The project will develop interchange improvement alternatives to enhance traffic operations needed to plan for growth within the City of Patterson and clear the project through NEPA and CEQA environmental processes. Key project responsibilities, features and challenges include the following:

• Management of preliminary engineering and environmental documentation

• Coordination with Caltrans District 10 for approvals through the Oversight process

• Coordination with Caltrans Structures Office of Special Funded Projects for approval of Bridge Advance planning Studies

• Coordination with the Department of Water Resources for proposed improvements within State Aqueduct right of way

• Development of improvements that satisfy level of service requirements for the 20 year design horizon while avoiding impacts to existing I-5 structures and the California Aqueduct bridge

• Preliminary civil, highway and structures design

• Analysis of alternative implementing roundabout control at the ramp intersections

• Utility research, conflict studies and coordination

• Development of Bridge Advance Planning Studies

• Development of a Project Report

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