State Route 120 - McKinley Avenue Interchange Project

Project Facts


The SR 120 / McKinley Avenue Interchange Project is located along SR 120 between Yosemite Ave and Airport Avenue (PM 0.9/3.3) within the jurisdictional limits of both the City of Manteca and San Joaquin County. The financially constrained project will incorporate a spread diamond (Type L-2) interchange at McKinley Avenue while preserving the right of way for the originally approved partial cloverleaf (Type L-9) interchange. The approved project alternative includes on- and off-ramps, two new ramp bridges, auxiliary lanes on SR 120, ramp metering, and roadway improvements on McKinley Avenue, including a 10-foot wide sidewalk with Class 2 bike lane on both sides of the roadway. In the project design phase, the traffic operations were evaluated to confirm the project’s on-ramps could be constructed in phases with the interior loop on-ramps constructed later.  This change was documented in a Supplemental Project Report.

Project Benefits

SR 120 serves traffic within the Manteca area an interregional traffic between the Central Valley and the Bay Area. The project will help to reduce congestion; improve traffic circulation; and enhance safety for motorists, bicyclists, and pedestrians.

Funding Breakdown

The $46 million project was included in the Federal SAFETEA-LU bill as High Priority Program Project No. 1775, and received a federal earmark to help fund the planning and design. Right-of-way acquisition and construction will be funded by a combination of local, regional, and state funds.

Estimated Construction Cost: $25 Million

Funding Sources:

  • Federal Funds
  • Local Regional Transportation Impact Fees
  • Local Redevelopment Agency / Successor Agency Funds
  • Local Development Fees
  • State Transportation Improvement Plan Funds

PA&ED: Completed in Nov 2014
Design: Jun 2016 – Dec 2021 
Right of Way: Jul 2016 – Dec 2021
Construction: Spring 2022 – Fall 2023


City of Manteca

Project Contact

District 10 Public Information Office
1976 Dr. Martin Luther King Jr. Boulevard 
Stockton, CA 95205
Phone: (209) 948-7977 


Fact Sheet

Notice of Public Hearing (PDF)

Public Hearing Presentation (PDF)

Environmental Documentation (Final) (PDF)