California Department of Transportation

The State Route 132 West
Freeway/Expressway Project


Project Fact Sheet

Project Description:
The State Route 132 (SR 132) West Freeway/Expressway Project (SR 132 West) proposes to construct a four-lane freeway/expressway on a new alignment in Stanislaus County and in the City of Modesto from State Route 99 (SR 99) just south of Kansas Avenue west to near Dakota Avenue. The project proposes to implement either of the two build alternatives (Alternative 1 and Alternative 2) or a No-Build Alternative. Both build alternatives would construct a new four-lane, freeway/expressway from Dakota Avenue on the west end of the project to east of SR 99 at the Needham Street Overcrossing Bridge on the east end of the project. The major differences between Alternative 1 and Alternative 2 would involve the construction of a southbound SR 99 Needham Street off-ramp (Alternative 1) compared to the reconstruction of a southbound SR 99 Kansas Avenue off-ramp (Alternative 2). Under the No-Build Alternative, existing SR 132 (Maze Boulevard) would remain a two-lane, conventional highway.

SR 132 West improvements include providing freeway to freeway branch connections from and to SR 99 and a portion of the ultimate freeway corridor west of SR 99, as well as proposed direct connection from SR 132 to Needham Street overhead connecting to downtown Modesto. The Needham Street connection requires a new public road connection approval by the California Transportation Commission. In addition to the primary project elements, construction of the project proposes to encapsulate approximately 160,000 cubic yards of contaminated soil near the SR 132/SR 99 interchange. The soil was generated during excavation of industrial property that was purchased to construct the Modesto bypass during the 1960s. Contaminants in the soil include barium, strontium, and lead. The contaminated soil is within three soil stockpiles that exist in Caltrans right-of-way south of Kansas Avenue and within the proposed location for the project.

Purpose and Need:
The purpose of the project is to improve regional and interregional circulation, relieve traffic congestion along existing SR 132 (Maze Boulevard) and enhance safety and operations for the existing and proposed transportation network.  Motorists are experiencing a high level of congestion due to the limitations of the existing facilities, as well as an increase in interregional commuter and truck traffic.  Also, the connectivity of SR 99 and SR 132 requires travel through residential and commercial areas of Modesto.  Additionally, uncontrolled access to schools, churches, businesses, and residences along this roadway add to the slow moving traffic and increase the potential for conflicts between bikes, pedestrians, and vehicles.  Existing SR 132 (Maze Boulevard) within the project limits exhibits accident rates higher than the statewide average for similar highways.

The project proposes to improve two vital transportation corridors within Stanislaus County, existing SR 132 (Maze Boulevard) and SR 99. Existing SR 132 (Maze Boulevard) is part of the regional expressway system and is the primary east-west corridor in Stanislaus County. The two-lane, conventional highway provides interregional connection between Interstate 5 near the City of Tracy to the west and SR 99 in Modesto to the east. Existing SR 132 (Maze Boulevard) is the only east-west highway with access across the Tuolumne, San Joaquin, and Stanislaus rivers from Modesto. As such, SR 132 has increasingly served the San Joaquin Valley and has become a major truck route between Interstate 5 and SR 99.

In 1956, the proposed freeway corridor for SR 132 was adopted by the State with resolutions of support from Stanislaus County and the City of Modesto.  In 1958, the State allocated funds for right of way and proceeded with the acquisition of all but a few parcels.  Caltrans in conjunction with local agencies prepared three Project Study Reports (PSR) (in 1991, 1993, and 1997) to determine alternatives for consideration.  From 1998 to 2003 efforts were made to achieve consensus on a buildable segment and progressed to a Value Analysis Study.  Later in 2003, the project was placed on hold after it was determined that there was a need to complete additional system traffic planning studies to resolve the SR 132 West and SR 132 East connectivity concerns.  In 2008, Stanislaus Council of Governments (StanCOG) completed the Feasibility Study for the SR 132 East/West Connectivity Project in which various SR 132 improvements were identified to improve east-west connectivity in Modesto, which included several components of prior studies and evaluations.  In 2009 StanCOG completed a local Project Initiation Document, which established the project scope for use in planning the next formal studies for the Project Approval and Environmental Document (PA&ED) Phase.

Funding Source:
The project would consist of two construction phases: the initial construction phase and the ultimate build out. The initial construction phase is anticipated to begin in 2016 and be completed within 12 to 15 months. The ultimate build out is expected to be completed by 2028.

The initial construction phase proposes to construct general purpose lanes from Dakota Avenue to SR 99. The initial construction phase would also include construction of the SR 132 and North Carpenter Road interchange (to include the eastbound SR 132 off-ramp and the westbound SR 132 on-ramp), the SR 132 West/6th Street and SR 132/5th Street extensions, and various other improvements.  Encapsulation of the soil stockpiles, as described in the Remedial Action Plan, will occur primarily within the initial construction phase.

The ultimate build out would complete the SR 99 improvements, construct direct-connector ramps, and incorporate necessary structures to accommodate the SR 132/SR 99 interchange.

Caltrans is the lead agency under the California Environmental Quality Act and the National Environmental Policy Act, and is working in cooperation with StanCOG, the City of Modesto, Stanislaus County, and the California Department of Toxic Substances Control.  The anticipated cost of the ultimate project is $140 - $170 million.  A combination of federal, state and local funds is secured for the initial construction phase. 

Current Schedule

Project Phase


Project Study Report (M010)


Circulate Draft Environmental Impact Report/Environmental Assessment

January 2015

Project Approval & Environmental Document (M200)

October 2015

Begin Plans Specifications & Estimates for Initial Construction Phase

November 2015

Right of Way Certification (M410)


Initial Construction Phase


Ready – to – List (M460)

Spring 2016

Approved Construction Contract (M500)


Initial Construction Phase Completion (M600)


Ultimate Project


Approved Construction Contract (M500)


Project Completion (M600)