US 101/SR 25 Interchange - Phase 1

The existing US 101/SR 25 interchange, located just south of Gilroy in Santa Clara County, is over thirty years old.

It cannot accommodate traffic demands due to rapid growth in commuter, commercial, and recreational traffic that passes through this area. These conditions, coupled with high travel speeds, have resulted in higher than average accident rates in the interchange area, and traffic backups onto southbound US 101.

This Phase 1 project sets the stage for a future implementation of the overall interchange reconfiguration slightly north of the current interchange. Phase 1 will...

The existing US 101/SR 25 interchange, located just south of Gilroy in Santa Clara County, is over thirty years old.

It cannot accommodate traffic demands due to rapid growth in commuter, commercial, and recreational traffic that passes through this area. These conditions, coupled with high travel speeds, have resulted in higher than average accident rates in the interchange area, and traffic backups onto southbound US 101.

This Phase 1 project sets the stage for a future implementation of the overall interchange reconfiguration slightly north of the current interchange. Phase 1 will accommodate future improvements to US 101, SR 25, SR 152, and provide a connection point at the interchange for a future Santa Teresa Boulevard extension to Castro Valley Road.

Objectives

  • Improve connectivity between US 101 and SR 25
  • Improve traffic operations along US 101 and SR 25 with added ramp storage and signals
  • Enhance safety within the interchange area by reducing ramp backups onto southbound US 101 and provide improved access for safer merges
  • Support the overall future interchange reconfiguration, including US 101 and SR 25 widening, and future SR 152 improvements between US 101 and SR 156

Project Features

Phase 1 will reconstruct the US 101/SR 25 interchange slightly north of the current interchange.

  • Replace the SR 25 two-lane overcrossing with a four-lane overcrossing spanning across US 101
  • Increase the length of the southbound US 101 off-ramp to SR 25 to decrease traffic back-ups onto US 101
  • Upgrade the northbound US 101 ramps to improve exit and merging operations
  • Install new traffic signals at the ramp intersections to improve traffic flow

As additional funding becomes available, future phases of interchange improvements will be scheduled. These future upgrades include converting the interchange to a partial cloverleaf or diamond ramp configuration with potential direct connectors, frontage roads for local and bicycle access, and grade separating SR 25 from the Union Pacific Railroad east of US 101.

The overall project is included in the Valley Transportation Plan (VTP) 2040 Highway Program.

Community Outreach

Quarterly updates are provided to the Mobility Partnership. The Mobility Partnership provides policy oversight and direction to staff of VTA and the Council of San Benito County Governments regarding potential mobility improvements between US 101 and I-5 in southern Santa Clara and northern San Benito Counties. 

VTA staff are updating the environmental documents. A project update and community meeting are anticipated for mid-to-late spring, 2020. 

Timeline

Title
Design
Phase Date Range
-
Title
Environmental Update
Milestone Date
Title
Construction
Phase Date Range
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Funding

Total Funding
Estimated $100 Million

Map

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