Tri-Valley Transportation Council - A-2b: State Route 84/I-580 Interchange

Projects

This project will construct a new partial cloverleaf interchange on the extension of Isabel Avenue (State Route 84) and I-580.

City of Livermore

Caltrans, City of Livermore

Project A-2b is located in Livermore, at the intersection of I-580 and Isabel Avenue including Portal Avenue.

The project consists of two phases:

Phase 1 – The Isabel Avenue Interchange project which included replacing the I-580/Portola Avenue interchange with the I-580/Isabel Avenue-SR 84 interchange. Phase I also included realignment of Isabel Avenue and the realignment and extension of Portola Avenue from East Airway Boulevard to Isabel Avenue.

Phase 2 – The ultimate improvements at the I-580/Isabel Avenue-SR 84 Interchange are to provide six lanes over I-580 at the Isabel Avenue-SR 84 Interchange and four lanes over I-580 at the Portola Avenue overcrossing.

A programmatic environmental assessment and right-of-way acquisition is complete.

Phase 1

Construction of Phase I of the project was completed in March 2012.

Phase 2

Conceptual design is approved. Project development activities are anticipated to begin in 2023.

The project is expected to be constructed in the following stages:

Phase 2:

Cost (Millions, 2015)	$35.70
Funding (Millions, 2015)
Measure BB	$0.05
Livermore Traffic Impact Fee (TIF)	$20.45
TVTDF	$5.15
Total Funding (Millions, 2015)	$25.65
Total Funding Shortfall (Millions, 2015)	$10.05