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TVTC Strategic Expenditure Plan 2022 Update │ Appendix <br />Draft Final Report │ Adopted: April 29, 2022 <br /> <br />A -2 B. SR 84/I-580 INTERCHANGE <br />TVTC PROJECT SPONSOR <br />City of Livermore <br />LEAD AGENCY <br />Caltrans, City of Livermore <br />PROJECT DESCRIPTION (UPDATED <br />SUMMARY 2021) <br />Project A-2b is located in Livermore, at <br />the intersection of I-580 and Isabel <br />Avenue including Portal Avenue. <br />The project consists of two phases: <br />• Phase 1 – The Isabel Avenue Interchange project which included replacing the I-580/Portola <br />Avenue interchange with the I-580/Isabel Avenue-SR 84 interchange. Phase I also included <br />realignment of Isabel Avenue and the realignment and extension of Portola Avenue from East <br />Airway Boulevard to Isabel Avenue. <br />• Phase 2 – The ultimate improvements at the I-580/Isabel Avenue-SR 84 Interchange are to provide <br />six lanes over I-580 at the Isabel Avenue-SR 84 Interchange and four lanes over I-580 at the Portola <br />Avenue overcrossing. <br />STATUS <br />A programmatic environmental assessment and right-of-way acquisition is complete. <br />Phase 1 <br />Construction of Phase I of the project was completed in March 2012. <br />Phase 2 <br />Conceptual design is approved. Project development activities are anticipated to begin in 2023. <br />PHASING AND SCHEDULE <br />The project is expected to be constructed in the following stages: <br />• Phase 1 – Completed and opened to traffic in March 2012. <br />• Phase 2 – Project development to begin in 2023. <br />