RES 99028 - Laserfiche WebLink

Project No. 8 1-680/Alcosta Boulevard Interchange Modifications Lead Agency Caltrans, San Ramon Description Reconstruct the southbound off ramp and add a new on ramp at the 1-680/Alcosta Boulevard interchange to improve operations at the interchange. This project includes closing the existing southbound off ramp and removing a traffic signal, building new southbound on/off ramps to the north of Alcosta Boulevard, and connecting to San Ramon Valley Boulevard with a new signalized intersection. Cost Estimate $9.6 million Status The PSR for this project, which was funded by Measure C, is complete. This project currently is in the San Ramon CIP program for FY 99 and FY 00. The SCC JEPA designates $2.3 million for the project, with funds available in 2001. TVTC made a preliminary commitment of $2.0 million for the project, with the remainder to come from local sources. The project is ready to proceed to design in FY 99 and to construction in FY 00. The TVTDF funding for this project should be made available to coincide with the planned construction. Funding $2.3 million is identified in the Southern Contra Costa JEPA for this project. The TVTC allocates $1.6 million in future TVTDF funds for this project. The remaining $5.7 million would be from local funds. An application for 1998 STIP funding for this project is pending. Schedule See Status above. Project Need The current interchange is a tight diamond with a busy intersection of two arterials immediately adjacent to the interchange. Reconstruction of the southbound ramps into a buttonhook design will remove the middle of three closely spaced traffic signals on Alcosta and improve safety and capacity in the area. The interchange traffic volumes are projected to increase as a result of growth in the area.