RES 99028 - Laserfiche WebLink

Project No. 3 1-680 Auxiliary Lanes between Bollinger Canyon Road in San Ramon and Diablo Road in Danville Lead Agency Contra Costa Transportation Authority Description This project will construct both northbound and southbound auxiliary lanes in the 1-680 corridor from Bollinger Canyon Road in San Ramon to Diablo Road in Danville. These improvements include an additional 12-foot lane between interchanges in the northbound and southbound directions, retaining walls, and soundwalls in the corridor. Also included are ramp improvements and structure widening over Laurel Drive between Sycamore Valley Road and Diablo Road. Cost Estimate $40 million Status A corridor planning level study was completed in September 1992. A Caltrans Project Study Report (PSR) is scheduled to be prepared in FY 2001. This project can be done in phases and the PSR is needed to identify usable segments and costs. Funding The 1998 CCTA Strategic Plan has programmed $1 million in existing Measure C funds in FY 2000 and FY 2001 for preliminary project development. The project will be funded with a variety of sources, including Measure C and the SCC JEPA, with full funding expected over a 15 year period. An additional $8 million in future Measure C funds is anticipated after 2005. $8.5 million should be available from the SCC JEPA fee in the same time period. The TVTC allocates $12 million in future TVTDF funds for this project. Schedule See above. The project is not contemplated for construction in the immediate future. Project Need Traffic studies of future conditions along 1-680 indicate that peak hour traffic volumes on the existing six mixed flow lanes and two HOV lanes will exceed capacity in the near future. The auxiliary lane project is not intended to increase freeway capacity per se, but will mitigate operational problems caused by merging and diverging vehicles at interchanges.