I-680 Contra Costa County | Plans + Projects | Our Work

I-680 Contra Costa County

I-680 in Contra Costa County
Credit
Noah Berger
Monday, September 26, 2016
Update

MTC and its partners are planning the following improvements on I-680 in Contra Costa County:

  1. Convert existing carpool lanes to express lanes between Rudgear Road in Walnut Creek and Alcosta Blvd. in San Ramon in both directions.
  2. Build southbound express lanes from the Benicia Bridge to Rudgear Road in Walnut Creek by adding a lane and converting existing carpool lanes.
  3. Build northbound express lanes from N. Main St. in Walnut Creek to the Benicia Bridge by adding a lane and converting existing carpool lanes.

Projects 1 and 2 are scheduled to be complete by 2018 and will add 5 new lane miles and result in 35 miles of express lanes in Contra Costa County. The schedule for Project 3 will be determined once funding is secured.

Learn more about the planned improvements in the I-680 Corridor in Contra Costa County Fact Sheet.

The project converts existing HOV lanes to express lanes on I-680 from Rudgear Road to Alcosta Boulevard in the southbound direction and from Alcosta Boulevard to Livorna Road in the northbound direction. It will result in 23 express lane miles through San Ramon, Danville, Alamo and southern Walnut Creek. No widening or additional lanes will be added to the highway.

Also, a communications network to support the express lanes will be implemented to enable real-time communications between toll system equipment along I-680 from Martinez to Dublin and a network hub at the Benicia-Martinez Toll Plaza Administration Building.

The Contra Costa Transportation Authority and MTC are working together to build southbound express lanes from the Benicia Bridge to Rudgear Road in Walnut Creek by adding lanes and converting existing carpool lanes. The partners will build northbound express lanes by adding and converting lanes from N. Main St. in Walnut Creek to the Benicia Bridge and implement operational improvements from Livorna Road to N. Main Street in Walnut Creek.