Construction Has Begun on the SR-84 from South of Ruby Hill Drive to I-680 and SR-84/I-680 Interchange Improvements Project

The California Department of Transportation (Caltrans) and the Alameda County Transportation Commission (Alameda CTC) are celebrating construction having begun on the State Route 84 (SR-84)/Interstate 680 (I-680) Interchange Improvements project. This $244.1 million project starts south of Ruby Hill Drive on SR-84 to I-680, located within the Tri-Valley.

The SR-84)/ I-680 Interchange Improvements project will enhance safety and accessibility for bicyclists and motorists along SR-84 and at the SR-84/I-680 interchange. Improvements include installing separated striped bicycle paths, modifying ramps, installing two additional miles of express lanes along southbound I-680, tree planting to increase the existing trees three-fold and providing safety for wildlife in the area.

“Completion of this project is made possible by the voters of Alameda County. Alameda County voters supported investments in SR-84 through transportation expenditure plans beginning with the 1986 Measure B, then the 2000 Measure B and more recently with the 2014 Measure BB” said Alameda CTC Executive Director Tess Lengyel. “These investments are critical to improving safety. During peak commute times when SR-84 is congested, collision rates on SR-84 and the I-680 interchange are higher than the state average; this project will change that. Cyclists and drivers will be able to maneuver in and out of driveways and travel more safely on SR-84 and local roads.”

For more information about the project, visit the Caltrans project website at or the Alameda CTC website at

See the video in celebration of breaking ground on this project.

SR-84 from South of Ruby Hill Drive to I-680 and SR-84/I-680 Interchange Improvements project area


Press Release