Contra Costa Air Quality

Closures tentatively will begin Monday night, June 18 and will occur nightly through Thursday, June 21 (ending in the early morning of June 22). Overnight Westbound Fish Ranch Road Onramp Closures (in Orinda): Occurring nightly between the hours of 9 p.m. and 5 a.m. Overnight Closures of right lanes on Westbound State Route 24 from the Camino Pablo Onramp (in Orinda) to Bore Three: Occurring nightly between the hours of 9:30 p.m.... Read the rest
Closures tentatively will begin Monday night, June 11 and will occur nightly through Thursday, June 14 (ending in the early morning of June 15). Overnight Westbound Fish Ranch Road Onramp Closures (in Orinda): Occurring nightly between the hours of 9 p.m. and 5 a.m. Overnight Closures of right lanes on Westbound State Route 24 from the Camino Pablo Onramp (in Orinda) to Bore Three: Occurring nightly between the hours of 9:30 p.m.... Read the rest
Below is the anticipated schedule of upcoming westbound ramp and lane closures associated with work on the Caldecott Fourth Bore Project. Please note that inclement weather may cause schedule changes. Closures tentatively will begin Monday night, June 4 and will occur nightly through Thursday, June 7 (ending in the early morning of June 8). Overnight Westbound Fish Ranch Road Onramp Closures (in Orinda): Occurring nightly between the hours of 9 p.m.... Read the rest
Note: there will not be any nighttime closures on Memorial Day. Nighttime closures will resume on Tuesday, May 29. Below is the anticipated schedule of upcoming westbound ramp and lane closures associated with work on the Caldecott Fourth Bore Project. Please note that inclement weather may cause schedule changes. Closures tentatively will begin Tuesday night, May 29 and will occur nightly through Thursday, May 31 (ending in the early morning of June 1).... Read the rest
Below is the anticipated schedule of upcoming westbound ramp and lane closures associated with work on the Caldecott Fourth Bore Project. Please note that inclement weather may cause schedule changes. Closures tentatively will begin Monday night, May 21 and will occur nightly through May 24 (ending in the early morning of May 25): Overnight Westbound Fish Ranch Road Onramp Closures (in Orinda): Occurring nightly between the hours of 9 p.m. and 5 a.m.... Read the rest
Below is the anticipated schedule of upcoming westbound ramp and lane closures associated with work on the Caldecott Fourth Bore Project for the week of May 14, 2012. Please note that inclement weather may cause schedule changes. Closures tentatively begin Monday night, May 14, and will tentatively occur nightly through Friday, May 18. Monday, May 14 – Thursday, May 18 Overnight Closure from Westbound Wilder Onramp to Bore 3 (towards Oakland): Occurring nightly, 9:30 PM – 4 AM Overnight Bore Three Closures (towards Oakland): Occurring nightly, 10 PM – 4 AM Overnight Closure from Westbound Fish Ranch Onramp (towards Oakland): 9 PM – 4 AM Overnight Bore Three Closures (towards Oakland): Occurring nightly, 10 PM – 4 AM Friday, May 19 – Saturday, May 20 Overnight Closure from Westbound Wilder Onramp to Bore 3 (towards Oakland): Occurring nightly, 10:30 PM – 7 AM Overnight Bore Three Closures (towards Oakland): Occurring nightly, 11 PM – 7 AM Overnight Closure from Westbound Fish Ranch Onramp (towards Oakland): Occurring nightly, 10 PM – 8 AM In addition to the excavation of a 3,400-foot-long tunnel north of the existing three bores, the $391.8 million Caldecott Fourth Bore Project includes traffic improvements on the eastern and western sides of the tunnel.... Read the rest
Below is the anticipated schedule of upcoming westbound ramp and lane closures associated with work on the Caldecott Fourth Bore Project for the week of May 7-11, 2012. Please note that inclement weather may cause schedule changes. Closures tentatively begin Monday night, May 7, and will tentatively occur nightly through Friday, May 11. Monday, May 7 – Thursday, May 10 Overnight Westbound Fish Ranch Road Onramp Closures (in Orinda): Occurring nightly, 9 PM – 5 AM Overnight Closures of right lanes on Westbound State Route 24 from Camino Pablo Onramp (in Orinda) to Bore Three (towards Oakland): Occurring nightly, 9:30 PM – 4 AM Overnight Bore Three Closures (towards Oakland): Occurring nightly, 10 PM – 4 AM Friday, May 11 Please note: On Friday night (May 11) closures of the above lanes and ramps are planned to begin one hour later than the Monday – Thursday schedule.... Read the rest
URGENT: FINAL WEEK OF THE COMPETITION! SUBMIT YOUR ENTRY SOON! Competition Deadline: 4:30 PM, Monday, May 7, 2012 The Fourth Bore of the Caldecott Tunnel will bring congestion relief to busy State Route 24 between Alameda and Contra Costa Counties. The Caldecott Medallion Design Competition will provide the children of these two counties an opportunity to play a role in the design of an important architectural detail of the Fourth Bore.... Read the rest
Below is the anticipated schedule of upcoming westbound ramp and lane closures associated with work on the Caldecott Fourth Bore Project for the week of April 30-May 4, 2012. Please note that inclement weather may cause schedule changes. Monday, April 30 – Friday, May 4 Overnight Westbound Fish Ranch Road Onramp Closures (in Orinda): Occurring nightly, 9 PM – 5 AM Overnight Closures of right lanes on Westbound State Route 24 from Camino Pablo Onramp (in Orinda) to Bore Three (towards Oakland): Occurring nightly, 9:30 PM – 4 AM Overnight Bore Three Closures (towards Oakland): Occurring nightly, 10 PM – 4 AM Friday, May 4 – Saturday, May 5 Please note: On Friday night (May 4) closures of the above lanes and ramps are planned to begin one hour later than the Monday-Thursday schedule.... Read the rest
Below is the anticipated schedule of upcoming westbound ramp and lane closures associated with work on the Caldecott Fourth Bore Project for the week of April 23-27, 2012. Please note that inclement weather may cause schedule changes. Monday, April 23 – Thursday, April 26 Overnight Westbound Fish Ranch Road Onramp Closures (in Orinda): Occurring nightly, 9 PM – 5 AM Overnight Closures of right lanes on Westbound State Route 24 from Camino Pablo Onramp (in Orinda) to Bore Three (towards Oakland): Occurring nightly, 9:30 PM – 4 AM Overnight Bore Three Closures (towards Oakland): Occurring nightly, 10 PM – 4 AM Friday, April 27 – Saturday, April 28 Please note: On Friday night (April 27) closures of the above lanes and ramps are planned to begin one hour later than the Monday-Thursday schedule.... Read the rest