construction | 511 Contra Costa

Construction Starts Mid-May 2017: Lafayette BART Station – North Lots

Starting in mid-May 2017, construction work will begin on the northern parking lots of the Lafayette Station as part of the Station Site Improvements Project.
The work will take approximately 8 months and be completed in two phases. Phase 1 will include the temporary relocation of the ADA lot and intermodal zone. Phase 2 will include the temporary relocation of the permit lot adjacent to Happy Valley Rd.
The entrance to the north side of the Lafayette BART station will remain open during construction.
While construction is taking place, you can use County Connection bus routes 6 and 25 to get to the station.

Overnight I-80 Closure June 18, 2016: San Pablo Ave to San Pablo Dam Rd

Overnight on Saturday, June 18, I-80 will be closed in both directions in the Richmond/San Pablo area for construction on the San Pablo Dam Road Interchange. The closure will be between San Pablo Ave and San Pablo Dam Rd and be in effect from 11pm Saturday, June 18 to 7am Sunday, June 19. Temporary detours will be in effect.
For more details on the closure, please visit the San Pablo Dam Road Interchange information page.

Construction: I-680 from Walnut Creek to San Ramon (Through Fall 2016)

Bay Area Express Lanes I-680Construction of a portion of the Bay Area Express Lanes on I-680 (between Walnut Creek and San Ramon) has begun and is scheduled to last approximately 15 months. Construction includes installation of variable message signs and overhead toll readers, concrete foundations for overhead freeway sign structures, and laying conduit and fiber optic communications cables for traffic management system communications.
The Metropolitan Transportation Commission (MTC) is scheduling construction work so that it will have minimal impacts on traffic. Construction will mainly occur at night, although there may be occasional activity on the shoulder and on arterial streets adjacent to the highway during the day to complete the communications network. Nighttime construction will typically involve closing one or two highway lanes, depending on the nature of the work.

Click for More on How Express Lanes Work

Express Lanes are specially-designated highway lanes that offer toll-free travel for carpools, vanpools, transit, motorcycles and eligible clean air vehicles. Solo drivers also have the choice to pay a toll to use the lanes for a more reliable trip. The Express Lanes between Walnut Creek and San Ramon will have an open access configuration, similar to HOV lanes.
The I-680 Express Lanes between Walnut Creek and San Ramon are scheduled to open in fall of 2016. For more information, you can visit or email to request project updates.
Construction is a dynamic process and information is subject to change without notice. Work is subject to weather conditions.

Southbound I-680 Marina Vista Ramp Closure: May 4 – October, 2015 (Martinez)

On May 4, a closure and detour will go into effect for the southbound I-680 Marina Vista/Waterfront Rd off-ramp in Martinez. The closure will remain in effect until October 2015. Between April and October, a seismic retrofit will be performed on the Mococo Overhead Bridge and the I-680 off-ramp will be replaced.
During the closure, southbound I-680 traffic will detour to the Arthur Road interchange, exit and cross under the freeway, return to northbound I-680, and exit at Marina Vista/Waterfront Road. Marina Vista and Waterfront Road will remain open during the extended ramp closure.
Please allow extra travel time when driving through this area and make sure to Slow for the Cone Zone. For more information about the project, visit the Caltrans Mococo Overhead Bridge Project webpage.
NOTE: Post edited to reflect postponement of closure to Monday, May 4.

Advisory: I-680 Mococo Overhead Bridge Project Lane & Ramp Closures (Mar. 2015)

CaltransHorizCaltrans District 4 has scheduled the following lane and ramp closures for the Interstate 680 Mococo Overhead Bridge Rehabilitation Project:
On-Ramp Closures
The Marina Vista on-ramp to southbound I-680 will be closed:

  • Thursday night, March 26, from 6pm-6am
  • 6pm Friday night, March 27 until 12pm Saturday, March 28

Lane/Shoulder Closures at the Marina Vista/Waterfront Road Interchange:

  • One northbound lane will be closed from 8pm Friday, March 27 to 5am Monday, March 30
  • The left shoulder of southbound I-680 will be closed from 8pm Friday, March 27 through 5am Monday, March 30

Upcoming Closure of Southbound I-680 Off-Ramp to Marina Vista/Waterfront Road
In late April 2015 Caltrans will close the southbound off-ramp from I-680 to Marina Vista/Waterfront Road. The closure will remain in effect for about five months while the contractor removes the old off-ramp structure and builds a new structure.

  • Detour: During this closure, southbound I-680 traffic will detour to the Arthur Road interchange, exit and cross under the freeway, return to northbound I-680, and exit at Marina Vista/Waterfront Road
  • Marina Vista and Waterfront Road will remain open during the extended ramp closure

Please drive cautiously through the construction zone, follow the directions of flaggers, leave a safe traveling distance between your vehicle and the vehicle ahead of you, and Slow for the Cone Zone. The California Highway Patrol will be on site during these closures.
For more information about the project visit the Caltrans I-680 Mococo Bridge Rehabilitation Project page.

Overnight Highway 4 Closure (Antioch): February 25-27, 2015

The California Department of Transportation and the Contra Costa Transportation Authority are constructing two new connector ramps, one connecting westbound State Route 4 (SR-4) to northbound SR-160, and one connecting southbound State Route 160 (SR-160) to eastbound SR-4 in Contra Costa County.
Part of this construction work entails adjustment of temporary bridge supports that span over SR-4. In order to ensure crew and public safety during this work, the contractor will close all lanes of SR-4 in the eastbound and westbound directions between the SR-4/SR-160 connector ramp and Laurel Road.
These closures are scheduled to take place on the evenings of February 25, 26, and 27th from 11:59pm to 5:00 am.
The detour for this work will be as follows:

  • Eastbound motorist will be directed off the highway at the SR-160 off-ramp and redirected to return to eastbound SR-4 via the Laurel Road on-ramp.
  • Westbound motorist will be directed off the highway at Laurel Road on-ramp and redirected to westbound SR-4 via the entrance of southbound SR-160.

Motorists are advised to expect delays and allow extra time for their commute. Please drive with caution through the detours and leave safe traveling distance between your vehicle and the vehicle ahead of you.

Lane #1 of SR-160 in Antioch to Be Closed Temporarily (Apr. 2014)

Caltrans will close Lane #1 of SR-160  in Antioch, in the northbound direction between SR-4 and the 18th Street/Main Street off-ramp on Thursday evening, April 24, from 6:00 pm to 6:00 am. Calrtrans and the Contra Costa Transportation Authority (CCTA) are constructing two new connector ramps, one connecting westbound Highway 4 to northbound SR-160, and one connecting southbound SR-160 to eastbound Highway 4 as part of the Highway 4 improvements.
The Highway 4 projects include improvements that will help revitalize eastern Contra Costa County. The projects expand Highway 4 from four to eight lanes between Loveridge Road and SR-160, add two connector ramps between Highway 4 and Highway 160, and add a BART extension from Pittsburg to Antioch (eBART). This will greatly improve transit accessibility for the region and help reduce traffic congestion and enhance the quality of life for the more than 250,000 residents of eastern Contra Costa County. The projects have been carefully staged to keep 130,000 vehicles per day moving as major construction and demolition work continue, and include over *$1.3 billion in State, Federal, Contra Costa Measure C & J sales tax, regional bridge tolls, and other local funds.

Construction Starts on SR-160/Hwy 4 Direct Connector Ramps (2014)


Construction Starts on SR 160/HWY 4 Direct Connector Ramps

State Route 160/Highway 4 Direct Connector Ramps Project is anticipated to start on Monday, March 24, 2014 in eastern Contra Costa County. The project will construct two new connector ramps, one connecting westbound Highway 4 to northbound SR 160, and one connecting southbound SR 160 to eastbound Highway 4. The ramps will create a connection between the Antioch Bridge and Highway 4 and provide residents and motorists in eastern Contra Costa County with important improvements in safety and mobility. 

Motorists are urged to use caution and slow down when entering the construction zone.

The first week in April, crews will conduct three to four days of installing cast-in-drilled-hole (CIDH) piles to support the connector ramps. (This process has been selected because it does not generate significant noise, and will minimize impacts to the surrounding communities.) Beginning in mid-April, construction hours will be extended to include two to three weeks of nighttime work to minimize daytime traffic impacts and maintain the project schedule.
Click here to view a map of the project location.

Buskirk Ave To Be Partially Closed Monday Sep 23-Friday Sep 27, 2013

Buskirk Avenue will be partially closed and flagged to one-way traffic typically from 7:30 A.M. to 4:00 P.M. from Monday, September 23 to Friday, September 27, 2013. Some work may occur outside these listed times depending on weather, field conditions and work conflicts. Motorists should expect delays during these construction periods. Please use alternate routes or allow for extra travel time.
The City’s contractors, Ghilotti Brothers and Saint Francis Electric, will be installing underground joint trenching across Buskirk Avenue near the Marshalls store from Monday, September 23 to September 27, 2013. This is the final joint trench conduit work required by AT&T and Comcast to complete their installation of underground wiring as part of the conversion of overhead wiring to underground (cutover) through this project area. After all the cutovers are performed, joint utility poles (poles shared by PG&E, AT&T and Comcast) will be removed along Buskirk Avenue and Hookston Road.

Buskirk Widening Starting Next Week

Construction on the Buskirk Avenue Widening Project in Pleasant Hill is scheduled to begin next week, May 20, 2013.  

What is it?

Buskirk-Avenue-Widening-2The project is to imrpove, reconstruct and widen Buskirk Avenue in Pleasant Hill, CA. In addition, drainage improvements, new pedestrian and bike facilities, new pavement and striping will be added to the Avenue.
Read more more on our blog post covering the Buskirk Avenue Project or the Stage 1 Notification PDF.

What are the construction impacts?

  • Typical construction hours will be from 8:00 am – 5:00 pm Monday-Friday.
  • Some variations including night and weekend work will occur.
  • The curved part of Buskirk along the southernmost side of the shopping center will be closed from Elmira Lane to Hookston Road.
  • Traffic will be detoured along the dogleg section of Elmira and Hookston. Buskirk will remain open to two-way traffic north of Elmira.

For more information including the purpose of the work read the Buskirk Ave- Stage 1 Notification.

How to Build a 21st Century Tunnel in Earthquake Country

Photo: Karl Nielsen/Metropolitan Transportation Commission

Building a modern-day tunnel in one of the country’s most active seismic zones starts with a mass of bodies. A meeting to discuss the subject begins with four engineering experts, and a Caltrans spokesperson.
What Pat Hipley, Gursharnjeet Cheema, Ben Edalati, Sean Coughlin and Ivy Morrison say about the $402 million project that promises to erase the daily parking lot known as California’s Highway 24 with a swift-flowing commute. The all-new fourth bore might be the safest spot in the San Francisco Bay Area, even  in the event of “the big one”.
Buried in the rocky depths of the Oakland/Berkeley Hills, Caldecott Tunnel is just 0.9 miles from the active Hayward Fault. The tunnel being considered a, “lifeline structure,” the seismic criteria required  3-D simulations to test deformation of the tunnel’s double-layer rebar cage lining. Twenty-five inch thick lining is composed of 15 inches of thin,flexible steel and approximately 10 inches of “codified” shotcrete, it’s designed to withstand vertical and horizontal forces.
Due to the mish-mashed, always-moving strata, actual excavation required special ventilation, a massive, custom-built 130-ton drill, and a technique known as the New Austrian Tunneling Method. This method requires intimate knowledge of the hardness and variability of a tunnel bore’s surrounding geology, which indicates the stress applied and dictates when supports must be erected during excavation.
The tunnel is scheduled to be open in 2013, the Operations and Maintenance Center (OMC) — a two-story structure above the tunnel’s west portals — will be the repository of all things connected. Hipley, who works with the California Geological Survey to maintain the bridges throughout the state, describes the bore’s Strong Seismic Motion Detectors.“The recorder’s in a fire niche, mounted in a recessed cabinet in the concrete,” he begins. “Detectors are at three quarter points and at each end and are wired back to the recorder. They measure acceleration: longitudinal, transverse, and vertical.” “The recorder has a 30-second buffer,” Coughlin explains, “it’s erasing the data, until a trigger hits, then it goes back and — boom – it captures data permanently.”
Photo: Karl Nielsen/Metropolitan Transportation Commission

A 4.0 earthquake would generate about 1.8 inches of movement. “We don’t think they’ll be much movement, because the tunnel is within a mountain,” he says.
“A tunnel is inherently stable; it moves with the hill,” says Coughlin. “You’re more likely to trigger a [walk-through] inspection because of a panel falling from the ceiling or the pavement bucking.”
“People will be more concerned with the bridges than the tunnel,” Hipley interjects.
“A bridge is like pushing someone on a swing, it’s going to go higher and higher; it’s called ‘harmonic vibration.’ But a mountain, it’s going to want to stop moving.”
Fire, which all of the experts agree poses more danger than earthquakes.
Linear heat detectors, cameras, jet fans and cross passages with intelligent control systems between bores three and four will improve a mass evacuation in the event of a fire or earthquake. Seventeen cameras in the new bore will transmit vital information to emergency responders. Variable message signs will run real-time, tunnel-specific updates and radio rebroadcast will allow fire departments to use a separate frequency (the absence of this was significant in the 1991 Oakland fire). Announcements to motorists will be broadcast regardless of AM or FM tuning and inner-tunnel repeater antennae will magnify cellular signals.
The OMC will feed information to Caltrans’ central Traffic Management Center and the California Highway Patrol within seconds, Edalati explains, but stops just short of delving into the security details.
Caldecott Tunnel Fourth-bore will be one of the most advanced, tech-laden tunnels in the world — and will also be one of the safest.
Read the full article here.

Caldecott Traffic Advisory: Planned Overnight Westbound Lane and Ramp Closures

Closures tentatively will occur Monday night, July 2 (ending in the early morning of July 3) and Thursday, July 5 (ending in the early morning of July 6).  There will be no closures on Tuesday night, July 3, or Wednesday, July 4.

  • Overnight Westbound Fish Ranch Road Onramp Closures (in Orinda): Occurring 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 between the hours of 9:30 p.m. and 4 a.m.
  • Overnight Bore Three Closures (towards Oakland): Occurring between the hours of 10 p.m. and 4 a.m.

Please note:  On Friday night (July 6) closures of the above lanes and ramps are planned to begin one hour later than the Monday – Thursday schedule described above.  The anticipated reopening times on Saturday, July 7, are as follows:

  • Westbound Fish Ranch Road Onramp in Orinda expected to reopen at 8 a.m. on Saturday, July 7
  • Westbound State Route 24 right lanes between Camino Pablo onramp in Orinda and Bore #3 expected to reopen at 7 a.m. on Saturday, July 7
  • Bore #3 (towards Oakland) expected to reopen at 7 a.m. on Saturday, July 7

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.
For more information on the upcoming closures visit the Traffic Page of the project website.