Treat Blvd. Paving (Phase 1) 

To keep community members updated about 
the status of CPJ 2559 Location Maponcord's Treat Boulevard Pavement Rehabilitation - Phase 1 (PJ 2559)
City staff will update this page regularly with news and photos. 

Have questions? Please contact our Engineering staff.

For more information on the full depth reclamation process, please visit Full Depth Reclamation (FDR) Process Video


Eastbound Direction: 6:00 a.m. to 2:00 p.m.

Westbound Direction: 10:00 a.m. to 6:00 p.m.


8:00 P.M. to 6:00 a.m.


Primary Contractor

Bay Cities Paving & Grading


Rosas Brothers Construction (Concrete Curb, Gutter, Sidewalk, Curb Ramps)

Pavement Recycling Systems (Full Depth Reclamation)

Sierra Traffic Markings (Striping and Signs)

St. Francis Electric (Traffic Signal Conduits)

Full Depth Reclamation Phases (Walnut Creek City Limits to Oak Grove Road)

Legend - Treat

Phase 1-3 Treat

OcTOBER 20, 2023

All work on the Phase 1 pavement rehabilitation project is now complete.  Areas of new concrete that were cracking have been replaced by the Contractor and the project will be moving towards acceptance and close out.  With the paving project now complete, over the upcoming week there will be traffic signal cabinet work taking place on Treat Boulevard at the Oak Grove Plaza Driveway intersection and the Winton Drive intersection as follows:

Tuesday, October 24 from 9:00 a.m. to 3:30 p.m.  Treat Boulevard / Oak Grove Plaza Driveway

Traffic signal cabinet replacement.  The signal will be dark or flashing red during this time.

Thursday, October 26 from 9:00 a.m. to 3:30 p.m.  Treat Boulevard / Winton Drive

Traffic signal cabinet replacement.   The signal will be dark or flashing red during this time.

Please observe all construction signage and drive safely.

September 12, 2023

The project is substantially complete now that paving and final striping have been done (see below image of Walnut Creek/Concord border). All that remains are smaller items including sign installations and site cleanup prior to closing out the project. There will also be some traffic signal cabinet replacement work taking place at the Winton Drive and Oak Grove Plaza intersection sometime within the next month, but traffic impacts will be minimal. Thank you for your patience during construction of the Treat Boulevard Pavement Rehabilitation Project (Phase 1). Construction of Phase 2 of Treat Boulevard (San Miguel Road to Clayton Road) is anticipated to begin Spring/Summer 2024. 


AUGUST 2, 2023

As of last Friday, Bay Cities Paving & Grading has completed all paving operations on Treat Blvd. Last week the final 2 inches of rubberized asphalt were placed in all lanes throughout the project limits from Carondelet High School all the way to San Miguel Road. Work was performed in the evening between 8:00 p.m. and 6:00 a.m. each day. See below pictures of rubberized asphalt placement and compaction. Temporary “floppies” have been installed until final striping of lane lines and pavement markings are complete.

 TC_04921 RHMA Compaction

7-28-23.11 RHMA Placement

For the next 2-4 weeks, the Contractor will be raising maintenance hole and valve covers to the finished grade, and installing final striping (which is currently under review by the City). Lane closures will be required for striping and raising utility covers. Striping work is expected to take place during the evening hours, and utility covers will be performed during the day due to the loud equipment (jackhammering, etc) required to complete this portion of the project. The only other remaining items for the project are planting replacement trees in sidewalk areas that were previously removed, as well as the installation/pulling of traffic signal fiber optic cables (conduits were previously installed).

July 20, 2023

The City’s contractor, Bay Cities Paving & Grading has completed the full depth reclamation (FDR) and paving operation west of Oak Grove Road as of Tuesday, July 18. Lanes west of Oak Grove Road were reopened to traffic with temporary striping in place as of early Wednesday morning. 

Starting Tuesday evening, July 18, through Thursday evening, July 20, Bay Cities began their first night shift of removing and replacing hot mix asphalt east of Oak Grove Road to San Miguel Road, and continued this work in all three lanes. Temporary striping will also be installed.  

The temporary striping will remain in all areas until the final 2-inch rubberized asphalt lift is placed throughout the entire project limits (which is scheduled to take place in the evening next week from  8:00 p.m. to 6:00 a.m., Monday through Friday) to complete all paving operations for the project. 

It is important to note that the City made modifications to extend lane closure hours allowing two lanes of continuous construction at the same time, and recently allowed evening work for hot mix asphalt placement to speed up construction and significantly reduce the duration of traffic impacts on Treat Boulevard. As a result of these changes, FDR and paving operations west of Oak Grove Road were completed two weeks ahead of schedule. All remaining paving for the project is expected to be complete by July 28, ahead of the Japanese American Festival taking place the following weekend, and well ahead of the start of the school year at De La Salle and Carondelet. 

July 20 PJ 2559 Photo 1

July 14, 2023

Nighttime paving from Oak Grove Road to San Miguel Road will begin next week (as early as Monday night) and continue for 3-4 nights. Working hours will be 8 p.m. to 6 a.m. All lanes will be reopened to traffic outside of these working hours. 

During active construction, two lanes at a time will be closed in the eastbound and westbound directions. Temporary driveway and side street entrance closures may occur, but emergency access will always be provided. 

For additional details, please see the notice from Bay Cities Paving & Grading

JULY 12, 2023

Great news! Our project is now ahead of schedule thanks to recent modifications to lane closures and hours. 

Construction on Treat Blvd. west of Oak Grove Rd. will be closing two lanes (middle and inside lanes) continuously in both directions, now through early next week. 

As a result, the full depth reclamation (FDR) work west of Oak Grove is now expected to be completed by July 19 -- not early August, as originally planned.

This change will allow the contractor to re-open this segment of Treat Blvd. much sooner than originally anticipated. The eastbound left turn on Treat to northbound Oak Grove will be open/accessible by the end of the day on July 14, and over the weekend. 

Please expect significant delays around the Treat Boulevard/Oak Grove Road intersection the rest of this week and into early next week.

With the previous week including the 4th of July holiday, work only took place Wednesday through Friday. Bay Cities pulverized the middle lane in each direction (see photo below), with two lanes open (inside and outside lane) over the weekend and into this week. 

From now (July 12) and into the middle of next week, cement curing will take place in the middle and inside lanes of each direction on Treat Boulevard (Stage 2 and Stage 3 of diagram above), and placement of 8 inches of hot mix asphalt will take place the following days. The road will be two inches lower until the final two inch lift of rubberized asphalt is placed throughout the entire project limits (Date TBD). Temporary lane line striping and pavement markings will be installed next week. After next week, the Contractor will move east of Oak Grove Road to complete a much simpler mill and fill (remove and replace) that will be much less impactful to traffic and the community.

As always, please be mindful of detours, delineators, signage, and limited left turn opportunities, as vehicles will only be allowed to drive in the outside lanes for the next week. With only one more week of continuous lane closures, the City is appreciative of everyone’s patience thus far.

The Oak Grove Road paving project is also underway this week through next Monday. If possible, use alternate routes and expect significant delays.

The left turn going eastbound on Treat Boulevard to northbound Oak Grove Road will be made accessible once the placement of hot mix asphalt on the middle lane is complete. This left turn is expected to be accessible again by the end of the day on Friday, and over the weekend.

July 12 Update EB 2 Lane W of Winton 18inch FDR Pulverizing

July 12 Update EB 2 Lane Cement Placement

July 12 Update Median Concrete Pour - Citrus Ave

July 3, 2023

The previous week, Bay Cities completed the FDR operation in the outside lane in each direction from Carondelet High School to Oak Grove Road. Cement and water were allowed to cure, and on Thursday and Friday of last week 8-inches of hot mix asphalt was placed. The pavement is currently left 2-inches lower in these outside lanes until the final layer of rubberized asphalt is placed together on all 3 lanes. 

July 3-7 Update

This week (July 3 - July 7):

Modified lane closure hours for the week of July 3 - July 7 - In order to speed up the FDR operation west of Oak Grove Road to complete work before school is back in session, lane closure hours are being revised to the following:

Eastbound Direction: 6:00 a.m. to 2:00 p.m.

Westbound Direction: 10:00 a.m. to 6:00 p.m.

The Contractor will continue their FDR operation between Carondelet High School and Winton Drive, moving into the middle lane (each direction) starting on Thursday, July 5. The inside lane and left turn pockets will be taken as well during work hours for equipment and worker safety, and only the outside lane will be open to traffic. At the end of each day, the middle lane will remain closed continuously, similar to the first phase where the outside lanes were closed. Traffic will be split into either the inside lane or outside lane. Please exercise caution driving through the project limits and be mindful of the reduced speeds, detours, and limited left turn opportunities. The middle lane in each direction will be under construction for up to the next 10 days, with the same cement & water curing process, followed by paving with hot mix asphalt over the strengthened cement-treated base.

JUNE 22, 2023

Traffic signal fiber optic conduit installations in the center median were complete on Treat Blvd from Winton Drive to Oak Grove Road by the end of day on Tuesday. Traffic control involving closure of the outside lane (each direction) was in place by end of day Tuesday and the FDR operation began Wednesday morning. During work hours, traffic was reduced to one lane in each direction. Up to 18 inches of asphalt and soil were pulverized in the outside lane in the EB direction (starting in front of Carondelet High School) from 7AM into the early afternoon, and the outside lane in the WB direction from Oak Grove Road to Fire Station #10. Thursday, the milling and removal of 10 inches of material began continuing westbound from Station #10, with numerous trucks off hauling material. Friday will begin the FDR mixing process of cement and water up to 18 inches in depth the remaining material, followed by rolling/compacting the material. This process will continue into next week, as this mixed material will be required to cure and strengthen for at least 5 days prior to asphalt paving. Because of the resulting 10 inch drop off next to traffic in the closed lane(s), 4:1 slopes will be installed along this drop off at the end of each work day, and delineators placed along the closed lane(s) for public safety. Please be aware of reduced speed limit (30 mph) through the work zone, traffic control signage, detour signs, delineators, and merging/shifting lanes. Expect significant delays on Treat Blvd during all FDR and paving operations.

Fiber Conduit Boring Machine In Action

FDR Pulverizing Machine In Action EB Lane

Installing 4 to 1 Taper at 10in Dropoff

Next week (June 26 through June 30):

The Contractor will continue cement/water mixing and compaction of the existing material as part of the FDR process in the outside lane (EB and WB direction). Placement and compaction of hot mix asphalt over the cured cement base material is expected to begin next Thursday. Once that is completed, the Contractor will move to the next phase of the FDR process, the middle lane both the EB & WB direction.

JUNE 15, 2023

Concrete pouring of curb ramps, curb, gutter, and sidewalk will are expected to be fully complete by the end of this week. Fiber optic conduit and street lighting conduit repair are expected to be complete prior to Tuesday next week between Winton Drive and Oak Grove Road. Work on that will continue through the end of this week. Video detection cameras and cables on the traffic signals from Winton Drive to San Miguel Road are expected to be installed by the end of this week and fully operational. Fiber optic conduit work in the median is expected to continue through the end of this week and into the middle of next week.  



Coming up next week (June 19th through June 23rd):

The City’s Contractor is set to begin the full depth reclamation (FDR) process starting next Wednesday, June 21st, and is expected to last through the first week of August. The limits of FDR are from Walnut Creek City limits (in front of Carondelet High School) to the Oak Grove Road intersection. Significant delays in traffic should be expected.

The Full Depth Reclamation process for this project involves removing the top 10 inches of asphalt, pulverizing and mixing another 18 inches of underlying asphalt/base rock/in place with cement, a total depth of 28 inches. Then, new hot mix asphalt will be placed up to 2 inches below the surface. The final top 2 inches of rubberized hot mix asphalt will be placed all at once for all lanes as the final item of work of the paving operation.

The FDR work will take place in 3 Phases for both the eastbound and westbound directions concurrently, as follows: Phase 1 – Outside Lanes (starting this week), Phase 2 - Middle Lanes, Phase 3 – Inside Lanes. Up to two lanes will be closed at a time during the lane closure hours, which are 7:00 AM to 1:00 PM in the eastbound direction, and 11:00 a.m. to 5:00 PM in the westbound direction. Two lanes need to be closed during the work hours due to the heavy equipment involved, and to be able to provide a safe working environment. The lane undergoing the FDR process will be closed continuously for approximately 10 days to allow time for curing. Two lanes of traffic will be open to traffic at the end of each work shift.

Phase 1

Driveway and side street entrance closures may occur for up to six hours while work is occurring

at these locations. Emergency access will always be provided. There will be traffic and pedestrian handling procedures put in place to minimize any inconveniences that may be caused by construction, however, we recommend taking alternate routes where possible. Please be aware of reduced speed limits, traffic control signage, detour signs, delineators, and merging/shifting lanes. Bus stop locations are subject to change during construction. Expect significant delays on Treat Blvd during all paving operations.

JUNE 08, 2023

Concrete pouring of curb ramps, curb, gutter, and sidewalk continued east of Oak Grove Road down towards San Miguel Road (project limits), as well as investigation of existing fiber optic conduit in the medians of Treat Blvd to identify if they require replacement.  Some concrete curb and gutter west of Oak Grove was also replaced. One foot hot mix asphalt plugs were placed in front of all the new concrete curb and gutter. These were previously excavated to provide room for formwork. St. Francis Electric successfully installed new conduit at the Treat/Winton intersection so now video detection cameras can be installed (and connected to the traffic signals) to detect vehicles instead of loop detectors beneath the pavement that would be in conflict with any paving operations.


For the next week (June 12th through June 16th), concrete curb, gutter, and sidewalk is anticipated to be entirely complete throughout the project limits (aside from restorations related to traffic signal work), pending any delays, with 1’ asphalt plugs being completed as well. St. Francis Electric will begin replacement of existing fiber optic conduits in the medians and sidewalk of Treat Blvd from Winton Drive to Oak Grove Road (where needed). St. Francis will also be completing their installation of new conduit for the Treat Blvd and San Simeon Drive intersection. Video detection cameras at all intersections between Winton Drive and San Miguel Road are anticipated to be fully functional by the end of the week (the 16th).

Full Depth Reclamation (FDR) process which will take up to 2 lanes at a time during work hours, is expected to begin June 20th. More accurate details to be provided in next week’s update.

June 01, 2023

Trees either in conflict with sidewalk or deemed at risk were removed, and branches were trimmed for paving operations later in the project. Concrete curb, gutter, and curb ramps continue to be poured and completed, with concrete work progressing towards the east end of the project between San Simeon Drive and San Miguel Road. St. Francis Electric installed new traffic signal conduit and boxes in the sidewalk at the Winton Drive intersection, and began some investigation work at San Simeon Drive.



For the next week (June 5th through June 9th), concrete curb, gutter, and sidewalk work will continue east of Oak Grove Road, with 1’ asphalt plugs being completed west of Oak Grove Road alongside the new concrete curb and gutter previously poured in place. St. Francis Electric will continue their fiber optic investigative work in preparation for the new traffic signal conduits crossing Treat Bvld at Winton Drive and San Simeon Drive.

May 25, 2023

Rosas Brothers Construction (subcontractor to Bay Cities) continued concrete demolition work and concrete formwork placement west of Oak Grove Road with pedestrian detours in place. Some new concrete curb, gutter, and curb ramps have been poured and completed. Bay Cities continued their potholing of existing utilities in the outer lanes in both directions on Treat Blvd, and starting lowering utility cover iron in preparation for paving work taking place next month. St. Francis Electric (subcontractor to Bay Cities), began working on preparatory traffic signal conduit work, potholing, and preparing layouts for new signal conduits to be installed. 

Curb and Gutter Formwork 052223

New Curb Ramp (BethanyTreatNE Corner) 052323

Bay Cities Potholing 2930 Treat Blvd 052423

For the next week (May 29nd through June 2nd), utility potholing work will continue, and concrete removal, formwork, and pouring of concrete curb, gutter, and sidewalk will begin east of Oak Grove Road. Trees selected for demolition will be removed if roots are in conflict or causing issues related to uplifted sidewalk or gutter. St. Francis Electric will also begin connecting their fiber optic conduit from Oak Grove Road into the Treat Blvd intersection’s median. 

MAY 17, 2023

Construction on Treat Boulevard began this Monday, May 15th, as originally planned. The Contractor, Bay Cities Paving & Grading (Bay Cities), began marking and potholing existing utility depths, demolition of existing concrete for curb, gutter, and sidewalk repairs. Some trees will be removed and replaced as part of the sidewalk repair work.

 Photo 1Photo 2

For the next week (May 22nd through May 26th), utility potholing work will continue, along with concrete removal, form placement, and pouring of concrete curb, gutter, and sidewalk. The Contractor will also begin installation of fiber optic conduits and cable. Work is progressing starting in front of Carondelet High school and heading northeast towards Oak Grove Road. Temporary lane closures will remain in effect during the specified lane closure hours in each direction.

May 04, 2023

The Treat Boulevard Pavement Rehabilitation Project (Phase 1) – City Project No. 2559, is expected to begin construction on Monday, May 15, 2023, weather permitting. Phase 1 of the project is between Walnut Creek City Limits (in front of Carondelet High School) to San Miguel Road. Project improvements include pavement rehabilitation, fiber optic conduit and wire installation for the traffic signals, removal and replacement of concrete (curb, gutter, sidewalk, and curb ramps), sidewalk trees, and restriping.

The primary purpose of the project is to rehabilitate the pavement of Treat Blvd which has been long overdue. Thanks to the passage of Measure V, funding now exists to repair this roadway. The rehabilitation method will be a process called full depth reclamation (FDR), where the existing roadway is pulverized (one lane at a time), and the existing asphalt and base soil is mixed with cement and lime, prior to replacement and compaction. This process will greatly increase the strength and useful life of Treat Blvd. Significant delays should be expected throughout construction, as up to two lanes will need to be closed for the FDR process to take place.

Please check this website weekly for updates on schedule:

The first order of work (during the first week of construction) will be potholing at various locations along Treat Blvd to identify potential utility conflicts beneath the pavement, and implementation of traffic control.  

The project is anticipated to be completed by October 2023, weather permitting.