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Construction Updates


Visit this page for construction and related notices for work occurring in San Dimas.


Note that while the City makes every attempt to provide you with the most up-to-date information, construction schedules may change with little or no notice for various reasons, including, but not limited to, weather conditions and unforeseen delays.


Thank you for your patience as we work together to improve the City of San Dimas!


CC2018-03 San Dimas Avenue Et Al Pavement Rehabilitation Project Including the Antonovich Trailhead Parking Lot



                  Antonovich Trailhead Parking Lot



San Dimas Avenue Et Al (Highlighted)


CC2018-03 San Dimas Avenue Et Al Pavement Rehabilitation Project is a super project that combines pavement rehabilitation of San Dimas Avenue from Via Verde Avenue to Puddingstone Drive, pavement reconstruction of Puente Avenue from Via Verde Avenue to Via Palomares and construction of parking lot improvement on the Antonovich Trailhead (Los Angeles County to reimburse the City for the cost of parking lot improvements).

In total, the project consists of over 530,000 square feet of pavement rehabilitation.  Concrete work includes the installation of over 3,200 linear feet of curb and the installation of 2,200 square feet of sidewalk.  All sidewalk corner ramps (ADA ramps) within the project boundaries will be upgraded to current standards.  Safety enhancements will be added to crosswalks including a solar-powered Rectangular Rapid Flashing Beacon (RRFB) at the Antonovich Trail crosswalk.  Parallel parking stalls and sidewalk will be added to the west side of San Dimas Avenue north of the Trailhead to provide an additional 12 parking spaces for trail users.  Accommodation of the additional parking stalls requires upgrading the existing guardrail and striping modifications.

This project is will start in August 2018 and will take approximately four months to complete.*

*NOTE:  Schedules outlined below are tentative and subject to change due to weather and other construction-related delays beyond City staff control. 

Project Update:

Week of December 17, 2018

  • Finish removals on Puente Street
  • Deep lift paving on Puente Street 
  • Pave final cap on Puente Street

Week of December 10, 2018

  • Final paving of San Dimas Avenue (delayed due to weather)
  • Begin removals on Puente Street
  • Pave deep lift sections on Puente Street

Week of November 26, 2018

  • San Dimas Avenue traffic to be controlled with pilot car during work hours
  • Pavement removals on San Dimas Avenue from 1,400 feet south of Avenida Loma Vista to north of the 57 Fwy
  • Deep lift pavement removals
  • Paving operations

Week of November 19, 2019

  • Contractor to complete concrete improvements at Antonovich Trailhead and ADA ramps
  • Install additional Best Management Practices (BMP’s) for predicted rain event

Week of November 12, 2018

  •  Contractor to grind and pave on San Dimas Ave north of Via Verde to the 57 Fwy. 
  • Traffic will be guided by Pilot Car during construction hours.  
  • Speed limit will be reduced to 25 MPH.  Speed reduction will be in effect until paving complete. 
  • Please obey posted speed limit signs as this speed reduction is necessary due to abrupt changes in grade, or other temporary conditions impacting traffic flow. 

Friday, November 9, 2018

  • A pilot car will be leading traffic on San Dimas Avenue in both directions south of Via Vaquero
  • Drivers may expect delays of up to 15 minutes due to the pilot car
  • Motorists are advised to take an alternative route if possible and allow extra time to travel San Dimas Avenue

Week of November 5, 2018

  • Beginning Monday November 5, 2018 through Saturday December 15, 2018 paving will take place on San Dimas Ave between Via Verde and Via Vaquero
  • Please expect frequent stops in both directions and a construction zone speed limit of 25 mph
  • Motorists are advised to use alternate routes whenever possible or allow extra time to travel San Dimas Avenue

Week of October 29, 2018

Antonovich Trailhead

  • Contractor to continue pouring curb
  • Install concrete ADA parking stall and sidewalk areas
  • Install Class 2 Base
  • Tentative for paving asphalt parking area

San Dimas Ave

  • Finish pouring curb
  • Compact deep lift areas and base pave
  • Install sidewalk ADA curb ramps

Week of October 22, 2018

  • Pour Concrete Improvements on Antonovich Trailhead
  • Pour Curb and Gutter San Dimas Ave

Week of Oct 15, 2018

  • Continue with Fine Grading of Antonovich Trailhead
  • Subgrade compaction Antonovich Trailhead
  • Compact Class II Base Antonovich Trailhead
  • Curb and Gutter removals on San Dimas Ave
  • Install RRFB conduit

Week of October 8, 2018

  • Continue with excavation at Antonovich Trailhead
  • Survey for fine grading at Antonovich Trailhead
  • Begin Concrete Improvements on Antonovich Trailhead
  • Begin removals of Curb and Gutter on San Dimas Ave

Week of October 1, 2018

  • Begin grading of Antonovich Trailhead
  • Excavate and remove excess soil
  • Install additional BMP’s for weather forecast

Week of September 24, 2018

  • Finish Mobilization
  • Begin Grading Antonovich Trailhead

Week of September 17, 2018

  • Finish Rough Grading at Antonovich Trailhead
  • Fine Grade Antonovich Trailhead to design elevations for hardscape improvements.

Week of September 10, 2018

  • Mobilization of equipment into Antonovich Trailhead
  • Complete installation of Stormwater protection BMP’s (Best Management Practices) along project
  • Begin Grading of Antonovich Trailhead

Please contact the Public Works Department with any questions or concerns related to this project at (909) 394-6240 or



CC2018-02 Golden Hills Road Reconstruction/Realignment Project



The new roadway alignment is in a gold in this image.

Existing Golden Hills Road between San Dimas Canyon Road and Linda Lane (west of Wheeler Avenue) has been closed to through traffic for public safety and is only accessible for emergency vehicles. The project includes the construction of the realigned Golden Hills Road (approx. ¼ mile in length) through the San Dimas Sediment Placement Site, a Los Angeles County Flood Control District facility (see attached project map).  The new roadway will provide additional access for the residents of La Verne and San Dimas, as well as provide access for emergency services to these areas.  The County of Los Angeles will also have better access to their San Dimas Canyon Dam facility.  Construction is anticipated to begin on August 13, 2018, and its anticipated to take approximately four months to complete.


Project Update:

The project was deemed substantially complete on November 28, 2018, with only minor construction work remaining for project completion, but the road is open to the public.  Please obey traffic laws and observe the posted speed limits.

Please contact the Public Works Department with any questions or concerns related to this project at (909) 394-6240 or


CC2018-05 Juanita Et Al Street Improvement Project:
Pavement Preservation

The Juanita et al pavement preservation project consists of asphalt pavement and miscellaneous concrete repairs for the above-highlighted streets.  Additionally, the project involves the reconstruction of Marchant Park parking lots which will take place after the dedication ceremony on July 28, 2018.

Project Update:

  • The project was substantially complete August 15, 2018, with only minor construction work remaining for project completion. Traffic striping and remaining punch list work are scheduled.

Please contact the Public Works Department with any questions or concerns related to this project at (909) 394-6240 or