Since its incorporation in 1960, the unprecedented growth of San Dimas has transformed the City from an essentially rural area to a well-balanced community offering industrial, commercial, and residential living. In addition to the 1,700 acre Frank G. Bonelli Recreational Area which lies within the City boundaries, there are many parks such as San Dimas Canyon Park, a city-owned golf course (San Dimas Canyon Golf Club), and over 27 miles of equestrian trails for riding. The city services include an extensive recreational program for youth and for senior citizens, and the City boasts a new modern City Hall, with excellent provisions made for County Sheriff and Fire Departments, along with a fine Los Angeles County Library and Engineering Regional Office.
EMERGENCY CLOSURE: SAN DIMAS AVENUE LOOP-500 FEET NORTH OF CALLE SOLANA
The San Dimas Avenue Loop road repair project is currently in the final phase of design, with reconstruction of the damaged area located 500 feet north of Calle Solana, anticipated to begin in late Spring 2024, pending the relocation of several utilities. Utility work, starting with the telecommunication lines, is expected to begin as early as January 2024.
What to Expect:
- Construction will take place between 7 AM and 6 PM, Monday through Friday.
- The utility relocation phase impacts will be intermittent.
- Temporary Lane and Road closures will be clearly marked for your convenience.
If you have any questions or concerns regarding this work, please contact the Public Works Department at (909) 394-6240 or email us at publicworks@sandimasca.gov. Updates can also be found on the City’s website: https://sandimasca.gov under the Public Works Department.
Please continue to obey all traffic control signs and markings as they are in place to protect you and your neighbors. We thank you for your cooperation and patience in this matter.
As of Friday, 5/12/23, the temporary traffic striping re-configuration was completed and the San Dimas Avenue Loop was re-established for two-way traffic.
Please obey all traffic control signs and markings as they are in place to protect you and your neighbors. We thank you for your cooperation and patience in this matter.
Resident and commuter safety are of primary concern. The City will continue to monitor the area and may adjust the traffic configuration based upon field observations and recommendations from the Geotechnical and Civil Engineers.
Long term repairs for the street are in design and are estimated to cost approximately $4 million. These repairs will include relocation of utilities (water and electrical lines), 500 linear feet of retaining walls, extensive earthwork, guard rail, paving and striping.
Please contact Public Works at (909) 394-6240 or publicworks@sandimasca.gov should you have additional questions.
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UPDATE 4/28/2023 Staff is working with a Geotechnical Engineer and Civil Engineer to open the eastern side of the San Dimas Avenue Loop to two-way traffic. This will require narrowing the roadway and shifting traffic closer to the west curb line. City crews are currently working to get the road ready for the reconfiguration of traffic.
The two-way road reconfiguration is anticipated to be completed and open by mid-May, 2023
Resident and commuter safety are of primary concern. The City will continue to monitor the area and may adjust the traffic configuration based upon field observations and recommendations from the Geotechnical and Civil Engineers.
Long term repairs for the street are in design and are estimated to cost approximately $4 million. These repairs will include relocation of utilities (water and electrical lines), 500 linear feet of retaining walls, extensive earthwork, guard rail, paving and striping.
Please obey all traffic control signs and markings as they are in place to protect you and your neighbors. We thank you for your patience.
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(Previous Update)
The northbound lane of San Dimas Avenue north of Calle Solana has been closed since February 25, 2023 due to storm damage compromising the roadway. City staff apologize for the inconvenience and are actively working on the complex analysis and solution to restore full access to the neighborhood. This webpage provides current information while the City works diligently to resolve this unusual situation. Due to the complexity of the damage and repair, this will be an extended lane closure of a minimum of 9 to 12 months.
Frequently Asked Questions
While conducting storm patrol operations due to the intense rainfall unseen in decades, City staff observed unusual erosion in this area. The intense rainfall was washing out the subgrade base material from under the pavement onto the asphalt surface. This type of observed condition is highly unusual and caught the eye of a diligent City employee as it was indicative of roadway compromise. City staff immediately closed the traffic lane pending inspection.
Upon emergency inspection by a City’s Geotechnical Engineer, the engineer recommended the northbound direction remain closed to vehicular traffic. Consequently, staff immediately closed the lane due to public safety concerns regarding erosion under the pavement and water intrusion into the underlying hillside slope. A lane remains closed, and City staff have engaged a Geotechnical Consultant and a Civil/Structural Engineer to conduct further assessment and to provide repair methodologies. This initial assessment work is currently in progress and is anticipated to take several months; however, the repairs and construction are estimated to take longer.
Public safety is our first priority which includes restoring evacuation access as we enter the high fire danger season, and then, restoring full access and a permanent fix. Below recaps what has transpired thus far:
- The City has contracted with a Geotechnical Consultant and a Civil/Structural Engineer to conduct further assessment and provide repair methodologies. This work is currently in progress and is anticipated to take several months.
- City staff are working with our local disaster management organization to comply with all requirements necessary to potentially qualify for state and/or federal funding assistance. The City has declared a local emergency which is required to seek external funding and we are working on alternate funding options in the case external funding is not available. The initial repair estimate is at least $3 million dollars due to the projected need for retaining walls and earthwork; however, the estimates may increase as the engineering analysis is completed.
- While the northbound direction of San Dimas Avenue is anticipated to be closed, in the interim, City Public Works staff are exploring several options to evaluate the feasibility of providing expedited access both in and out of the neighborhood through the remaining lane to alleviate the inconvenience caused by the roadway damage.
- In the interim, we ask that all residents please obey all temporary traffic control signs; they are in place to protect you and your neighbors.
Thank you in advance for your patience and cooperation during this repair/construction process.
Please contact Public Works at (909) 394-6240 or publicworks@sandimasca.gov should you have additional questions.