San Gabriel Streets Show Remarkable Improvement, with Pavement Condition Index Rising from 52 to 82

San Gabriel's streets have shown vast improvement within the past four years - with our Pavement Condition Index score rising from 52 in March 2018 to a remarkable score of 82 this year.

What is the Pavement Conditions Index?

The Pavement Conditions Index (PCI) provides a snapshot of the pavement health of a road. This study is performed every three years by an independent agency, rating the city's street conditions on a scale of 0 (a completely failed road) to 100 (a newly paved road).

How Do We Compare to Other Surrounding Cities?

- San Gabriel (2021): 82

- Alhambra (2020): 77

- Monterey Park (2019): 66

- Rosemead (2020): 76

- Temple City (2019): 58

What Changed? New Method?

Since 2018, the repaving process generally consisted of complete demolition and replacement of the worst-condition streets, which costed more than $1 million per mile. This method proved to be very costly, and we did not have the funds to properly address the issues.

After evaluating repair alternates, we switched our 2020 paving plan to utilize ARAM (Asphaltic Rubber Aggregate Membrane) and Slurry Seal processes, which do not require complete demolition of the existing roads. By 2020, we were able to perform surface treatment to over 12 miles of medium-condition streets for only $1.5 million. Preserving our medium-condition streets and not allowing them to become our worst-condition streets is an important step towards improving San Gabriel's entire street network. This method has proven to be very efficient, costing one-tenth of what it would have cost to replace a worst-condition street.

In 2021, we completed our largest street restoration project that ground down the edges of the streets and installed a new 4" rubberized asphalt street on top of the old street. Upon grinding down the edges, we discovered that nearly every residential street consisted of only about 2" thick of asphalt over dirt. This is insufficient for a public street and much thinner than an average driveway. Instead of fully replacing the street, we went ahead with the 4" rubberized asphalt process, which is more cost-effective. By doing so, we also received a $250,000 grant to incorporate recycled rubber from car tires into the asphalt. The rubber adds flexibility and results in a smoother quieter riding surface. It is also designed to withstand years of traffic and weather forces, and adds an estimated 15 years of useful life.

Using this street restoration method, we now have proper high-quality streets that have greatly reduced maintenance costs, and a very long useful life.

What's Next?

This year, we will launch another large-scale paving project to address many more poor-condition streets, including Hermosa Dr, Coolidge Dr, Gerona Ave, Alabama St, N California St, W Saxon Ave, and W Ramona Blvd, and almost all alleys. SB-1, also known as the Road Repair and Accountability Act of 2017, will provide an estimated $910,533 to improve these streets in this fiscal year 2022-23. There are also many other grants, totaling over $5 million, that will be used.

Walnut Grove Ave & E Broadway, which is partly owned by the County of Los Angeles, is also on our radar. We are actively working on the issue and hope that repaving will begin in 2023 in a joint project managed by the county.

Want to Learn More or Have Questions?

Come join our community sessions "411 with the Chief featuring Public Works" every second Tuesday of the month, and meet our public works director in person.

Find out more by watching the Street Pavement Presentation.

Want to learn more about SB-1? Read the staff report here.

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