Caltrans District 4 San Mateo County Newsletter

Work Continues on El Camino Real (SR-82)

As part of the El Camino Real Roadway Renewal Project, Caltrans continues to make progress along the El Camino Real (SR-82) corridor between the cities of Millbrae and San Mateo. This Fall, crews are preparing for the next phase of streetscape improvements, including planting new trees along the corridor between Grove and Oxford avenues.

Trees removed as part of construction will be replaced with new saplings selected to complement the corridor, including Emerald Elm, Lemon-scented Gum, Triumph Elm and Mountain Gum trees. These plantings will help maintain the historic greenery along El Camino Real as construction progresses.

With the school year underway, traffic is currently reduced to one lane in each direction on El Camino Real near McKinley Elementary School, with the current configuration expected to remain in place through winter 2026.

Watch the video below for an overview of the current traffic changes and detour routes:

State Route 1 Multi Asset Project Update

The Highway 1 Multi-Asset Roadway Rehabilitation Project, led by Caltrans District 4, is a major effort to renew and improve a critical stretch of State Route 1 between Moss Beach and Half Moon Bay.

Crews are wrapping up final paving through August 2026, with permanent striping and guardrail installation to follow. At the Pilarcitos Creek Bridge in Half Moon Bay, crews are strengthening the bridge foundation, while drainage improvements along the corridor will help protect the roadway from water damage and reduce pooling and hydroplaning.

Beyond addressing infrastructure that is nearing the end of its service life, the project incorporates new safety improvements in alignment with Caltrans’ commitment to Complete Streets, helping create a safer and more resilient State Route 1 for everyone who travels along the coast.

State Route 1 Creek Bridge Project Utilizing Retaining Walls for Erosion Control

Caltrans has begun a seismic restoration project at the San Gregorio Creek Bridge on State Route 1 (Cabrillo Highway) in unincorporated coastal San Mateo County, just south of State Route 84.

The project will strengthen the bridge and address erosion along San Gregorio Creek, including construction of a new retaining wall to help protect the roadway and bridge infrastructure. As this work gets underway, signalized one-way traffic control has been implemented on State Route 84 near La Honda to accommodate construction activities.

What is a Retaining Wall?

Retaining walls are structures built to hold back soil and stabilize the ground, often allowing roads to be safely built alongside hillsides, slopes and other uneven terrain. They help prevent soil from shifting or eroding into the roadway, particularly during heavy rain and other conditions that can weaken slopes.

Along State Route 1, retaining walls are an important part of protecting the roadway and surrounding infrastructure. By stabilizing slopes and reducing erosion, they help keep this vital coastal route safe and reliable for the communities and travelers who depend on it.

Setting the PACE: Public Affairs Customer Engagement Site is Now Live!

District 4 is proud to announce the launch of our new Customer Service Request (CSR) platform. PACE, the Public Affairs Customer Engagement site, provides a regularly updated breakdown of services requested and rendered across the district.

• The CSR dashboard aims to provide an overview of the responsiveness to maintenance services requested across the nine Bay Area counties.
• The data represented as month-to-date falls within a rolling 30-day Service Level Agreement (SLA) and is updated weekly.
• We strive to close 60% (or more) of all monthly service requests received via the CSR website portal.
• For more information or to leave comments/suggestions, please contact D4CSLTEAM@dot.ca.gov.
• To report a highway issue/problem, please submit a CSR ticket through the Customer Service Request Form.

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Crew Performing Pavement Work