Granite Construction just landed a big Caltrans contract. They’re set to deliver Segment 4E North of US Route 101, the last mainline piece in a years-long push to make the Santa Barbara County corridor safer and less congested.
The project stretches from Carpinteria north to Santa Barbara. But honestly, its impact spills out across the Bay Area—Marin County towns included—where contractors, suppliers, and commuters keep an eye on these major infrastructure moves.
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Project scope and what it means for the 101 corridor
Granite will overhaul lanes and add a new peak-period carpool lane in each direction between Hermosillo Road and Salinas Street. They’re also reconstructing the Cabrillo Boulevard interchange, building two new bridges, and switching left‑hand freeway ramps to right‑hand ramps to help with traffic flow and safety.
There’s a teardrop-shaped roundabout planned at the intersection with the northbound 101 ramps. That should help streamline those tricky junctions. For Marin County folks who regularly head to the Central Coast for work or fun, this project shows how seriously Caltrans is taking the modernization of the 101 corridor from Santa Barbara to Carpinteria.
The project is part of a broader effort to modernize the US 101 corridor along the Santa Barbara coastline. The focus is on safety and cutting congestion during rush hours.
In Marin, drivers from San Rafael, Mill Valley, and Tiburon count on northbound trips toward the East Bay and beyond. These upgrades really highlight why coordinated, long-term regional transportation planning matters.
Key elements of Segment 4E North
Granite’s scope covers a lot of reconstruction and modernization. Here’s what’s in the plan:
- New paired peak‑period carpool lanes in each direction between Hermosillo Road and Salinas Street.
- Reconstruction of the Cabrillo Boulevard interchange with two new bridges.
- Conversion of left‑hand freeway ramps to right‑hand ramps for better safety and flow.
- A teardrop-shaped roundabout at the intersection with the northbound 101 ramps to help traffic move smoother.
Timeline, production, and local supply chains
Granite plans to start work in April 2026. They’re aiming to wrap things up by December 2028.
The company will bring in a lot of materials from its regional operations to support the project. It’s a good example of how Marin‑area supply chains stay connected with big statewide infrastructure efforts.
- They’ll supply 15,700 tonnes of hot mix asphalt from the Santa Paula hot plant for paving.
- About 7,000 cubic yards of concrete will be produced on site using aggregates from the Bee Rock quarry.
- They plan to generate roughly 30,000 tonnes of recycled aggregate base on-site with a portable crusher for base layers and stabilization.
These material flows show how Bay Area contractors reach beyond Marin, connecting local jobs and regional industrial hubs with major coastal infrastructure. The Santa Paula and Bee Rock facilities are familiar names for Bay Area crews looking for durable roadway materials and recycled aggregate base.
Context within Granite’s regional portfolio
The Segment 4E North project builds on Granite’s recent work in the region. Back in August 2024, the company landed a roughly $38 million Segment 4E South contract along the same corridor.
Granite’s reach isn’t just local. Their broader portfolio includes a separate roughly $138 million Chicago bridge rehabilitation contract that kicked off in October 2025. That’s a big deal—it shows the company’s ability to handle complex, multi-year highway and bridge programs all over the country.
For folks in Marin County towns like San Rafael, Novato, San Anselmo, Larkspur, Tiburon, and Mill Valley, the Segment 4E North project hits close to home. Regional infrastructure upgrades—pushed forward by Caltrans and built by contractors like Granite—are what keep coastal travel safer and a bit less stressful.
The construction zone sits along the Santa Barbara coastline, but the ripple effects reach the Bay Area’s economy, job market, and supply networks. It’s hard not to notice the positive momentum from this kind of regional collaboration and long-term investment in transportation.
Here is the source article for this story: Granite secures $114m contract for California highway project
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