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Solution to Highway 101's biggest bottleneck at least seven years away

  • Traffic on the Novato Narrows in 2002. (PD FILE, 2002)

On the day the new Graton Resort & Casino opened last week, northbound traffic on Highway 101 backed up from Rohnert Park all the way to Novato. It took drivers an hour to travel just 22 miles.

The casino is expected to add up to 10,000 vehicles per day to the already overburdened artery, highlighting the need to complete a long-planned Highway 101 overhaul, widening bridges, reconfiguring interchanges, and other improvements.

“A traffic generator like the casino makes this project even more important,” said Dianne Steinhauser, executive director of the Transportation Authority of Marin. “It emphasizes the need to do it.”

Much of that work will be completed by 2017.

But even after all the improvements, the worst bottleneck in the area will remain: the freeway will still narrow from four lanes in Marin County down to two lanes from north of Novato to Petaluma. A lack of funding will leave that 10-mile gap in carpool lanes for at least seven more years, transportation officials say, and frustrate commuters who battle heavy daily traffic between Sonoma and Marin counties.

Thirteen years after embarking on the project to improve Highway 101 from Highway 37 in Novato to Windsor River Road — a nearly 40-mile stretch — construction crews are working on the last section between Petaluma and northern Novato known as “The Narrows.”

The projects underway include improving all four interchanges in Petaluma, widening the overpass at Redwood Landfill, adding frontage roads through The Narrows, closing off unsafe highway access points, and widening the bridges over the Petaluma River and Highway 116. All of the work will be completed by 2016.

A future project to realign the freeway and build a new bridge over San Antonio Creek at the county line is fully funded and will break ground in 2015 with a two-year timeline.

When all the work is complete, the freeway will be safer and more modern, but no wider than it is today. Funding for the last piece — a carpool lane in each direction from northern Novato to Old Redwood Highway in Petaluma — is still $250 million short, and officials don't know when it will come, or even who will pay.

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