A Caltrans map of the proposed remodeled interchange at the Redwood Landfill north of Novato along Highway 101. Click to enlarge

Work is scheduled to start this fall on a project that will begin to reshape Highway 101 just south of the Sonoma-Marin County line.

The state  Transportation Commission last week approved $29.7 million for remodeling of the interchange at the Redwood Landfill and  construction of frontage roads that will eliminate intersections with San Antonio Road, Olompali State Historic Park and a few private driveways.

Dianne Steinhauser, executive director of the Transportation Authority of Marin, said one of the frontage roads will run along the westside of 101 from San Antonio Road to the Redwood Landfill interchange. A second will be an extension of Redwood Boulevard from Novato to Olompali, and a third will be on the eastside of 101 from Redwood Landfill south to the existing driveway of Mira Monte marina.

Still to ironed out is purchase of some dairyland along the freeway for the San Antonio frontage Road. Steinhauser said Caltrans and the dairy owner haven’t agreed upon a price and Caltrans is proceeding with condemnation action.

The project is estimated to cost a total of $76 million, including design, relocation of utilities and environmental mitigation. Completion is scheduled for 2015.

The work won’t include widening 101 to three lanes in each direction. That eventually is expected to happen as part of Caltrans’ Novato Narrows project.

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