Another small piece of the Sonoma-Marin Narrows Highway 101 project opened this morning. Caltrans said the northbound off-ramp at the new Petaluma Boulevard South/Kastania Road interchange is now open to traffic.

The interchange is now three-fourths open, with only the northbound on-ramp left to be completed. Crews continue to work on the new frontage road, extending Petaluma Boulevard South along the east side of the freeway. Farther south in Marin county, the new interchange at the Redwood Landfill is nearly complete with only the southbound off-ramp left to open. That project, including a new bike path through the Narrows, is expected to be completed next month.

And preliminary work is underway at the county line to build a new freeway bridge over San Antonio Creek. Crews are moving utility lines and trimming trees in preparation of the project to begin next year.

The Sonoma County Transportation Authority has a new, updated table showing all of the Narrows projects, their completion status and the amount of funding needed to complete the widening of the freeway through the corridor. The project is still $250 million short.