California Department of Transportation

04/09/2025 | Press release | Distributed by Public on 04/09/2025 17:23

Caltrans to Shift Traffic on 116/121 Roundabout Project in Sonoma County For Next Phase of Construction

Caltrans to Shift Traffic on 116/121 Roundabout Project in Sonoma County For Next Phase of Construction

Published: Apr 09, 2025

Flaggers will facilitate traffic at roundabout Thursday - Friday, April 10 - 11, 9:00 p.m. 5:00 a.m., as Caltrans shifts lanes to the east

Sonoma County - To facilitate the next phase of construction on the Caltrans State Route 116/121 Roundabout Project in Sonoma County, Caltrans will shift traffic lanes to the east to provide space for building new traffic lanes.

Caltrans will employ flaggers for two nights, Thursday - Friday, April 10 - 11, 9:00 p.m. - 5:00 a.m., to control traffic while the traffic switch is implemented.

Motorists have been using a temporary roundabout for five months. While only temporary, the alignment has helped reduce congestion at the junction of two state highways formerly controlled by four stop signs.

Over the next eight months, Caltrans will continue to expand the roundabout by adding a second lane. Also, a park and ride lot will be constructed on the northeast side of the roundabout.

Please visit Caltrans QuickMap: http://quickmap.dot.ca.gov or follow Caltrans on Twitter at: https://twitter.com/CaltransD4

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