Completion of the Highway 101 Marin-Sonoma Narrows widening project is getting closer as construction continues.
The project includes widening US-101 to install High Occupancy Vehicle (HOV) lanes for 3.5 miles along the northbound lanes from North Novato to the Marin-Sonoma line, and for 6.3 miles along the southbound lanes from De Long Avenue to the county line. HOV lanes are scheduled to be open to use this summer, according to Caltrans.
The next phase of work will see the Atherton Avenue and De Long Avenue on- and off-ramps on southbound US-101 closing from Monday, July 21 to Friday, July 25 from 8 p.m. until 5 a.m. the next morning. As many as two lanes are scheduled to be closed in the area as well. At least one lane will be open for traffic. All work depends on weather. Daytime access will be available for drivers.
This is the last remaining HOV lane construction project as part of the 16-mile US-101 Marin-Sonoma Narrows program. The project will complete and allow continuous HOV lanes on US-101 from Sausalito in Marin County to Windsor in Sonoma County.
MTC has long identified improvements to the U.S. 101 corridor in the North Bay as an important regional priority, including the Marin-Sonoma Narrows, where lanes narrowed from three to two creating bottlenecks. The work expands lanes from four to six, adding a carpool lane in each direction.
MTC has also contributed $15 Million in re-purposed federal earmarks, another $15.4 Million in STP funds and $23 Million in RTIP funds, and monies from the Prop 1B Corridor Improvement program, among other dollars to the overall widening project. Caltrans, the Transportation Authority of Marin and the Sonoma County Transportation Authority are partners on the project.
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