Five-Way Intersection Project
About the Project
The City is seeking to improve the safety and level of service at one of its major intersections, known as the “Five-Way Intersection”. The Five-Way Intersection is located on the eastern side of the City and is the convergence of Silverado Trail (State Route 121), Third Street, East Avenue and Coombsville Road.
City staff held a series of meetings to obtain input from the community, discuss potential design alternatives and consider potential impacts to surrounding property owners.
Because Silverado Trail is a State Highway (Route 121), the City has partnered with Caltrans and the Napa Valley Transportation Authority (NVTA) to develop a project to improve the intersection. With this partnership, the City is responsible for the public outreach and developing design concepts, Caltrans will be responsible for the detailed design and construction of the project, and NVTA will provide local support and funding coordination.
City Council Meeting
City staff conducted public outreach meetings, evaluated multiple alternatives and developed the design concepts analyzed in a Caltrans Project Study Report – Project Initiation Document (PID). The Draft PID document was presented to City Council for their consideration and recommendation of an alternative at the scheduled City Council meeting on February 7, 2017. Following the City Council meeting, Public Works staff delivered the Draft PID document to Caltrans.
Caltrans will finalize the document and begin the design process. The PID document also provides the information necessary to make the project competitive for federal, state, and regional funding.
The recommended alternative is a double-roundabout configuration with a 4-leg roundabout to the north to serve Third Street, Silverado Trail and East Avenue and a 3-leg roundabout to the south to serve Silverado Trail and Coombsville Road. This alternative design, known as “Option 5F” provides traffic access for all street approaches of the intersection.
This design meets three core goals: 1) Improve safety for all modes of transportation, 2) Provide additional facilities for bicyclists and pedestrians, and 3) Improve the Intersection Level of Service (e.g. reduce traffic delay) at the Five-Way intersection.