Work to replace the Niles Boulevard Bridge connecting the City of Fremont and Union City is progressing since construction began last October. Spanning over Union Pacific and BART rail lines, the existing bridge is being replaced to meet current seismic and design standards. The new bridge is being built immediately south of the existing bridge, allowing it to remain open during construction. Construction is anticipated to be complete spring 2017.
Since October, dirt grading, fill and excavation work has taken place. In addition, shoring and pile driving on the east and west sides of the bridge was completed in February. Looking ahead, Cast-in-Drilled Hole (CIDH) Piles, which are used to support structures built on ground subject to movement, are anticipated to be installed beginning in March. This activity will require weekday night and weekend night work due to the CIDH piles being located in between the BART and Union Pacific rail operations (tracks). Because the CIDH piles will be drilled into place, noise levels are anticipated to be lower than those encountered when piles are driven into place.
Project Construction Hours
The majority of project construction is anticipated to take place during regular weekday hours, from 7:30 am to 4:00 pm. However, there may be instances where weekday construction hours are extended from 7:00 am to 7:00 pm in order to expedite or complete ongoing work. Saturday work hours are from 9:00 am to 5:00 pm, if needed. Some work may extend into Sunday to complete ongoing work, or to make up for any delays caused by adverse weather.
Due to existing BART and Union Pacific restrictions, work taking place directly over or adjacent to BART and Union Pacific Railroad tracks needs to be performed at night and/or on weekends when the trains are not in operation. Regular weekday night hours—when this type of work can take place—are from 1:30 am to 3:00 am. Weekend night hours for this type of work are from 1:00 am to 7:00 am. All construction dates and times are subject to change due to weather and unforeseen conditions.
The maximum noise limit allowed for the project is 86 Decibels (dB) at a distance of 50 feet. More information regarding the City of Fremont’s Municipal Code for allowable construction hours can be found by visiting our full code online. Click on “Title 18 Planning and Zoning” on the left side of the browser page and select “Chapter 18.160 Construction Hours.” Some of the work taking place over or adjacent to the BART and Union Pacific Railroad tracks may exceed the construction noise limit. This work must be performed when the trains are not in operation and will be completed as quickly as possible.
Community members should also be aware that train horns may be heard near the project site during regular construction hours. Train operators are required to sound a warning as they pass through a known construction zone.
Advance notice of night, weekend and/or noisy work activities will be provided to the local community (when the work is scheduled) through the project website, email notification, and portable message boards set up in both directions of traffic near the bridge. As with any major construction project, it is important to note that estimated work dates and times are subject to change due to weather, unforeseen conditions, and/or the availability of on-site Union Pacific Railroad flaggers and BART safety monitors.
Sign up for Construction Updates
Project information and construction updates are posted on the project website. Community members are encouraged to sign up for regular updates on the website, by sending an email, or calling the project Construction Info Line at 510-355-1502. Please share this information with others who might be interested in receiving future updates.