09 November 2012 ~ 1 Comment

Construction update: New traffic configuration starting in North Beach, full closure of 4th Street implemented under I-80 overpass

Construction at the site where tunneling will begin next year.

Along the Central Subway Project alignment, tunnel pre-construction has continued to progress at the four active construction sites. Since our last update, crews have completed construction of a sewer manhole and a sewer line in North Beach, and a portion of 4th Street has closed to facilitate construction of a major excavation known as a launch box at the site where tunneling will begin next year.

This construction update covers construction that will be underway from Saturday, November 10, until Wednesday, November 21. We will post an additional update soon with information about construction during the holiday season.

In the next week and a half, work will continue at the four active Central Subway construction sites, with traffic impacts planned to change at the following location:

  • North Beach Utility Relocation (Columbus Avenue between Union and Filbert streets): The contractor plans to begin work on the western (southbound) side of Columbus Avenue on Tuesday, November 13. The right lane for southbound traffic will be closed during construction hours (Monday to Friday, 7 a.m. to 3:30 p.m.). To facilitate construction, the southbound bus stop on Columbus Avenue at Union Street will be closed during construction hours. The nearest alternate bus stop for the 30 Stockton is on Columbus Avenue at Filbert Street. The nearest alternate stop for the 8X/8BX Bayshore Express is on Powell Street at Filbert Street. ***Update November 13: In North Beach, the contractor will no longer begin work on the western side of Columbus Avenue today. Work will continue on the eastern side of the street and in the median. The left lane for northbound traffic and the northbound bus stop on Columbus Avenue at Union Street will remain closed during construction hours. Both southbound lanes of traffic and the southbound bus stop on Columbus Avenue at Union Street will remain open.***

Construction at the site in SoMa where tunneling will begin next year.

Here’s what to expect in the next week and a half as tunnel pre-construction continues in SoMa, Union Square and North Beach:

  • Tunnel Launch Box (4th Street between Bryant and Harrison streets): The contractor will continue constructing below-ground walls around the perimeter of this major excavation site. In addition, at the southern end of the block, crews are building a structure that will support the decking that will eventually cover the launch box, allowing traffic to travel over the excavation. To facilitate construction, this block of 4th Street is closed to all vehicle traffic. The on-ramp to westbound I-80 may be closed on weeknights from 8 p.m. to 4 a.m. and all day Saturday and Sunday. The sidewalk on the east side of the block remains open to pedestrians, and traffic and pedestrian controls are in place. For more information on construction impacts near this site, please check out this construction notice.
  • Yerba Buena/Moscone Station Tunnel Pre-Construction (4th Street between Folsom and Howard streets):  The tunneling contractor will continue preparing to install below-ground walls, called headwalls, at the site of the future Yerba Buena/Moscone Station. The walls will cross 4th Street at two points on this block. At least two lanes of traffic on 4th Street will remain open at all times. The contractor plans to remain on the eastern side of the street until November 21, with two lanes on the west side of the street (right lanes for southbound traffic) open.
  • Union Square Tunnel Pre-Construction (Stockton Street between Ellis and Geary streets and Ellis Street between Stockton and Powell streets): The contractor will continue preparing to construct below-ground walls at the future site of the Union Square/Market Street Station. Stockton Street between Ellis and Geary streets will remain closed to all traffic except emergency vehicles. Ellis Street between Powell and Stockton streets will remain closed to westbound traffic. Sidewalks in the area will remain open to pedestrians. For more information about the traffic modifications now in effect in the Union Square area, check out this blog post.
  • North Beach Utility Relocation (Columbus Avenue between Union and Powell streets): The contractor will continue with utility relocation. On Monday, November 12, the left lane for northbound traffic will be closed during construction hours. Starting Tuesday, November 13, the work area will shift to the southbound side of the street. The right lane for southbound traffic will be closed during construction hours (Monday to Friday, 7 a.m. to 3:30 p.m.).  To facilitate construction, the southbound bus stop on Columbus Avenue at Union Street will be closed during construction hours. Signage will be in place directing Muni customers to the closest alternate bus stops. For more information on construction in North Beach, check out this blog post. ***Update November 13: In North Beach, the contractor will no longer begin work on the western side of Columbus Avenue today. Work will continue on the eastern side of the street and in the median. The left lane for northbound traffic and the northbound bus stop on Columbus Avenue at Union Street will remain closed during construction hours. Both southbound lanes of traffic and the southbound bus stop on Columbus Avenue at Union Street will remain open.***

We also post construction, auto detour and Muni impact information on our project Google Map.

We appreciate your continued patience while construction is in progress.

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