TICD Opens Forest Road Detour road on August 20th

YBI Macalla Road will close for 18-24 months

Overnight on Sunday August 19th into Monday August 20th, TICD will open a new Forest Road Detour road on Yerba Buena Island to carry motorists from the Bay Bridge Westbound off-ramp to Hillcrest Road.  From Hillcrest Road, motorists will continue along Treasure Island Road to reach Treasure Island.  At the same time, TICD will close Macalla Road for widening and reconstruction work.  Forest Road Detour road will remain in use over the next 18 to 24 months during the widening and reconstruction of Macalla Road.  The Island community can expect the following impacts and changes: 

Click here to jump to Forest Road Detour road diagram

Click here to view and download the 08-16-16 TICD Construction Advisory for this work

Click here to view and download the Community Advisory for YBI traffic control on Monday August 20th.

Overnight Sunday August 19th into Monday August 20th:

  • Forest Road Detour road opened to carry two-way traffic between Northgate Road and Hillcrest Road providing access to/from the new Westbound On/Off Ramps and United States Coast Guard.
  • Macalla Road will close to all vehicle, pedestrian and cyclist traffic between Northgate Road and Treasure Island Road.
  • NOTE: The Bay Bridge Westbound YBI Off-Ramp will NOT close overnight as part of this traffic switch.
  • Please expect additional traffic control on Treasure Island Road (at Macalla Rd.) and on Hillcrest Road throughout the day on Monday August 20th.

New Yerba Buena Island traffic circulation as of Monday August 20th:

  • There is no regular impact to the Bay Bridge YBI on-ramps and off-ramps.
  • There is no regular impact to the MUNI-25 Treasure Island bus route.
  • All other currently open YBI streets will remain open.
  • Motorists should expect additional traffic control and road work along Forest Road Detour road for the next several months after the initial August 20th opening. 
  • Motorists and cyclists should expect increase in two-way traffic along Hillcrest Road.
  • There are no bicycles or pedestrians allowed on the new Forest Road Detour road.
  • There is no impact to the bicycle route between Treasure Island and the Bay Bridge pedestrian/bicycle path trailhead or the YBI Vista Point.
  • From Treasure Island, motorists wishing to reach the new Westbound On-Ramp east of the Bay Bridge tunnel, or other destinations on YBI, will need to take this Forest Road Detour road over the top of YBI to Northgate Road.
  • Cyclists and vehicles will share the road through the impacted areas on Hillcrest Road and Treasure Island Road.

Image of map of current road closures and detour roads on Yerba Buena Island