Folsom Street Off-ramp Realignment Project

  Suggested Alternative Truck Route, March 30 to May 30, 2015.
transparent spacer image Folsom Detour Plan


Beginning on March 30, 2015, construction work on Fremont Street north of Folsom Street will reduce Fremont Street to a single 16-ft wide curbside lane. This will reduce the turn radius for trucks making a right turn from westbound Folsom Street onto northbound Fremont Street. Trucks over 30 feet in length are advised to use Harrison Avenue to access northbound Fremont Street. This configuration is anticipated to last until July 2015.

The Folsom Street Off-Ramp from Westbound I-80 from the San Francisco/Oakland Bay Bridge is closed until June 2015. Motorists are directed to utilize either of two detour options to access Folsom Street:

Option 1: From West-Bound I-80 (From Oakland/Treasure Island) take the Harrison Street Exit and connect with Folsom Street at Fremont Street.

Option 2: From Westbound I-80 (from Oakland/Treasure Island) take the Fremont Street Exit and proceed LEFT at  Fremont Street, turn LEFT onto Howard Street, then turn LEFT onto First Street which will connect with Folsom Street


The Office of Investment and Infrastructure (OCII), successor agency to the San Francisco Redevelopment Agency (SFRA) is sponsoring the modification of the existing Fremont/Folsom Street off-ramp from westbound I-80 via the San Francisco Bay Bridge to function better as a gateway into a pedestrian-oriented neighborhood envisioned by the Transbay Redevelopment Project. As the Congestion Management Agency for the city, the San Francisco County Transportation Authority (SFCTA) is implementing the project on behalf of OCII, overseeing both design and construction of the project.

Existing Folsom Street Offramps

The existing Fremont/Folsom Street off-ramp from I-80 to downtown San Francisco includes one ramp that descends to Fremont Street mid-block between Howard and Folsom Streets at an approximately 90-degree angle and another ramp that descends in a diagonal direction to the intersection of Fremont and Folsom Streets. The former has been in existence for many years, and its design facilitates free left turns to Fremont Street northbound. 

The Folsom Street Off-Ramp Realignment Project will modify both of these ramps in order to facilitate better pedestrian movement and to improve the pedestrian environment. The modified off-ramp terminus will be realigned perpendicular to Fremont Street and all existing right-turn and left-turn movements will be maintained. The new off-ramp T-intersection will include a new traffic signal, which will allow for new continuous sidewalk and Class II bike lanes on the east side of Fremont Street. This realignment will conform to the planned development goals of the Transbay Redevelopment Project Area.


Proposed ramp realignment and intersection improvements

  • Creating the off-ramp configuration to function better as a gateway into a pedestrian-oriented neighborhood.
  • Designing the off-ramp terminus to balance the functional needs of pedestrians, bicyclists, vehicular traffic, trucks and transit and to allow pedestrians comfortable access on both sides of Fremont Street.
  • Providing a new traffic signal at the off-ramp intersection and interconnect with adjacent intersections to increase efficiency.
  • Eliminating the Folsom Street diagonal ramp to allow maximum development of the Folsom-Fremont parcel just south of the ramp.
  • Allowing maximum revenue from the sale of the San Francisco Redevelopment Block 8 parcel, located between the off-ramp and Folsom Street, following its transfer from the California Department of Transportation (Caltrans) to the City and County of San Francisco (CCSF).


The total construction cost for the proposed project is estimated at $4.7 million, including construction management and other support services. In June 2014, the construction contract was awarded to O.C. Jones & Sons, Inc., through a competitive bid process. The proposed project will be funded with OCII funds; it will not utilize any federal or state funds. O.C. Jones & Sons was awarded the contract with a total of 38.3% small business participation, ensuring that small and local businesses will benefit from the economic impact of this project. Construction of the proposed project began in September 2014 and will take approximately ten months to complete. The ramp will remain open during construction to traffic heading to northbound Fremont Street.

Project Capital Costs



Planning and Design $661,000 Transparent spacer image Former San Francisco
Redevelopment Agency
Construction $4,613,000   Office of Investment
and Infrastructure
TOTAL $5,274,000   TOTAL $5,274,000  


Down the latest version of the Folsom Street Off-ramps Fact Sheet.

Additional Information

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Contact Us

Liz Rutman, Senior Engineer, Capital Projects. Send an email or call her at 415.522.4813.