South San Francisco Bridge Replacement

City of South San Francisco | 2018

VSCE teamed with Biggs Cardosa (BCA), who was the prime consultant for the replacement of the existing bridge over San Bruno Canal along South Airport Boulevard at North Access Road and I-380 on-ramp.

The South Airport Boulevard Bridge over the San Bruno Canal at North Access Road and the 380 Freeway on ramp needed to be replaced due to its deteriorated condition. The initial bridge was built in 1949 on wood piles. In 1975, the bridge was widened, and the new sections were supported on concrete piles. The City with the assistance of Caltrans was successful in obtaining funding from the Federal Highway Administration (FHWA) for the new design and construction costs. The bridge was rebuilt in a single stage as multiple stages of construction was ruled infeasible due to damaged piles. Traffic was managed by developing a detailed traffic control and detour plan, signal control plan, and coordination with First responders, Caltrans, the community and businesses. Due to California Department of Fish & Wildlife regulations, work was limited in the creek and riparian zone from April 15 to October 31 each year. In order to comply with these regulations and to maintain traffic on South Airport Boulevard, the bridge was originally planned to be replaced in two consecutive spring and summer seasons. However, the City decided to close the bridge due to the deteriorated conditions of piles supporting the structure.

VSCE assisted BCA in re-planning the construction sequence into a single stage construction and accelerate the completion date. In addition, VSCE partnered with BCA to perform roadway construction inspection, traffic management, and community outreach activities. The new bridge is a cast-in-place post-tensioned voided concrete slab supported on 30 steel pipe piles. The bridge simple span dimensions are 63 feet long by 107 feet wide over the San Bruno Canal.

BUDGET CONTROL:

The contractor provided a re-quote of costs due to the change in construction staging from four stages to one stage. The cost was negotiated and finalized.