Lower Berryessa Creek Project, Phases I and II, Santa Clara Valley Water District – Milpitas, CA
The Lower Berryessa Creek Flood Protection Project provides 100-year flood protection to over 1,800 homes, schools and businesses in the City of Milpitas.
Phase 1 included work on Lower Berryessa Creek from Penitencia Creek to Abel Street, for a total length of 2,400 feet. The project raised the existing levee on the southwest bank and replaced the levee on the northwest bank with concrete floodwalls.
Phase 2 included improvements to Lower Berryessa Creek from Abel Street to Calaveras Boulevard, for a total length of 6,000 feet. The project raised levees, constructed concrete floodwalls with either cast-in-drilled-hole (CIDH) piles or spread footing foundations, raised a pedestrian bridge, constructed transition structures, headwalls and access roads consisting of articulated concrete blocks.
The project required permits from numerous agencies, including the U.S. Army Corps of Engineers, California Department of Fish and Wildlife, San Francisco Bay Regional Water Quality Control Board, the City of Milpitas, Union Pacific Railroad, San Francisco Public Utilities Commission and the Santa Clara Valley Transportation Authority. The project required close coordination with the adjacent property owners.
One of the challenges on the project was coordinating the work with the adjacent BART extension project, which was under construction by the Santa Clara Valley Transportation Authority. Another challenge was due to the utility relocation work that was supposed to have been completed prior to construction. This delay would have pushed the construction into a fourth season, but Ghirardelli staff worked with the contractor to re-sequence and accelerate the work in order to complete the project on schedule.