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Lower Berryessa Creek

Lower Berryessa Creek Flood Protection Project

The Santa Clara Valley Water District's Berryessa Creek Flood Protection Project, when completed, will protect 2,447 parcels in Milpitas from the threat of a 100-year flood event, which has a 1-in-100 chance of occurring in any given year. The Berryessa Creek Flood Protection Project includes both the Upper Berryessa Creek portion and the Lower Berryessa Creek portion. For more information on the Upper Berryessa Creek portion, click here.

The Lower Berryessa Creek portion of the project, which includes Calera and Tularcitos creeks, will protect 1,823 properties in Milpitas, between Milpitas High School and E. Calaveras Boulevard (north to south) and the Union Pacific Railroad to Highway 680 (east to west).

FEMA-certifiable improvements are planned about 1.7 miles through Milpitas, from its confluence with Lower Penitencia Creek, south to Calaveras Boulevard. Improvements would also occur along 2.1 miles of Calera and Tularcitos creeks, two smaller creeks that flow into Berryessa Creek. The project will build floodwalls, improve levees, widen the creek channel to accommodate high flows, and enhance and enlarge tidal and freshwater wetlands and riparian habitat.

The Lower Berryessa Creek portion is underway in three phases:

Phase 1 (yellow area on the map below)
This phase stretches from the confluence at Lower Penitencia Creek (approximately 400 feet south of Milmont Drive Bridge) to Abel Street. The flood protection improvements for this phase include earthen levees on the east side of the creek and artificial floodwalls on the west side of the creek, as well as an enhanced tidal and freshwater wetlands area. Construction of Phase 1 was completed in December 2016. Plant establishment work will continue through December 2021.

  • Typical cross section of Phase 1 channel improvements (facing east)
    Click image to enlarge
    /uploadedImages/Services/FloodProtection/Projects/Lower_Berryessa_Creek_Flood_Protection_Project/Lower-Berryessa-Creek_Cross-Section.jpg

Phase 2 (orange area on the map below)
This phase stretches from Abel Street to Calaveras Boulevard. The flood protection improvements for this phase include earthen levees on the north side of the creek and artificial floodwalls on the south side of the creek, as well as enhancing riparian habitat. Construction of Phase 2 began in 2016.

Phase 3 (red area on the map below)
This phase includes a portion of Calera Creek and Tularcitos Creek. Work on these creeks will take place following completion of Phases 1 and 2.

Lower Berryessa Creek Map (Phase 1,2,3)

View the Lower Berryessa Creek Project fact sheet (PDF).

What to expect during construction

Construction work hours for Phase 2 are 7 a.m. to 7 p.m., Monday through Friday, with occasional Saturday work. Expect typical construction noise during work hours as trucks and crews access the creek at Milmont Drive. Truck hauling will occur only between the hours of 9 a.m. and 4 p.m. A minimum of one lane in each direction will remain open throughout the project, but flaggers may be used for traffic control. Smaller equipment, such as pickup trucks, could access the project site at Milmont Drive.

Equipment can include backhoes, excavators, jackhammers, compactors, loaders, dump trucks, drill rigs, pumps, portable sediment and/or water basins, and concrete pump trucks. The contractor may use a generator to pump water around the project site and back into the creek farther downstream. Expect typical construction conditions such as noise, dust, roadway traffic, lane reductions and truck traffic.

 


About the project

The Lower Berryessa Creek Flood Protection Project extends approximately 1.7 miles through the city of Milpitas, from its confluence with Lower Penitencia Creek, south to Caleveras Boulevard. The project also includes about 2.1 miles of Calera and Tularcitos creeks. These two smaller creeks are tributaries to Berryessa Creek and must also be modified to prevent water from overflowing their banks. When complete, this project will protect vast portions of the City of Milpitas from flood events.  

Fact sheets covering the proposed projects are available here:

Lower Berryessa Creek

Calera Creek

Tularcitos Creek

Planning and environmental documents for this project can be found in the "Meetings and Notices" section for this project page linked at left. 

For more information:

  • Contact Public Information Representative Kristen Yasukawa at (408) 630-2876 or by email at kyasukawa@valleywater.org
  • Use “Access Valley Water” to submit questions, complains or compliments directly from your computer to a water district staff person who can help you. Click on the "Projects or work going on in my neighborhood" tab and select "Berryessa Creek (lower) flood protection project - Lower Penitencia Creek to Calveras Blvd."
  • Sign up to receive project updates via email.