Analysis of levees surrounding the City of West Sacramento basin has suggested that some levees may provide a lower level of flood protection than previously estimated. In particular, these findings suggest that Regional San’s South River Pump Station (SRPS), located in an undeveloped agricultural basin in Clarksburg, needs an increased level of flood protection.
Construction of the South River Pump Station began in 2004 and service began in 2007 as part of the Lower Northwest Interceptor Project (LNWI) for Regional San. The LNWI services thousands of residences and businesses in the Natomas area of the City of Sacramento, unincorporated areas of the County of Sacramento, the City of Citrus Heights, and the City of West Sacramento.
The South River Pump Station was constructed within Reclamation District 765, in an area protected on four sides by levees. At the time, the levees were thought to provide 400-year flood protection. However, a study conducted by the U.S. Army Corps of Engineers (Corps) in 2002 led to additional evaluation of Sacramento area levees.
Subsequent studies indicated that the levees do not meet the state or federal flood protection criteria. Likewise, planned flood protection improvements do not extend past the city limits of West Sacramento. Should a significant flood event, 100-year storm or greater, occur at the SRPS, sewer service could be interrupted and cause upstream damage to the infrastructure and the environment.
The SRPS Flood Protection Project will consist of constructing a new 200-year flood protection levee and raised all-weather access roads around the existing pump station. The top of the new levee will be approximately 22 feet above existing ground and will require 400,000 cubic yards of levee borrow material. Once completed, the levee will be approximately 5,000 feet in total length.
Project construction will include a significant operation to import soil (borrow) material for construction of the flood protection system. The project plans to obtain borrow material from within the surrounding basins.
Regional San’s Board of Directors certified the project’s final Environmental Impact Report in September 2012. Construction is anticipated to begin in summer 2017.
Level of flood protection
Raised access road length
Embankment height above existing ground
Borrow material required
400,000 cubit yards
What to Expect During Construction
Unknown at this time.
Other Possible Impacts
Throughout construction, the project team will do everything possible to minimize impacts to the community. However, certain disruptions may be unavoidable, such as increased noise and dust.
Maintaining communication with residents throughout the construction process is very important to Regional San. We encourage you to check this webpage for updated information.
If you’d like to speak with someone regarding an issue or impact, please call Scott Mueller at (916) 876-6399.
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