The Sacramento Metropolitan area is one of the most at risk areas for flooding in the United States due to its location at the confluence and within the floodplain of two major rivers. The 1997 Sacramento flood events revealed deep under-seepage on the Sacramento River, including in areas that were remediated to address through-seepage with shallow cutoff walls in the early 1990s.
We are currently underway with construction on Sacramento River East Levee Contract 1, which includes construction of approximately 3 miles of levee improvements--to include a combination of seepage cutoff walls and seepage berms--at 5 locations along the Sacramento River East Levee. Site preparation was completed in January 2020, and levee construction is scheduled to continue through December 2020.
A 400-foot-long seepage berm was constructed earlier this year on the landside levee adjacent to Front St, wrapping up in January 2020. In total, the American River Common Features 2016 project is expected to construct approximately 9 miles of slurry cutoff walls along the Sacramento River East Levee, and will add erosion protection at a number of locations.