The U.S. Army Corps of Engineers is funding expansion of the Sacramento Weir. The approximately $350 million project involves widening the 1,950-foot weir an additional 1,500 feet north. 

The weir's 48 manually-operated gates will remain intact. The expansion is constructing a passive weir to essentially allow excessive floodwaters to flow over the river channels and into the bypasses -- in turn widening the surface area, and meaning the Sacramento Weir will be used less frequently for more severe flood events. 

The Corps, Central Valley Flood Protection Board, California Department of Water Resources and the Sacramento Area Flood Control Agency plan to break ground on the Sacramento Weir expansion project in 2021, and estimate the project to be complete in 2023.