A multi-million-dollar project to help protect Sacramento from flooding is facing a significant setback. CBS13 is learning that there are problems with the ground where the new Sacramento weir is being built.

For more than 100 years, the Sacramento weir has helped protect the region during strong winter storms.

"It diverts that water away from our urban areas where there's the most risk within our system and it pushes it into the bypass," said Todd Bernardy, principal engineer with the California Department of Water Resources.

Bernardy helps manage the state's network of weirs.

"These are very, very good tools to have in our toolbox to protect nearly 780,000 people who live in the floodplain," he said.

In 2023, the U.S. Army Corps of Engineers began expanding the weir by an additional

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