The Three Rivers Levee Improvement Authority, a joint powers agency, was established in May 2004 by the County of Yuba and Reclamation District 784 to finance and construct levee improvements in south Yuba County.
The Authority’s mission is to provide 200-year flood protection for south Yuba County. Four work phases were identified to achieve that goal, with the Feather River Levee Improvements representing the bulk of the fourth phase. In 2011 , the Yuba Goldfields area was added to Phase 4 work due to flood issues being identified by the USACE. The Yuba Goldfields 100-Year Interim project was completed in 2016 and a new setback levee, the Yuba Goldfields 200 Yr Levee Project, is beginning construction this year and due to be finished in 2021. This new project will meet the 200 Year Urban Levee Design Criteria (ULDC). In total, more than $500 million is being invested in flood protection improvements, approximately half of which is being paid for by the State.
The Authority operates under a five-member Board of Directors.