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Three Rivers Levee Improvement Authority (TRLIA)

Three Rivers Levee Improvement Authority (TRLIA) is a Joint Powers Agency focused on flood control improvements in southern Yuba County. Their goal is to achieve a 200-year level of flood protection by completing major flood protection elements by 2008. The project is currently in progress, with approximately 50% of the work done. The remaining work will be completed in 2007 and 2008, with a total estimated cost of over $200 million. The project includes the construction of new levees, as well as the creation of riparian and upland habitats.

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Three Rivers Levee Improvement Authority (TRLIA)

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  1. Three Rivers Levee Improvement Authority (TRLIA) Briefer: Mary Jane Griego, TRLIA Board Member Three Rivers Levee Improvement Authority March , 2007

  2. What is TRLIA? • A Joint Powers Agency comprised of Yuba County and Reclamation District 784 • Created in 2004 to aggressively focus on Flood control improvements in southern Yuba County • Unique Relationship with Development Community • Governed by TRLIA Five Member Board • Goals • Achieving at least a 200 year level of flood protection for south Yuba County • Complete the remaining major flood protection elements by 2008 • Web site: http://trlia.org

  3. Project Overview • Accelerated Flood Control Improvements • Goal: Complete by late 2008 • Four phased program underway – 29 miles • Approximately 50% done • Remaining work to be done in 2007 and 2008 • $133 Million spent to date • $78 Million Local Funding • $55 Million State Funding • Over $200 Million for remaining work • Feather River Setback drives high cost • Potential Proposition 1E or 84 funding

  4. TRLIA Levee Work by Phase • Phase 1 (red): Yuba • Phase 2 (green): Yuba, Western Pacific Interceptor Canal, and Bear • Phase 3 (purple): Bear Setback • Phase 4 (blue): Yuba, and Feather River

  5. Bear River Setback

  6. Bear River 639 acres of new riparian and upland habitats

  7. Feather Setback Benefits • Superior flood protection for South Yuba County • Built to current engineering standards • Built with suitable soils(current levee soil is too sandy) • Removes river choke point and widens floodway • Built away from old river channels • Eliminates significant erosion sites • Regional flood protection benefits for south Yuba County and surrounding communities • Widens flood way and lowers water surface levels (1.5 ft for Marysville and Yuba City) • No downstream impacts due to regulated flows • Creates up to 1550 acres of habitat for restoration or mitigation banking

  8. TRLIA/Yuba County Interface • Flood Plain Management • FEMA • Levee Certification • Underway

  9. Questions

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