Three Rivers Levee Improvement Authority TRLIA

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Three Rivers Levee Improvement Authority (TRLIA)

Briefer Mary Jane Griego, TRLIA Board Member
Three Rivers Levee Improvement Authority
March , 2007
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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

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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

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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

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Bear River Setback

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Bear River 639 acres of new riparian and upland
habitats
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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

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TRLIA/Yuba County Interface

• Flood Plain Management
• FEMA
• Levee Certification
• Underway

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Questions