Three Rivers Levee Improvement Authority (TRLIA)

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

March , 2007

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

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

•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

TRLIA Levee Work by Phase

Bear River Setback

Bear River 639 acres of new riparian and

upland habitats

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

• Flood Plain Management

• FEMA

• Levee Certification

Underway

TRLIA/Yuba County Interface

Questions