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Protecting lives, infrastructure, and economic stability – the Marysville Ring Levee Project reduces flood risk for 12,700+ residents, major transportation routes, and critical regional services.
The Yuba River Basin has experienced seven major floods since 1940, with catastrophic events in 1986 and 1997 causing damages of $95 million and $82.4 million, respectively. Despite past modifications to reduce flood risk, the City of Marysville remains vulnerable due to the region’s levee system. The Marysville Ring Levee (MRL) protects over 12,700 residents, 3,731 structures—including the region’s only level-3 trauma center at Rideout Memorial Hospital—and critical transportation infrastructure such as State Highways 70 and 20 and the Union Pacific Railroad. Without improvements, the levee system remains at risk of failure due to through- and under-seepage, threatening lives, property, and economic stability.
The Marysville Ring Levee project is a multi-phase effort to strengthen 7.6 miles of levee surrounding the city. The project includes constructing seepage cutoff walls and berms using open trench and deep soil mixing methods to meet the state’s 200-year urban flood risk requirement. The U.S. Army Corps of Engineers (USACE) Sacramento District is leading the project in partnership with the California Central Valley Flood Protection Board (CVFPB) and the Marysville Levee District (MLD). The estimated $92.5 million project is federally and state-funded, with California contributing $17 million as part of its broader levee system upgrades. Upon completion of each phase, USACE updates the levee’s Operations & Maintenance (O&M) Manual, and MLD assumes responsibility for ongoing maintenance.
The Marysville Ring Levee project has been progressing in multiple phases, with significant milestones completed, including:
These upgrades have significantly enhanced the flood protection capabilities of Marysville, reducing risk and improving long-term resilience.
The project is nearing full completion, with the final construction efforts underway:
The project is expected to meet and exceed the flood protection criteria set by the state, making Marysville one of the safest urban areas in California’s Central Valley in terms of flood risk reduction.
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Final Supplemental EA-IS for Phases 2B and 3 Utility Relocation - July 2021
Finding of No Significant Impact (FONSI) for Phases 2B and 3 Utility Relocation - July 2021
Final Supplemental EA-IS for Phases 2B and 3 - June 2019
Finding of No Significant Impact (FONSI) for Phases 2B and 3 - June 2019
Notice of Determination for Phases 2B and 3 - July 2019
Draft Supplemental EA for Phases 2B and 3 - March 2019
Draft Mitigated Negative Declaration for Phases 2B and 3 - March 2019
Final EA - April 2010
Final Supplemental EA - Feb. 2018
Mitigated Negative Declaration - Feb. 2018
Supplemental EA / Initial Study for Phase 2A South Phase 2C - April 2018
Historic Structure Impact Report
An historic structures impact report assessing possible construction-related vibration effects to the National Register of Historic Places-eligible Marysville Historic Commercial District in Marysville, Calif.
Monitoring Plan
Appendix
An historic structures impact report assessing possible construction-related vibration effects to the National Register of Historic Places-listed Bok Kai Temple in Marysville, Calif.
12/15/2020 This meeting was held to provide an update on design refinements made to the utility relocation along Phases 2B and 3 of the Marysville Ring Levee project. Utilities were anticipated to be relocated in 2021. Public comments on the Draft Supplemental EA-IS were due January 10, 2021.
Webinar Presentation Slides Map: Phase 2B/3 Utility Relocation Locations Draft Notice of Intent (NOI) Draft Supplemental EA-IS Draft Finding of No Significant Impact (FONSI) Draft Supplemental Mitigated Negative Declaration To All Interested Parties Letter