The Marysville ring levee project started in 2010. Now, the U.S. Army Corps of Engineers is nearing completion of the project. Engineers are submitting for federal certification. … By federal standards, the project is done. FEMA requires a one-in-100-year level of protection. But the state of California requires a 200-year level protection. … ”I think it’s especially important for Marysville because it’s at the confluence of two major rivers, Feather River and Yuba River, which has been the focal point of devastating floods over the last century or so,” said Ryan McNally, the director of water resources and flood risk reduction with Yuba Water Agency.