Yuba River Levee Improvements (2004 – 2008)
Upper Yuba River Levee – Phase 1 (2004)
Serious seepage issues in the Upper Yuba River levee between Highway 70 and the Southern Pacific Railroad were identified in early 2004. That same summer, a fast-track project was implemented to construct a 2,200 foot-long slurry cutoff wall on the left bank of the Yuba River. The average depth of the slurry wall is 50 feet. The work was completed in November 2004. This was the first of several projects in this area to correct deficiencies that included seepage, slope geometry and levee height.
Upper Yuba River Levee – Phase 2 (2005)
Phase 2 involved the construction of a 90 to 300-foot wide seepage berm to protect against underseepage at the 1986 levee failure location. The work was completed in 2005.
Upper Yuba River Levee – Phase 4 (2006)
In 2006, a 6,850 foot-long slurry wall was installed in the left bank levee of the Upper Yuba River between the Union Pacific Railroad and Simpson Lane. The average depth of the slurry wall is 80 feet. The height of the levee was also increased in several spots along the same stretch to match the existing grade or the 1957 US Army Corps of Engineers’ design profile. Additionally, a seepage berm was constructed. The work was completed in 2006.
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