• Following a high water event in 2006, levee sites near highway 80 and the Yolo Bypass began to slump, essentially sinking into the foundation beneath it. The U.S. Army Corps of Engineers recently completed repairs on the second of those two sites, adding a gravel drain and reconstructing a 2,000-foot stretch of levee. The Corps completed a similar 400-foot levee piece in 2009 as part of the West Sacramento Project, a joint effort with the West Sacramento Area Flood Control Agency and the Central Valley Flood Protection Board to improve the levees surrounding West Sacramento. (U.S. Army Photo by Tyler Stalker/Released)

    Corps of Engineers completes levee repairs

    Following a high water event in 2006, levee sites near highway 80 and the Yolo Bypass began to slump, essentially sinking into the foundation beneath it. The U.S. Army Corps of Engineers recently completed repairs on the second of those two sites...

  • The U.S. Army Corps of Engineers Sacramento District repaired a 2,000-foot stretch of slumping levee separating highway 80 from the Yolo Bypass, adding a gravel drain to help eliminate moisture that was weakening the levee's foundation. The levee has been seeded and will be monitored until grasses, planted to help prevent erosion, begin to fill in. The repair work was completed as part of the West Sacramento Project, a joint effort with the West Sacramento Area Flood Control Agency and the Central Valley Flood Protection Board to improve the levees surrounding West Sacramento. (U.S. Army Photo by Tyler Stalker/Released)

    Corps of Engineers completes levee repairs

    The U.S. Army Corps of Engineers Sacramento District repaired a 2,000-foot stretch of slumping levee separating highway 80 from the Yolo Bypass, adding a gravel drain to help eliminate moisture that was weakening the levee's foundation. The levee has...

  • Completed in 2009, the U.S. Army Corps of Engineers rebuilt and added rip rap, or large rock, to the waterside banks of a 400-foot stretch of levee near the Yolo Bypass to address issues with slumping. The repair work was completed as part of the West Sacramento Project, a joint effort with the West Sacramento Area Flood Control Agency and the Central Valley Flood Protection Board to improve the levees surrounding West Sacramento. (U.S. Army Photo by Tyler Stalker/Released)

    Corps of Engineers completes levee repairs

    Completed in 2009, the U.S. Army Corps of Engineers rebuilt and added rip rap, or large rock, to the waterside banks of a 400-foot stretch of levee near the Yolo Bypass to address issues with slumping. The repair work was completed as part of the West...

WEST SACRAMENTO, Calif. -- West Sacramento levees are no longer sinking as the U.S. Army Corps of Engineers Sacramento District wraps up repairs on nearly a mile of levees near the Yolo Bypass.

The repairs are part of the Corps' West Sacramento Project, a joint effort with the West Sacramento Area Flood Control Agency and the Central Valley Flood Protection Board to improve the levees surrounding West Sacramento.

Signs of slumping, or sinking, became increasingly evident since high water saturated the levees in 2006.

The problem was a high water table, said Greg Sokolis, quality assurance representative. A high water table means the underground water is very close to the surface. In this case, it was within approximately five feet of the existing landside levee.

The Corps began necessary repairs on 2,000 feet of levee in July 2011 to restore its full flood risk reduction capability. After excavating the landside of the levee, construction crews installed a gravel drainage system in the toe, or bottom, of the levee, replacing the compacted soil before rebuilding the levee.

"The significant moisture of the high water table caused the landside levee to slump because it no longer had a solid foundation," said Sokolis.

The solution was a gravel drain. The drain, along with a system of pumps, will funnel water seeping into the levee directly into the bypass. With the new gravel drain in place, high groundwater should no longer be a problem.

"Installing the drain will help dry out the levee foundation, so there will not be moisture to cause additional slumping in the future," said Sokolis.

The site has also been seeded with native grasses to help prevent erosion and will be monitored until the grass grows in.

This was the second levee site along the Yolo Bypass the district has repaired in recent years.

In 2009, the Corps repaired slumping along approximately a 400-foot stretch of levee just south of the current site.

"These levees were approaching a level where they could no longer do their job," said Beth Henderson, project manager. "Now they're ready to continue reducing the flood risk for West Sacramento."

Page last updated Mon January 30th, 2012 at 00:00