Project: American River Common Features 96/99
What does it do? The Common Featurers Project was designed to strengthen the American River levees so they can safely pass a flow of 160,000 cubic feet per second(cfs).
Features: The Common Features Project has installed roughly 24 miles of slurry wall up to depths of 80-feet, raised levees to provide adequate freeboard, addressed slope stability issues and corrected some erosion problems.
Construction Schedule: The majority of levee work along the American River has been completed. There are several reaches of levee that need some work and the work schedule for those pieces are as follows:
Mayhew Levee Upstream of the Mayhew Drain: Work is essentially complete on the Mayhew levee which received levee certfication and insurance relief in December of 2010. There is still some work left to do including the restoration of the staging area, some bank stabilization and the Levee Tie-In at the eastern end of the project.
North Levee Upstream of Watt Ave (Jacobs Lane): A portion of this project was completed in 2008, with the completed in 2010. The work consists of reshaping the levee in spots and increasing the height of the levee up to a foot.
"Remaining Sites": January 2011- There are approximately 18 locations in the levee that do not have a slurrywall in them due to conflict with existing infrastructure. While the levee can safely withstand the 100-year event it may not be able to protect against the design flow of 160,000 cfs. These sites are being evaluated to see if remediation is required.
All Remaining
Sites |
|
Mayhew Levee
Staging Area
|
The Corps has awarded a contract to resore the area used as a staging area for the Mayhew Levee Improvement Project. Work will begin Fall 2011. |
| R-5 Slurry Wall |
The Corps has awarded a construction contract to close the gap in the slurry wall where a large sewer line crosses the levee. The site is located downstream of the Campus Commons Golf Course. Work at this site is currently under construction (Sept 2011). Please click here to see a photo of the construction activity. |
| Site L-12: |
College Glen Drainage Outfall - Work is currently underway (Oct. 2010) and the job should be completed by Dec. 2012. A slurry wall is being constructed that will connect upstream and downstream of the pump station. |
| Guy West Bridge : |
Work occured over the summer of 2010 to close the gaps in the slurry wall that remained as a result of construction in 2002-2003 timeframe. This work was needed because at the time of the original construction it was decided that a separate contract was needed and special equipment was required to work around the bridge. There was also a tight time window to construct the improvements without affecting normal access to the University. |
Mayhew
Levee
Staging
Area |
The Corps has awarded a contract to restore the area used as a staging area for the Mayhew Levee Improvement Project. Work will begin either in late fall 2010 or early 2011. |
R-6
Slurry
Wall
|
The Corps has awarded a construction contract to close the gap in the slurry wall where a large sewer line crosses the levee. The site is located downstream of the Campus Commons Golf Course. Work at this site is expected be begin in the Spring of 2011. |
Cost: Current Authorization is $250 million for the overall Project.
Project: Common Features General Re-evaluation Report (GRR)
What does it do? The GRR will investigate the flood protection system along the American River, Natomas, the east side of the Sacramento River, and the levees in North Sacramento to identify what improvements are needed to bring the system up to a 200-year standard.
Features: The study will look at options in meeting the 200-year standard.
Construction Schedule: The GRR is planned for completion in 2014. Construction associated with the report will start approximately a year after adoption of the report by Congress.
Cost: Unknown at this time but will be developed as part of the GRR.
May 2009 Environmental Document
Draft Environmental Assessment Initial Study American River Common Features - Phase 1
April 21, 2010 - U.S. Army Corps of Engineers - Follow up Letter
