Project Description
Portions of the Staten Island levee system along the North Mokelumne River are below the Delta Specific PL 84-99 Standard, which requires levee crown elevations to be 1.5 feet above the 100-year flood elevation. Additionally, seven levee sections along the North Mokelumne River are experiencing waterside erosion below the normal waterline. The project includes 16,000 LF of landside levee rehabilitation and 6,125 LF of waterside habitat enhancement above Mean High Water (MHW) from Sta. 1040+00 – 1200+00.
Project Scope
The landside work involves raising the levee crown and stabilizing the landside slope through the construction of a counterbalance berm. Levee sections experiencing erosion below the normal water line will be setback to restore the waterside geometry. Aggregate base material will also be placed on the levee crown to create an all-weather roadway.The waterside work includes excavation of the existing waterside slope at the seven setback levees to construct a habitat bench above MHW. The habitat bench and setback levee waterside slope will be planted with native species, which will be monitored and maintained for 3 years to ensure the success criteria are met.The key objectives of the project are to bring the levee system up to the Delta Specific PL 84-99 Standard, address the waterside erosion, and enhance the habitat along the North Mokelumne River.
