The project is to repair a damaged section of streambank along Ellwood Creek. In 2018 storm flows toppled a large coast live oak (Quercus agrifolia) resulting in a 76-foot-long scour hole along the streambank. To stop the erosion from continuing, an initial layer of native rock slope protection (RSP) was placed in a footing trench and
keyed in for stability, then built up 10 feet high along the 76-foot-wide opening of the bank where erosion occurred. This work was stopped when Permittee was informed of the need to submit a notification to CDFW. Additional bank protection to protect a remaining oak tree with exposed roots was permitted through Emergency Notification
#SBA-16142 Ellwood Canyon Ranch Ellwood Creek Repair. To complete the project, Permittee proposes to place additional native RSP above of the existing RSP at a 1.5:1 slope to raise the bank another 7.5 feet making the height of the bank consistent with the height of the banks at both ends of the scour hole. The remaining void from
the scour hole will be filled in layers with native soil and native rock. The area immediately behind the RSP will be filled with a gravel matrix to act as a gravel filter. The final surface layer of the filled in void will be planted with locally native vegetation to further stabilize the creek bank and provide habitat for wildlife in accordance with a
restoration plan approved by all agencies. In all, approximately 267 tons of native rock will be installed, and 2,469 cubic yards of native soil will be used as fill. Equipment used to complete this project will include excavators, bobcat, dump truck, backhoe, and hand tools during native riparian plant restoration activities.