King County Water and Land Resources Division (WLRD) developed preliminary design for restoring approximately 50 acres of floodplain habitat on the left bank and floodplain of the Cedar River between River Mile 6.5 and 7.5. The project site encompasses Cavanaugh Pond Natural Area, administered by King County Parks and the previous site of the Riverbend Mobile Home and RV Park, which King County purchased in 2013. The project goals are to: 1. Restore riverine processes and function in the Cedar River and its floodplain in order to improve the quality, quantity, and sustainability of salmonid spawning and rearing habitat. 2. Reduce flood and erosion risks to people, property, and infrastructure; 3. Accommodate public use consistent with future ecological conditions at the site; and 4. Balance flood and ecological benefits and other objectives with project costs. WLRD evaluated seven alternatives for their ability to meet the project goals and objectives, using project effectiveness scoring criteria under the categories of salmon habitat, flood risk reduction, recreational benefit and cost effectiveness. The results of this alternatives analysis are documented in the Alternatives analysis Report, available in PRISM. Risks related to the project were identified during the planning, data collection, and early design efforts, and included erosion of adjacent banks and associated instability; regulatory and stakeholder resistance to the modification of Cavanaugh Pond; funding uncertainty; and uncertainty inherent in the political decision-making process. Alternative 1 ranked the highest in all categories due to its larger-scale, process-based approach. It provided the greatest opportunity to restore river functions by maximizing space available for channel migration, flood conveyance, and habitat formation by removing the conflicting uses and minimizing the reliance upon engineered connections. It also provided the most sustainable, long-term benefits. Though Alternative 1 was preferred based on scoring, Alternative 4 was the preferred option when cost and land acquisition feasibility are also taken into consideration. Alternative 4 can also be considered the first phase of the more comprehensive restoration approach -- recommended in alternative 1. Using a phased approach will still provide significant benefits in the near term and will leave the door open to future expansion as funding becomes available and land acquisitions develop. At 30% design, Alternative 4 is expected to remove 2,800 lineal feet of revetment; construct 1,650 lineal feet of new revetment as boundary protection; remove approximately 180,000 cubic yards (cy) of floodplain fill (fill Cavanaugh Pond or other areas with 130,000 cy; export 50,000 cy); construct approximately 5,600 lineal feet of side channel; place 650 pieces of large wood to provide floodplain roughness; plant 28 acres of the site.